diff --git a/requirements.txt b/requirements.txt
index 6fc8cd05..2bb52f68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+numpy<2.0
 six
 pandas>=0.20.3
 tensorflow>=2.15.0
diff --git a/setup.py b/setup.py
index b4027727..4d4e3de2 100644
--- a/setup.py
+++ b/setup.py
@@ -39,6 +39,7 @@
         "appdirs",
         "scikit-learn",
         "mhcgnomes>=0.8.4",
+        "numpy<2.0",
         "pyyaml",
         "tqdm",
         "tensorflow>=2.15.0",