diff --git a/environment.yml b/environment.yml
index 1a1d67666826aa0be71ed1d2184e89211c211a52..b7585bc272b108595fce878b73d7c076b3312b7f 100644
--- a/environment.yml
+++ b/environment.yml
@@ -24,7 +24,7 @@ dependencies:
   - pip
   - pip:
     - climetlab >= 0.7.0
-    - climetlab_s2s_ai_challenge >= 0.6.2
+    - climetlab_s2s_ai_challenge >= 0.6.3
     - configargparse # for weatherbench
     - netcdf4 # ==1.5.1  # see https://github.com/pydata/xarray/issues/4925
     - git+https://github.com/phausamann/sklearn-xarray.git@develop