diff --git a/environment.yml b/environment.yml
index edb73fb5e81e39561d9b1bf3362289bdff441404..c16b579a228ace0ea4818d49fa7f1b5229ac693d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -11,4 +11,5 @@ dependencies:
   - scikit-image=0.24.0
   - scikit-learn=1.5.1
   - scipy=1.14.1
-  
\ No newline at end of file
+  - pip:
+    - otter-grader==6.1.0