diff --git a/workflow/envs/gatk4.yaml b/workflow/envs/gatk4.yaml
index d13bace..7cac917 100644
--- a/workflow/envs/gatk4.yaml
+++ b/workflow/envs/gatk4.yaml
@@ -3,4 +3,4 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - bioconda::gatk4 =4.1.8.1  
\ No newline at end of file
+  - bioconda::gatk4 =4.1.0.0