diff --git a/environment.yml b/environment.yml
index 6face60..bd9689a 100644
--- a/environment.yml
+++ b/environment.yml
@@ -22,7 +22,7 @@ dependencies:
   - pip:
       - polars
       - pyarrow<17.0
-      - biobear
+      - biobear>=0.20.3,<0.21
       - numba
       - pydeseq2
       - simple_colors