diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index c510399d9..8de8c1206 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -28,8 +28,7 @@ jobs:
           init-shell: >-
             bash
           cache-environment: true
-          cache-environment-key: environment-${{ github.sha }}
-          post-cleanup: 'all'
+          cache-environment-key: mamba-env-${{ runner.os }}-${{ hashFiles('**/training/environment.yml') }}
       
       #----------------------------------------------
       #       load cached venv if cache exists