diff --git a/recipe.yaml b/recipe.yaml
index 80fbba41665e57bdc024ff1c48e839abbddcbf68..ddddd668c8d0c9c0608208bd3f1c2ac4b5da4864 100644
--- a/recipe.yaml
+++ b/recipe.yaml
@@ -17,6 +17,7 @@ input:
     - 'https://registry.hub.docker.com/atlas/athsimulation:21.0.*'
     - 'https://registry.hub.docker.com/atlas/athsimulation:22.0.*'
     - 'https://registry.hub.docker.com/atlas/athsimulation:sw*'
+    - 'https://registry.hub.docker.com/cmssw/cs9:x86_64*'
     - 'https://registry.hub.docker.com/cmssw/cs8:x86_64*'
     - 'https://registry.hub.docker.com/cmssw/cs8:aarch64*'
     - 'https://registry.hub.docker.com/cmssw/cs8:ppc64le*'