diff --git a/docker/env.yaml b/docker/env.yaml
index a3776e6..58babce 100644
--- a/docker/env.yaml
+++ b/docker/env.yaml
@@ -213,7 +213,7 @@ dependencies:
   - ecdsa
   - jupyter
   - jupyterlab
-  - jupyterlab_code_formatter
+  - jupyterlab_code_formatter<3.0
   - jupyterlab-spellchecker
   - jupyterlab-code-snippets
   - jupyterlab-dash