diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3333ae..0ef7284 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,7 +2,12 @@ name: "CI"
 
 on:
   push:
-    branches: ["master"]
+    branches:
+        - master
+        - CI_testing
+  pull_request:
+    branches:
+        - master
 
 jobs:
   Linux:
diff --git a/build_python.sh b/build_python.sh
index bf39f81..5cbb1b1 100755
--- a/build_python.sh
+++ b/build_python.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if [ $# -lt 1 ]
 then
diff --git a/make_tarball.sh b/make_tarball.sh
index 6636b35..26331df 100755
--- a/make_tarball.sh
+++ b/make_tarball.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 cd openEMS
 GITREV=`git describe --tags`
diff --git a/update_openEMS.sh b/update_openEMS.sh
index 6f0414a..a190067 100755
--- a/update_openEMS.sh
+++ b/update_openEMS.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Compiling OpenEMS may require installing the following packages:
 # apt-get install cmake qt4-qmake libtinyxml-dev libcgal-dev libvtk5-qt4-dev