diff --git a/gapic-generator/lib/gapic/presenters/service_presenter.rb b/gapic-generator/lib/gapic/presenters/service_presenter.rb
index d748c2214..ebea2bca9 100644
--- a/gapic-generator/lib/gapic/presenters/service_presenter.rb
+++ b/gapic-generator/lib/gapic/presenters/service_presenter.rb
@@ -526,7 +526,7 @@ def grpc_full_name
       #
       # @return [Hash]
       def drift_manifest
-        {
+        h = {
           clients: {
             grpc: {
               libraryClient: client_name_full,
@@ -538,6 +538,8 @@ def drift_manifest
             }
           }
         }
+        h[:apiVersion] = @service.api_version unless @service.api_version.empty?
+        h
       end
 
       ##
diff --git a/shared/output/gapic/templates/showcase/gapic_metadata.json b/shared/output/gapic/templates/showcase/gapic_metadata.json
index d1273beb1..cd91c7d7a 100644
--- a/shared/output/gapic/templates/showcase/gapic_metadata.json
+++ b/shared/output/gapic/templates/showcase/gapic_metadata.json
@@ -126,7 +126,8 @@
             }
           }
         }
-      }
+      },
+      "apiVersion": "v1_20240408"
     },
     "Identity": {
       "clients": {