diff --git a/CondTools/SiStrip/scripts/SiStripDAQPopCon.py b/CondTools/SiStrip/scripts/SiStripDAQPopCon.py
index a24f93acc2c83..dc1222c1e533d 100755
--- a/CondTools/SiStrip/scripts/SiStripDAQPopCon.py
+++ b/CondTools/SiStrip/scripts/SiStripDAQPopCon.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 '''Script that runs a single O2O for SiStrip DAQ.
 @author: Huilin Qu
 '''
diff --git a/CondTools/SiStrip/scripts/SiStripDCSPopCon.py b/CondTools/SiStrip/scripts/SiStripDCSPopCon.py
index e7539129b3a55..66cf725650927 100755
--- a/CondTools/SiStrip/scripts/SiStripDCSPopCon.py
+++ b/CondTools/SiStrip/scripts/SiStripDCSPopCon.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 '''Script that runs SiStrip DCS O2O.
 @author: Huilin Qu
 '''
diff --git a/CondTools/SiStrip/scripts/o2oRun_SiStripDAQ.py b/CondTools/SiStrip/scripts/o2oRun_SiStripDAQ.py
index 86e2b1ca7c8f3..5f27fe812f36d 100755
--- a/CondTools/SiStrip/scripts/o2oRun_SiStripDAQ.py
+++ b/CondTools/SiStrip/scripts/o2oRun_SiStripDAQ.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 '''
 Main Script to run all SiStrip DAQ O2Os at the same time.
 @author: Huilin Qu
diff --git a/CondTools/SiStrip/scripts/o2oRun_SiStripDCS.py b/CondTools/SiStrip/scripts/o2oRun_SiStripDCS.py
index 7c4d57ffc43d7..a3a97bf19af89 100755
--- a/CondTools/SiStrip/scripts/o2oRun_SiStripDCS.py
+++ b/CondTools/SiStrip/scripts/o2oRun_SiStripDCS.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 '''
 Top level script to run SiStrip DCS O2O.
 @author: Huilin Qu