diff --git a/workflow/envs/grenepipe.yaml b/workflow/envs/grenepipe.yaml
index 25894f1..327c3bd 100644
--- a/workflow/envs/grenepipe.yaml
+++ b/workflow/envs/grenepipe.yaml
@@ -8,7 +8,7 @@ channels:
   # - r
 dependencies:
   # Basics
-  - mamba
+  - mamba < 2.0.0
   - git
   - curl