diff --git a/bio/plass/environment.yaml b/bio/plass/environment.yaml
index de16f1d912..0fab208e11 100644
--- a/bio/plass/environment.yaml
+++ b/bio/plass/environment.yaml
@@ -3,4 +3,4 @@ channels:
   - bioconda
   - nodefaults
 dependencies:
-  - plass=2.c7e35
+  - plass =4.687d7