diff --git a/environment.yml b/environment.yml
index 5cac73d9fbf2ab4328f5b6cd6fc9020d3d400a01..3e54c4a4b75c9ba6015949763962c1b3a6cdc840 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,7 +2,6 @@ name: training_cpp_2021
 channels:
   - conda-forge
 dependencies:
-  - python>=3.8
-  - jupyterlab
-  - xeus-cling 
-  
\ No newline at end of file
+  - notebook
+  - xeus-cling=0.13.0
+  - gcc=9.4.0
\ No newline at end of file