diff --git a/requirements.txt b/requirements.txt
index 729aa4e..c515ec7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+click==8.0.2  # https://stackoverflow.com/a/71674345/595220
 flake8==3.8.4
 pytest==6.1.2
 pytest-asyncio==0.14.0