diff --git a/tests/topotests/all-protocol-startup/test_all_protocol_startup.py b/tests/topotests/all-protocol-startup/test_all_protocol_startup.py
index 239de55..3e7fc07 100755
--- a/tests/topotests/all-protocol-startup/test_all_protocol_startup.py
+++ b/tests/topotests/all-protocol-startup/test_all_protocol_startup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_all_protocol_startup.py
diff --git a/tests/topotests/bfd-topo1/test_bfd_topo1.py b/tests/topotests/bfd-topo1/test_bfd_topo1.py
index 4fd4f97..192f44c 100644
--- a/tests/topotests/bfd-topo1/test_bfd_topo1.py
+++ b/tests/topotests/bfd-topo1/test_bfd_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bfd_topo1.py
diff --git a/tests/topotests/bfd-topo2/test_bfd_topo2.py b/tests/topotests/bfd-topo2/test_bfd_topo2.py
index 773db12..140ceee 100644
--- a/tests/topotests/bfd-topo2/test_bfd_topo2.py
+++ b/tests/topotests/bfd-topo2/test_bfd_topo2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bfd_topo2.py
diff --git a/tests/topotests/bgp-ecmp-topo1/peer1/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer1/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer1/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer1/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer1/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer1/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer1/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer1/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer10/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer10/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer10/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer10/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer10/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer10/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer10/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer10/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer11/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer11/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer11/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer11/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer11/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer11/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer11/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer11/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer12/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer12/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer12/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer12/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer12/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer12/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer12/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer12/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer13/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer13/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer13/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer13/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer13/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer13/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer13/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer13/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer14/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer14/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer14/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer14/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer14/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer14/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer14/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer14/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer15/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer15/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer15/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer15/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer15/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer15/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer15/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer15/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer16/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer16/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer16/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer16/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer16/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer16/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer16/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer16/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer17/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer17/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer17/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer17/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer17/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer17/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer17/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer17/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer18/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer18/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer18/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer18/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer18/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer18/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer18/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer18/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer19/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer19/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer19/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer19/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer19/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer19/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer19/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer19/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer2/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer2/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer2/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer2/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer2/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer2/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer2/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer2/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer20/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer20/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer20/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer20/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer20/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer20/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer20/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer20/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer3/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer3/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer3/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer3/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer3/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer3/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer3/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer3/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer4/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer4/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer4/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer4/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer4/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer4/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer4/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer4/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer5/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer5/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer5/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer5/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer5/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer5/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer5/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer5/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer6/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer6/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer6/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer6/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer6/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer6/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer6/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer6/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer7/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer7/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer7/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer7/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer7/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer7/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer7/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer7/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer8/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer8/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer8/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer8/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer8/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer8/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer8/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer8/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/peer9/exa-receive.py b/tests/topotests/bgp-ecmp-topo1/peer9/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer9/exa-receive.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer9/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp-ecmp-topo1/peer9/exa-send.py b/tests/topotests/bgp-ecmp-topo1/peer9/exa-send.py
index 647c254..dd2e43c 100755
--- a/tests/topotests/bgp-ecmp-topo1/peer9/exa-send.py
+++ b/tests/topotests/bgp-ecmp-topo1/peer9/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp-ecmp-topo1/test_bgp_ecmp_topo1.py b/tests/topotests/bgp-ecmp-topo1/test_bgp_ecmp_topo1.py
index d806226..9e3167c 100755
--- a/tests/topotests/bgp-ecmp-topo1/test_bgp_ecmp_topo1.py
+++ b/tests/topotests/bgp-ecmp-topo1/test_bgp_ecmp_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp_ecmp_topo1.py
diff --git a/tests/topotests/bgp-vrf-route-leak-basic/test_bgp.py b/tests/topotests/bgp-vrf-route-leak-basic/test_bgp.py
index b0d6040..695c15c 100755
--- a/tests/topotests/bgp-vrf-route-leak-basic/test_bgp.py
+++ b/tests/topotests/bgp-vrf-route-leak-basic/test_bgp.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp.py
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py b/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
index b464905..e14cc8d 100644
--- a/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py b/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
index f710c84..3cc7a1f 100755
--- a/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py b/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
index ce54241..7ad82e1 100644
--- a/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py b/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
index 1da1066..7c35892 100755
--- a/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py b/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
index da4b67b..b06515a 100644
--- a/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
+++ b/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # bgp_local_as_private_remove.py
diff --git a/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py b/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
index 69b8c7c..1955176 100644
--- a/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
+++ b/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # bgp_local_as_private_remove.py
diff --git a/tests/topotests/bgp_multiview_topo1/peer1/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer1/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer1/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer1/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer1/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer1/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer1/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer1/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer2/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer2/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer2/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer2/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer2/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer2/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer2/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer2/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer3/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer3/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer3/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer3/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer3/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer3/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer3/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer3/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer4/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer4/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer4/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer4/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer4/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer4/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer4/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer4/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer5/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer5/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer5/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer5/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer5/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer5/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer5/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer5/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer6/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer6/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer6/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer6/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer6/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer6/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer6/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer6/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer7/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer7/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer7/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer7/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer7/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer7/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer7/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer7/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/peer8/exa-receive.py b/tests/topotests/bgp_multiview_topo1/peer8/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_multiview_topo1/peer8/exa-receive.py
+++ b/tests/topotests/bgp_multiview_topo1/peer8/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_multiview_topo1/peer8/exa-send.py b/tests/topotests/bgp_multiview_topo1/peer8/exa-send.py
index 2de2bce..797da15 100755
--- a/tests/topotests/bgp_multiview_topo1/peer8/exa-send.py
+++ b/tests/topotests/bgp_multiview_topo1/peer8/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py b/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
index 7607fe9..0030954 100755
--- a/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
+++ b/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp_multiview_topo1.py
diff --git a/tests/topotests/bgp_rfapi_basic_sanity/customize.py b/tests/topotests/bgp_rfapi_basic_sanity/customize.py
index a125c65..c385fc3 100644
--- a/tests/topotests/bgp_rfapi_basic_sanity/customize.py
+++ b/tests/topotests/bgp_rfapi_basic_sanity/customize.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py b/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
index 0e1f236..7ec7dbb 100755
--- a/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
+++ b/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/bgp_show_ip_bgp_fqdn/test_bgp_show_ip_bgp_fqdn.py b/tests/topotests/bgp_show_ip_bgp_fqdn/test_bgp_show_ip_bgp_fqdn.py
index 59ffd36..2628be9 100644
--- a/tests/topotests/bgp_show_ip_bgp_fqdn/test_bgp_show_ip_bgp_fqdn.py
+++ b/tests/topotests/bgp_show_ip_bgp_fqdn/test_bgp_show_ip_bgp_fqdn.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp_show_ip_bgp_fqdn.py
diff --git a/tests/topotests/bgp_vrf_netns/peer1/exa-receive.py b/tests/topotests/bgp_vrf_netns/peer1/exa-receive.py
index 5334ea5..f310eee 100755
--- a/tests/topotests/bgp_vrf_netns/peer1/exa-receive.py
+++ b/tests/topotests/bgp_vrf_netns/peer1/exa-receive.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-receive.py: Save received routes form ExaBGP into file
diff --git a/tests/topotests/bgp_vrf_netns/peer1/exa-send.py b/tests/topotests/bgp_vrf_netns/peer1/exa-send.py
index 9a2a201..5c2b5c1 100755
--- a/tests/topotests/bgp_vrf_netns/peer1/exa-send.py
+++ b/tests/topotests/bgp_vrf_netns/peer1/exa-send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 exa-send.py: Send a few testroutes with ExaBGP
diff --git a/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py b/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
index a5590bc..3c69dca 100755
--- a/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
+++ b/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp_vrf_netns_topo1.py
diff --git a/tests/topotests/eigrp-topo1/test_eigrp_topo1.py b/tests/topotests/eigrp-topo1/test_eigrp_topo1.py
index 1c00fac..adc1731 100755
--- a/tests/topotests/eigrp-topo1/test_eigrp_topo1.py
+++ b/tests/topotests/eigrp-topo1/test_eigrp_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_eigrp_topo1.py
diff --git a/tests/topotests/example-test/test_example.py b/tests/topotests/example-test/test_example.py
index 8e37ad1..9637eb3 100755
--- a/tests/topotests/example-test/test_example.py
+++ b/tests/topotests/example-test/test_example.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import subprocess
 import sys
diff --git a/tests/topotests/example-test/test_template.py b/tests/topotests/example-test/test_template.py
index 4e35ce8..6a0d298 100755
--- a/tests/topotests/example-test/test_template.py
+++ b/tests/topotests/example-test/test_template.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # <template>.py
diff --git a/tests/topotests/isis-topo1/test_isis_topo1.py b/tests/topotests/isis-topo1/test_isis_topo1.py
index 941f917..ac46ca9 100644
--- a/tests/topotests/isis-topo1/test_isis_topo1.py
+++ b/tests/topotests/isis-topo1/test_isis_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_isis_topo1.py
diff --git a/tests/topotests/ldp-topo1/test_ldp_topo1.py b/tests/topotests/ldp-topo1/test_ldp_topo1.py
index 409a5f5..05ff950 100755
--- a/tests/topotests/ldp-topo1/test_ldp_topo1.py
+++ b/tests/topotests/ldp-topo1/test_ldp_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_bgp_multiview_topo1.py
diff --git a/tests/topotests/ldp-vpls-topo1/test_ldp_vpls_topo1.py b/tests/topotests/ldp-vpls-topo1/test_ldp_vpls_topo1.py
index 0948c2e..7ad5f53 100755
--- a/tests/topotests/ldp-vpls-topo1/test_ldp_vpls_topo1.py
+++ b/tests/topotests/ldp-vpls-topo1/test_ldp_vpls_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ldp_vpls_topo1.py
diff --git a/tests/topotests/lib/bgprib.py b/tests/topotests/lib/bgprib.py
index 5a81036..ac88978 100644
--- a/tests/topotests/lib/bgprib.py
+++ b/tests/topotests/lib/bgprib.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2018, LabN Consulting, L.L.C.
 #
diff --git a/tests/topotests/lib/ltemplate.py b/tests/topotests/lib/ltemplate.py
index 31eaec7..2ac6247 100644
--- a/tests/topotests/lib/ltemplate.py
+++ b/tests/topotests/lib/ltemplate.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # Part of NetDEF Topology Tests
diff --git a/tests/topotests/lib/lutil.py b/tests/topotests/lib/lutil.py
index 3ae1801..ad8a943 100755
--- a/tests/topotests/lib/lutil.py
+++ b/tests/topotests/lib/lutil.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017, LabN Consulting, L.L.C.
 #
diff --git a/tests/topotests/lib/test/test_json.py b/tests/topotests/lib/test/test_json.py
index 3927ba0..5f0cc00 100755
--- a/tests/topotests/lib/test/test_json.py
+++ b/tests/topotests/lib/test/test_json.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_json.py
diff --git a/tests/topotests/lib/test/test_version.py b/tests/topotests/lib/test/test_version.py
index 9204ac2..96f8d64 100755
--- a/tests/topotests/lib/test/test_version.py
+++ b/tests/topotests/lib/test/test_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_version.py
diff --git a/tests/topotests/lib/topotest.py b/tests/topotests/lib/topotest.py
index e0da20e..5ea270e 100644
--- a/tests/topotests/lib/topotest.py
+++ b/tests/topotests/lib/topotest.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # topotest.py
diff --git a/tests/topotests/lm-proxy-topo1/test_lm-proxy-topo1.py b/tests/topotests/lm-proxy-topo1/test_lm-proxy-topo1.py
index 7acbb1e..10c1e9b 100644
--- a/tests/topotests/lm-proxy-topo1/test_lm-proxy-topo1.py
+++ b/tests/topotests/lm-proxy-topo1/test_lm-proxy-topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_lm-proxy-topo1.py
diff --git a/tests/topotests/ospf-sr-topo1/test_ospf_sr_topo1.py b/tests/topotests/ospf-sr-topo1/test_ospf_sr_topo1.py
index 56cd42e..ebc5513 100755
--- a/tests/topotests/ospf-sr-topo1/test_ospf_sr_topo1.py
+++ b/tests/topotests/ospf-sr-topo1/test_ospf_sr_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ospf_sr_topo1.py
diff --git a/tests/topotests/ospf-topo1-vrf/test_ospf_topo1_vrf.py b/tests/topotests/ospf-topo1-vrf/test_ospf_topo1_vrf.py
index fc48544..18237a8 100755
--- a/tests/topotests/ospf-topo1-vrf/test_ospf_topo1_vrf.py
+++ b/tests/topotests/ospf-topo1-vrf/test_ospf_topo1_vrf.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ospf_topo1.py
diff --git a/tests/topotests/ospf-topo1/test_ospf_topo1.py b/tests/topotests/ospf-topo1/test_ospf_topo1.py
index 638e394..1a422a2 100755
--- a/tests/topotests/ospf-topo1/test_ospf_topo1.py
+++ b/tests/topotests/ospf-topo1/test_ospf_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ospf_topo1.py
diff --git a/tests/topotests/ospf6-topo1/test_ospf6_topo1.py b/tests/topotests/ospf6-topo1/test_ospf6_topo1.py
index 5da04b6..3dc7468 100755
--- a/tests/topotests/ospf6-topo1/test_ospf6_topo1.py
+++ b/tests/topotests/ospf6-topo1/test_ospf6_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ospf6_topo1.py
diff --git a/tests/topotests/pim-basic/mcast-rx.py b/tests/topotests/pim-basic/mcast-rx.py
index 9e3484e..0abd493 100755
--- a/tests/topotests/pim-basic/mcast-rx.py
+++ b/tests/topotests/pim-basic/mcast-rx.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # mcast-rx.py
 #
diff --git a/tests/topotests/pim-basic/mcast-tx.py b/tests/topotests/pim-basic/mcast-tx.py
index c469e47..a7c4b8b 100755
--- a/tests/topotests/pim-basic/mcast-tx.py
+++ b/tests/topotests/pim-basic/mcast-tx.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # mcast-tx.py
 #
diff --git a/tests/topotests/pim-basic/test_pim.py b/tests/topotests/pim-basic/test_pim.py
index 6d54b8f..73d36e9 100644
--- a/tests/topotests/pim-basic/test_pim.py
+++ b/tests/topotests/pim-basic/test_pim.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_pim.py
diff --git a/tests/topotests/rip-topo1/test_rip_topo1.py b/tests/topotests/rip-topo1/test_rip_topo1.py
index 7aaaaca..a6d6175 100755
--- a/tests/topotests/rip-topo1/test_rip_topo1.py
+++ b/tests/topotests/rip-topo1/test_rip_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_rip_topo1.py
diff --git a/tests/topotests/ripng-topo1/test_ripng_topo1.py b/tests/topotests/ripng-topo1/test_ripng_topo1.py
index 145b1a7..a19f047 100755
--- a/tests/topotests/ripng-topo1/test_ripng_topo1.py
+++ b/tests/topotests/ripng-topo1/test_ripng_topo1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # test_ripng_topo1.py
diff --git a/tools/fixup-deprecated.py b/tools/fixup-deprecated.py
index 3895848..7b104c2 100755
--- a/tools/fixup-deprecated.py
+++ b/tools/fixup-deprecated.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
 # Script used to replace deprecated quagga/frr mactors/types/etc.
diff --git a/tools/git-reindent-branch.py b/tools/git-reindent-branch.py
index c207f59..202cdfa 100644
--- a/tools/git-reindent-branch.py
+++ b/tools/git-reindent-branch.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 import sys, os
diff --git a/tools/indent.py b/tools/indent.py
index d2c41e1..d4fc2be 100755
--- a/tools/indent.py
+++ b/tools/indent.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # 2017 by David Lamparter, placed in public domain
 
diff --git a/tools/render_md.py b/tools/render_md.py
index 16c4bbe..28b6aa7 100644
--- a/tools/render_md.py
+++ b/tools/render_md.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # written 2016 by David Lamparter, placed in Public Domain.
 import sys, markdown