diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 23bddfb94b..7252365cd8 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -22,10 +22,12 @@ jobs:
         run: |
           pip install pipenv
           pipenv install -d
-          pipenv install -r test_requirements.txt
+          pipenv run pip install -r test_requirements.txt
+      - name: Check pytest installation
+        run: pipenv run pip show pytest
       - name: Run unit tests
         run: |
-          pipenv run python run_tests.py
+          pipenv run python3 run_tests.py
 
   # Frontend tests (VueJS)
   VueJS:
diff --git a/run_tests.py b/run_tests.py
index 7aa9f60148..1a7a3035a3 100755
--- a/run_tests.py
+++ b/run_tests.py
@@ -4,10 +4,7 @@
 
 
 def run_python_tests():
-    subprocess.check_call(
-        "python3 -m pytest timesketch/ api_client/",
-        shell=True,
-    )
+    subprocess.check_call(["python3", "-m", "pytest", "timesketch/", "api_client/"])
 
 
 def main():