diff --git a/environment.yml b/environment.yml
index f317690..0557e41 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,8 +3,8 @@ channels:
   - conda-forge
 dependencies:
   - numpy
-  - jupyter-server-proxy
-  - code-server >=3.2
+  - jupyter-server-proxy=3.2.1
+  - code-server=4.1.0
   - snakemake-minimal >=7.3
   - jinja2
   - matplotlib