diff --git a/environment.yml b/environment.yml
index 2b9179b..075f66e 100755
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ dependencies:
   - python=3.7.0 #Python version supported by imaris
   - pip
   - pip:
-    - SimpleITK >= 2.0.0
+    - SimpleITK == 2.2.1
     - numpy
     - pandas
     - h5py>=2.10.0