diff --git a/spack.yaml b/spack.yaml
index bc72446cfa59ca09e6ca451d7d679f3b1f6852e1..1b7ed4093a7253e1a802a375d7235dc7b58b2b8d 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -28,7 +28,7 @@ spack:
     - python@3.9.7
     - py-numpy@1.21.3
     - py-pip@21.1.2
-    - qt +opengl
+    - qt@5.15.2 +opengl
     - root@6.24.06 cxxstd=17 
           +fftw +fortran +gdml +http +mlp +pythia8 
           +root7 +tmva +vc +xrootd +ssl