diff --git a/environment.yml b/environment.yml
index 938b5b6b8..f58434c15 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,7 +4,7 @@ channels:
 # - defaults
 dependencies:
 # 1/4 req main
-    - python>=3.7
+    - python>=3.7,<3.9
     - numpy
     - pandas
     - pip