diff --git a/requirements.txt b/requirements.txt
index 1e61983..10c8010 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 cpmpy
 ortools
 exact # for fast incremental solving
-numpy
+numpy==1.26.4
 
 # Requirements for visualization
 pandas==2.1.4