diff --git a/containers/env-template.yml b/containers/env-template.yml
index 697aa6a83..2b7b6f96d 100644
--- a/containers/env-template.yml
+++ b/containers/env-template.yml
@@ -9,7 +9,7 @@ dependencies:
   - setuptools
   - setuptools_scm
   - matplotlib
-  - numpy
+  - numpy<2.2  # dynesty<2.2 requires numpy<2.2
   - scipy
   - pandas
   - astropy