diff --git a/spack.yaml b/spack.yaml
index 57c08784f39bdc49895aadd2dfd7a771a7e4b305..b72f01004a6b667aa9232950b0086eb2d7e25630 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -27,7 +27,7 @@ spack:
     - heppdt@2.06.01
     - imagemagick@7.0.8-7
     - intel-tbb@2020.3
-    - irt@1.0.0
+    - irt@1.0.5
     - jana2@2.0.8 -ipo +root +zmq
     - lcov@1.15
     - madx@5.08.01