diff --git a/environment.yml b/environment.yml
index e8087c0..6fcf810 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,6 +2,6 @@ name: polyhedral-gravity-env
 channels:
   - conda-forge
 dependencies:
-  - numpy
+  - numpy==1.23.4
   - pytest
   - pytest-xdist
\ No newline at end of file