diff --git a/spack.yaml b/spack.yaml
index efae72566b0861d45b2d230a054ad7e8f455d1d3..0be15ce7853b8ca3b7d676fcf939374364c588cf 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -27,7 +27,7 @@ spack:
     - podio@0.14 build_type=RelWithDebInfo
     - pythia8@8.306 +fastjet
     - python@3.9.7
-    - py-numpy@1.20.1
+    - py-numpy@1.21.3
     - py-pip@20.2
     - py-setuptools@58.2.0
     - py-wheel@0.36.2