diff --git a/environment.yml b/environment.yml
index 2f72be2..ffbd747 100644
--- a/environment.yml
+++ b/environment.yml
@@ -61,3 +61,5 @@ dependencies:
   - otter-grader==5.4.0
   - duckdb==0.10.1
   - duckdb_engine==0.11.2
+  # pulled in by ottr, if not pinned to 1.16.2, 1.16.3 causes DH-323
+  - jupytext==1.16.2