diff --git a/common_tools/git/cherry-pick-commits.py b/common_tools/git/cherry-pick-commits.py
index e3a3f2a6c..c45ec0bf0 100755
--- a/common_tools/git/cherry-pick-commits.py
+++ b/common_tools/git/cherry-pick-commits.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # @HEADER
 # ************************************************************************
 #
diff --git a/common_tools/git/commit-summary-over-periods.py b/common_tools/git/commit-summary-over-periods.py
index be5dd8aea..8d5a3fe1b 100755
--- a/common_tools/git/commit-summary-over-periods.py
+++ b/common_tools/git/commit-summary-over-periods.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # @HEADER
 # ************************************************************************
 #
diff --git a/common_tools/git/hooks/server-side/get_recipients.py b/common_tools/git/hooks/server-side/get_recipients.py
index 52274fea1..fbe2976ff 100755
--- a/common_tools/git/hooks/server-side/get_recipients.py
+++ b/common_tools/git/hooks/server-side/get_recipients.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import commands
 import os
diff --git a/common_tools/git/hooks/server-side/update_push_log.py b/common_tools/git/hooks/server-side/update_push_log.py
index d7fa52602..8ddfc8f9e 100755
--- a/common_tools/git/hooks/server-side/update_push_log.py
+++ b/common_tools/git/hooks/server-side/update_push_log.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # @HEADER
 # ************************************************************************
 #
diff --git a/common_tools/test/hhmmss_math.py b/common_tools/test/hhmmss_math.py
index 81dce2d91..a954b12cd 100644
--- a/common_tools/test/hhmmss_math.py
+++ b/common_tools/test/hhmmss_math.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # This simple set of python functions makes it easy to do simple math with
 # times formatted as <hr>h<min>m<sec>s.  This makes it easier to analyze
diff --git a/common_tools/test/kill-pstree.py b/common_tools/test/kill-pstree.py
index 4fc93e9d3..3d35eedf9 100755
--- a/common_tools/test/kill-pstree.py
+++ b/common_tools/test/kill-pstree.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # @HEADER
 # ************************************************************************
 #
diff --git a/refactoring/remove_std_tribits_includes.py b/refactoring/remove_std_tribits_includes.py
index 29dcea3f9..5c5cba3f7 100755
--- a/refactoring/remove_std_tribits_includes.py
+++ b/refactoring/remove_std_tribits_includes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 include_files_to_remove = [
   "AddSubdirectories",
diff --git a/tribits/doc/guides/TribitsGuidesBody.rst b/tribits/doc/guides/TribitsGuidesBody.rst
index 18507eddb..29a319fc6 100644
--- a/tribits/doc/guides/TribitsGuidesBody.rst
+++ b/tribits/doc/guides/TribitsGuidesBody.rst
@@ -4233,7 +4233,8 @@ repositories if specified).  There are several python tools under
 ``tribits/ci_support/`` that read in this file and use the created
 data-structure for various tasks.  This file and these tools are used by
 `checkin-test.py`_ and `tribits_ctest_driver()`_.  But these tools can also be
-used to construct other workflows and tools.
+used to construct other workflows and tools.  These tools require a Python3
+installation and for the `python3` executable to be installed.
 
 .. _TribitsDumpDepsXmlScript.cmake: