diff --git a/bio/sourmash/compute/environment.yaml b/bio/sourmash/compute/environment.yaml
index 4625841604e..6622991f1c8 100644
--- a/bio/sourmash/compute/environment.yaml
+++ b/bio/sourmash/compute/environment.yaml
@@ -3,4 +3,4 @@ channels:
   - bioconda
   - nodefaults
 dependencies:
-  - sourmash==2.0.0a7
+  - sourmash =4.5.0