diff --git a/conda-recipe/meta.yaml b/conda-recipe/meta.yaml
index 98b84ad6fb69cc09faa83602f39dbb241c239a56..80fb0be6d0eabaa9f619e57c928239cdfcd8db67 100644
--- a/conda-recipe/meta.yaml
+++ b/conda-recipe/meta.yaml
@@ -87,7 +87,7 @@ requirements:
     - mock
     #- flake8
     #- flake8-docstrings
-    - black
+    - black ==23.1
     # For development, e.g. in container.
     #- ripgrep
     #- vim