diff --git a/run_tests.sh b/run_tests.sh
index 82c42cc..d7f42ee 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -6,4 +6,4 @@ librarian_tests_dir="${librarian_dir}/librarian_tests"
 export PYTHONPATH="${librarian_dir}"
 cd "${librarian_tests_dir}"
 
-python -m unittest "$@" test_*.py
+python3 -m unittest "$@" test_*.py