diff --git a/ci-dependencies.txt b/ci-dependencies.txt
index 1fa330385..704354f8d 100644
--- a/ci-dependencies.txt
+++ b/ci-dependencies.txt
@@ -13,7 +13,7 @@ black==22.12.0
 coverage
 
 ## Testing
-numpy
+numpy!=2.1.0
 matplotlib
 mmtf-python
 #MySQL testing disabled due to #3834: