diff --git a/environment.yml b/environment.yml
index 1b7393e..c91aadf 100644
--- a/environment.yml
+++ b/environment.yml
@@ -8,7 +8,7 @@ dependencies:
   - pytorch
   - torchvision
   - pip:
-    - diffdrr>=0.3.9
+    - diffdrr=0.3.9
     - h5py
     - scikit-image
     - seaborn