diff --git a/app/services/update_deployment_service.rb b/app/services/update_deployment_service.rb
index aa7fcca1e2ab8a05f42d95aca8eae879a3375d0d..78ff5f8654f69825ae9f45aaafd3e3de4e11a747 100644
--- a/app/services/update_deployment_service.rb
+++ b/app/services/update_deployment_service.rb
@@ -51,3 +51,5 @@ def action
     environment_options[:action] || 'start'
   end
 end
+
+UpdateDeploymentService.prepend(EE::UpdateDeploymentService)
diff --git a/ee/app/services/ee/update_deployment_service.rb b/ee/app/services/ee/update_deployment_service.rb
new file mode 100644
index 0000000000000000000000000000000000000000..562e4ada2e8b78ab3f145a8177c68fb4176adcb4
--- /dev/null
+++ b/ee/app/services/ee/update_deployment_service.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module EE
+  module UpdateDeploymentService
+    extend ::Gitlab::Utils::Override
+
+    override :execute
+    def execute
+      super.tap do |deployment|
+        deployment.project.repository.log_geo_updated_event
+      end
+    end
+  end
+end
diff --git a/ee/changelogs/unreleased/9227-geo-primary-checksums-are-not-recalculated-after-deployment-refs-are-created.yml b/ee/changelogs/unreleased/9227-geo-primary-checksums-are-not-recalculated-after-deployment-refs-are-created.yml
new file mode 100644
index 0000000000000000000000000000000000000000..bff9029829c8630410f3a66e0328c832714c2f54
--- /dev/null
+++ b/ee/changelogs/unreleased/9227-geo-primary-checksums-are-not-recalculated-after-deployment-refs-are-created.yml
@@ -0,0 +1,5 @@
+---
+title: Geo - Reset the verification checksum after deployment refs are created
+merge_request: 10160
+author:
+type: fixed
diff --git a/ee/spec/services/ee/update_deployment_service_spec.rb b/ee/spec/services/ee/update_deployment_service_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..6a9c9977cd6adf8768816e81e25d29bf375d2b94
--- /dev/null
+++ b/ee/spec/services/ee/update_deployment_service_spec.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe UpdateDeploymentService do
+  include ::EE::GeoHelpers
+
+  let(:primary) { create(:geo_node, :primary) }
+  let(:project) { create(:project, :repository) }
+  let(:repository_state) { create(:repository_state, :repository_verified, project: project) }
+  let!(:deployment) { create(:deployment, :success, project: project) }
+
+  before do
+    stub_current_geo_node(primary)
+  end
+
+  subject { described_class.new(deployment) }
+
+  describe '#execute' do
+    it 'triggers a Geo event about the new deployment ref' do
+      expect_next_instance_of(Geo::RepositoryUpdatedService) do |service|
+        expect(service).to receive(:execute)
+      end
+
+      subject.execute
+    end
+
+    it 'resets the repository verification checksum' do
+      expect { subject.execute }.to change { repository_state.reload.repository_verification_checksum }.to(nil)
+    end
+
+    it 'returns the deployment' do
+      expect(subject.execute).to eq(deployment)
+    end
+  end
+end