diff --git a/spack.yaml b/spack.yaml
index 1c355317cadbd01b892b66c5d58d28157a84b462..7aff422ae2ac0b7c7d6ce50ba7b1c641963ae014 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