diff --git a/templates/tools/dockerfile/run_tests_python_deps_pep668.include b/templates/tools/dockerfile/run_tests_python_deps_pep668.include
index bbc74ec627933..53ee721c47ba2 100644
--- a/templates/tools/dockerfile/run_tests_python_deps_pep668.include
+++ b/templates/tools/dockerfile/run_tests_python_deps_pep668.include
@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y ${'\\'}
   python3-pip ${'\\'}
   python3-setuptools ${'\\'}
   python3-yaml ${'\\'}
+  python3-mako ${'\\'}
   && apt-get clean
 
 # use pinned version of pip to avoid sudden breakages