diff --git a/conda-envs/mlos-windows.yml b/conda-envs/mlos-windows.yml
index f8921437455..4bc4e7b7d90 100644
--- a/conda-envs/mlos-windows.yml
+++ b/conda-envs/mlos-windows.yml
@@ -23,7 +23,7 @@ dependencies:
   - pyarrow
   - swig
   - libpq
-  - python
+  - python=3.11
   # Install an SMAC requirement pre-compiled from conda-forge.
   # This also requires a more recent vs2015_runtime from conda-forge.
   - conda-forge::pyrfr>=0.9.0