diff --git a/tests/testcases/basic.py b/tests/testcases/basic.py
index d0ecaf10..78a6136d 100755
--- a/tests/testcases/basic.py
+++ b/tests/testcases/basic.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/clear_shadow_unredirected.py b/tests/testcases/clear_shadow_unredirected.py
index 4a9f5313..360a5223 100755
--- a/tests/testcases/clear_shadow_unredirected.py
+++ b/tests/testcases/clear_shadow_unredirected.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue239.py b/tests/testcases/issue239.py
index fe3f6364..3b5b058b 100755
--- a/tests/testcases/issue239.py
+++ b/tests/testcases/issue239.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue239_2.py b/tests/testcases/issue239_2.py
index 54f5412c..6ce7cf78 100755
--- a/tests/testcases/issue239_2.py
+++ b/tests/testcases/issue239_2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue239_3.py b/tests/testcases/issue239_3.py
index 3bc96611..41d58c45 100755
--- a/tests/testcases/issue239_3.py
+++ b/tests/testcases/issue239_3.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue239_3_norefresh.py b/tests/testcases/issue239_3_norefresh.py
index edcf1c23..f87e2dac 100755
--- a/tests/testcases/issue239_3_norefresh.py
+++ b/tests/testcases/issue239_3_norefresh.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue314.py b/tests/testcases/issue314.py
index ee29fc49..d10b9533 100755
--- a/tests/testcases/issue314.py
+++ b/tests/testcases/issue314.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue314_2.py b/tests/testcases/issue314_2.py
index c19d6cd5..3fd95796 100755
--- a/tests/testcases/issue314_2.py
+++ b/tests/testcases/issue314_2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue314_3.py b/tests/testcases/issue314_3.py
index 9d4ee3a2..0fb18809 100755
--- a/tests/testcases/issue314_3.py
+++ b/tests/testcases/issue314_3.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue357.py b/tests/testcases/issue357.py
index 9f95a4dc..cd74c8ca 100755
--- a/tests/testcases/issue357.py
+++ b/tests/testcases/issue357.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue394.py b/tests/testcases/issue394.py
index 3bc4877a..e0918ef9 100755
--- a/tests/testcases/issue394.py
+++ b/tests/testcases/issue394.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue465.py b/tests/testcases/issue465.py
index 588be91f..fc33a6de 100755
--- a/tests/testcases/issue465.py
+++ b/tests/testcases/issue465.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/issue525.py b/tests/testcases/issue525.py
index 317e3088..50dd32c6 100755
--- a/tests/testcases/issue525.py
+++ b/tests/testcases/issue525.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib
diff --git a/tests/testcases/redirect_when_unmapped_window_has_shadow.py b/tests/testcases/redirect_when_unmapped_window_has_shadow.py
index aeceb33c..74883407 100755
--- a/tests/testcases/redirect_when_unmapped_window_has_shadow.py
+++ b/tests/testcases/redirect_when_unmapped_window_has_shadow.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import xcffib.xproto as xproto
 import xcffib