diff --git a/install-tools b/install-tools
index fa2e28c..fa90ec3 100755
--- a/install-tools
+++ b/install-tools
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/make-appimage.py b/make-appimage.py
index 1a97cd2..9ab6a43 100755
--- a/make-appimage.py
+++ b/make-appimage.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/make-readme.py b/make-readme.py
index b074260..e2b0ec0 100755
--- a/make-readme.py
+++ b/make-readme.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
diff --git a/setup.py b/setup.py
index fcd3517..5b22be3 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/test_distributions.py b/test_distributions.py
index c745ea0..1cb8835 100755
--- a/test_distributions.py
+++ b/test_distributions.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/__main___test.py b/tests/__main___test.py
index a8b3486..e09049c 100755
--- a/tests/__main___test.py
+++ b/tests/__main___test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/fill3_test.py b/tests/fill3_test.py
index 9aa8314..5db5720 100755
--- a/tests/fill3_test.py
+++ b/tests/fill3_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
diff --git a/tests/gut_test.py b/tests/gut_test.py
index 82155f3..ea59d68 100755
--- a/tests/gut_test.py
+++ b/tests/gut_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/lscolors_test.py b/tests/lscolors_test.py
index a7ef729..6b61f2b 100755
--- a/tests/lscolors_test.py
+++ b/tests/lscolors_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2011, 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/termstr_test.py b/tests/termstr_test.py
index 662e4f5..4f46af5 100755
--- a/tests/termstr_test.py
+++ b/tests/termstr_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/tools_test.py b/tests/tools_test.py
index bf1573d..305b11b 100755
--- a/tests/tools_test.py
+++ b/tests/tools_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/tests/worker_test.py b/tests/worker_test.py
index 3a3e9cd..b3ef691 100755
--- a/tests/worker_test.py
+++ b/tests/worker_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/vigil/__main__.py b/vigil/__main__.py
index 95f85d5..35666c2 100755
--- a/vigil/__main__.py
+++ b/vigil/__main__.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
diff --git a/vigil/gut.py b/vigil/gut.py
index 090666e..fd68fcc 100755
--- a/vigil/gut.py
+++ b/vigil/gut.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.
diff --git a/vigil/worker.py b/vigil/worker.py
index 9bd3f9e..a4dc310 100755
--- a/vigil/worker.py
+++ b/vigil/worker.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.5
 
 # Copyright (C) 2015-2017 Andrew Hamilton. All rights reserved.
 # Licensed under the Artistic License 2.0.