diff --git a/environment.yml b/environment.yml
index 55a26b67..6c7fbdb2 100644
--- a/environment.yml
+++ b/environment.yml
@@ -11,6 +11,6 @@ dependencies:
     - sphinx-multitoc-numbering
     - joblib
     - interpolation
-    - sphinx-tojupyter
+    - git+https://github.com/QuantEcon/sphinx-tojupyter
     - quantecon-book-theme