diff --git a/environment.yml b/environment.yml
index d45c0dd75dfa186e3745d927b96eebcc0a93aed6..413a2ad6f20437bd42a047f4f071ddca00e0b9a1 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,5 +3,6 @@ channels:
   - conda-forge
 dependencies:
   - notebook
+  - jupyter_contrib_nbextensions
   - xeus-cling=0.13.0
-  - gcc=9.4.0
\ No newline at end of file
+  - gcc=9.4.0