diff --git a/.github/env.yaml b/.github/env.yaml
index f0e1c8a..b845cc0 100644
--- a/.github/env.yaml
+++ b/.github/env.yaml
@@ -5,5 +5,5 @@ channels:
   - anaconda
 dependencies:
   - biobb_common ==4.1.0
-  - biobb_structure_checking ==3.13.3
+  - biobb_structure_checking ==3.12.1