diff --git a/envs/environment.yaml b/envs/environment.yaml
index 646a71ea..fe2282bc 100644
--- a/envs/environment.yaml
+++ b/envs/environment.yaml
@@ -11,7 +11,7 @@ dependencies:
 - pip
 
 - atlite>=0.2.9
-- pypsa>=0.25.2
+- pypsa==0.25.2
 - linopy
 - dask