diff --git a/spack.yaml b/spack.yaml
index 5528079d6df34a2f6bdf4976277df047cf85d1b3..f51036c5480bdd27c0a290f60b0ffa0055c2319b 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -26,7 +26,7 @@ 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
     - qt +opengl
     - root@6.24.06 cxxstd=17