diff --git a/env_a.yaml b/env_a.yaml
index 5ae9e3b..573e6b2 100644
--- a/env_a.yaml
+++ b/env_a.yaml
@@ -4,4 +4,3 @@ channels:
     - bioconda
 dependencies:
     - arriba=2.4.0
-    - samtools=1.9