diff --git a/.github/python/requirements.txt b/.github/python/requirements.txt
index ce5f1bb..89ac246 100644
--- a/.github/python/requirements.txt
+++ b/.github/python/requirements.txt
@@ -1,2 +1,6 @@
 -r ../../requirements.txt
 git+https://github.com/jakevdp/JSAnimation.git
+nbconvert==5.6.1
+# https://github.com/jupyter/nbgrader/issues/1373#issuecomment-702798246
+jupyter-client==6.1.12
+# https://github.com/jupyter/jupyter_client/issues/637