diff --git a/.github/actions/swarm-deploy/action.yml b/.github/actions/swarm-deploy/action.yml
index d3ae001e..e4a3deb9 100644
--- a/.github/actions/swarm-deploy/action.yml
+++ b/.github/actions/swarm-deploy/action.yml
@@ -36,7 +36,7 @@ runs:
           
           jq '.Spec.TaskTemplate.ContainerSpec.Image="${{ inputs.IMAGE_TAG}}" | .Spec' service.spec.json > update.spec.json
           
-          curl -s -X POST -H "X-API-Key: ${{env.PORTAINER_API_KEY}}" http://${{inputs.PORTAINER_DOMAIN}}/api/endpoints/${{env.ENDPOINT_ID}}/docker/services/${{ inputs.STACK_NAME }}/update?version=$version -d @update.spec.json
+            curl -s -X POST -H "X-API-Key: ${{env.PORTAINER_API_KEY}}" -H "Content-Type: application/json" http://${{inputs.PORTAINER_DOMAIN}}/api/endpoints/${{env.ENDPOINT_ID}}/docker/services/${{ inputs.STACK_NAME }}/update?version=$version -d @update.spec.json
           
           echo PREVIOUS_IMAGE=$previousimg >> $GITHUB_OUTPUT
           echo DEPLOYED_DATE=$(date -u) >> $GITHUB_OUTPUT