diff --git a/spack.yaml b/spack.yaml
index d84d5cd0d38e0d9740ee055d9f83566d6de3a1e5..6595e439f16ad49f6d39278307ba07405e0134ba 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -20,6 +20,7 @@ spack:
     - imagemagick@7.0.0:7.0.99
     - madx@5.06.1
     - mesa swr=none +opengl -llvm +osmesa
+    - mesa-demos
     - nlohmann-json@3.9.1
     - opencascade@7.4.0p1
     - pkg-config@0.29.2