diff --git a/tests/requirements-testing.txt b/tests/requirements-testing.txt
index 63e56b3..1a6b794 100644
--- a/tests/requirements-testing.txt
+++ b/tests/requirements-testing.txt
@@ -1,4 +1,6 @@
 coverage==5.3
+# pin importlib-metadata as upper versions need typing-extensions to work if on python < 3.8
+importlib-metadata==3.1.0;python_version<"3.8"
 mypy==0.790
 pytest==6.1.2
 pytest-cov==2.10.1