diff --git a/environment.yml b/environment.yml
index 16da73cc6..e5b35d782 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   - jupyter
   - matplotlib-base>=2.0.2
   - netcdf4>=1.1.9
-  - numpy>=1.9.1
+  - numpy>=1.9.1,<2
   - platformdirs
   - psutil
   - py>=1.4.27