diff --git a/config/main.bicep b/config/main.bicep
index 0a112bc..3ea4920 100644
--- a/config/main.bicep
+++ b/config/main.bicep
@@ -145,7 +145,9 @@ resource containerApp 'Microsoft.App/containerApps@2022-03-01' = {
             }
           ]
           resources: {
-            cpu: '0.5'
+            // 'containerapps' 'cpu' expects 'int | null' #5993
+            // https://github.com/Azure/bicep/issues/5993#issuecomment-1043170716
+            cpu: json('0.5')
             memory: '1.0Gi'
           }
         }