diff --git a/setup.cfg b/setup.cfg
index 5d9f3524..cc8042a5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ install_requires =
     Click>=7.0
     imgui>=1.2.0
     matplotlib>=3.0
-    numpy>=1.18.0
+    numpy>=1.18.0, <2
     pyOpenGL>=3.1.5
     pyglet>=2.0.dev0
     pyyaml>=5.3.1