diff --git a/.github/workflows/appstore-build-publish.yml b/.github/workflows/appstore-build-publish.yml
index 46d029e..9345cba 100644
--- a/.github/workflows/appstore-build-publish.yml
+++ b/.github/workflows/appstore-build-publish.yml
@@ -135,6 +135,36 @@ jobs:
           tag: ${{ github.ref }}
           overwrite: true
 
+      - name: Ensure app exists in Nextcloud appstore
+        env:
+          APPSTORE_TOKEN: ${{ secrets.APPSTORE_TOKEN }}
+          APP_PRIVATE_KEY: ${{ secrets.APP_PRIVATE_KEY }}
+        run: |
+          APPSTORE_TOKEN="$(printf '%s' "$APPSTORE_TOKEN" | tr -d '\r\n')"
+          KEY_FILE="$RUNNER_TEMP/${{ env.APP_NAME }}.key"
+          CERT_FILE="$RUNNER_TEMP/${{ env.APP_NAME }}.crt"
+          RESPONSE_FILE="$RUNNER_TEMP/appstore-register-response.json"
+
+          printf '%s' "$APP_PRIVATE_KEY" > "$KEY_FILE"
+          curl -fsSL "https://raw.githubusercontent.com/nextcloud/app-certificate-requests/master/${{ env.APP_NAME }}/${{ env.APP_NAME }}.crt" -o "$CERT_FILE"
+
+          REGISTER_SIGNATURE="$(printf '%s' '${{ env.APP_NAME }}' | openssl dgst -sha512 -sign "$KEY_FILE" | openssl base64 -A)"
+          CERT_CONTENT="$(cat "$CERT_FILE")"
+          PAYLOAD="$(jq -nc --arg certificate "$CERT_CONTENT" --arg signature "$REGISTER_SIGNATURE" '{certificate:$certificate, signature:$signature}')"
+
+          HTTP_STATUS="$(curl -sS -o "$RESPONSE_FILE" -w '%{http_code}' -X POST https://apps.nextcloud.com/api/v1/apps \
+            -H "Authorization: Token ${APPSTORE_TOKEN}" \
+            -H 'Content-Type: application/json' \
+            --data "$PAYLOAD")"
+
+          echo "App registration status: $HTTP_STATUS"
+          cat "$RESPONSE_FILE"
+
+          if [ "$HTTP_STATUS" != "201" ] && [ "$HTTP_STATUS" != "204" ]; then
+            echo "::error::App registration failed with HTTP $HTTP_STATUS"
+            exit 1
+          fi
+
       - name: Upload app to Nextcloud appstore
         env:
           APPSTORE_TOKEN: ${{ secrets.APPSTORE_TOKEN }}
diff --git a/.github/workflows/nightly-release.yml b/.github/workflows/nightly-release.yml
index a65d500..21f8507 100644
--- a/.github/workflows/nightly-release.yml
+++ b/.github/workflows/nightly-release.yml
@@ -229,6 +229,36 @@ jobs:
           tag: ${{ steps.version.outputs.tag }}
           overwrite: true
 
+      - name: Ensure app exists in Nextcloud appstore
+        env:
+          APPSTORE_TOKEN: ${{ secrets.APPSTORE_TOKEN }}
+          APP_PRIVATE_KEY: ${{ secrets.APP_PRIVATE_KEY }}
+        run: |
+          APPSTORE_TOKEN="$(printf '%s' "$APPSTORE_TOKEN" | tr -d '\r\n')"
+          KEY_FILE="$RUNNER_TEMP/${{ env.APP_NAME }}.key"
+          CERT_FILE="$RUNNER_TEMP/${{ env.APP_NAME }}.crt"
+          RESPONSE_FILE="$RUNNER_TEMP/appstore-register-response.json"
+
+          printf '%s' "$APP_PRIVATE_KEY" > "$KEY_FILE"
+          curl -fsSL "https://raw.githubusercontent.com/nextcloud/app-certificate-requests/master/${{ env.APP_NAME }}/${{ env.APP_NAME }}.crt" -o "$CERT_FILE"
+
+          REGISTER_SIGNATURE="$(printf '%s' '${{ env.APP_NAME }}' | openssl dgst -sha512 -sign "$KEY_FILE" | openssl base64 -A)"
+          CERT_CONTENT="$(cat "$CERT_FILE")"
+          PAYLOAD="$(jq -nc --arg certificate "$CERT_CONTENT" --arg signature "$REGISTER_SIGNATURE" '{certificate:$certificate, signature:$signature}')"
+
+          HTTP_STATUS="$(curl -sS -o "$RESPONSE_FILE" -w '%{http_code}' -X POST https://apps.nextcloud.com/api/v1/apps \
+            -H "Authorization: Token ${APPSTORE_TOKEN}" \
+            -H 'Content-Type: application/json' \
+            --data "$PAYLOAD")"
+
+          echo "App registration status: $HTTP_STATUS"
+          cat "$RESPONSE_FILE"
+
+          if [ "$HTTP_STATUS" != "201" ] && [ "$HTTP_STATUS" != "204" ]; then
+            echo "::error::App registration failed with HTTP $HTTP_STATUS"
+            exit 1
+          fi
+
       - name: Upload app to Nextcloud appstore (nightly)
         env:
           APPSTORE_TOKEN: ${{ secrets.APPSTORE_TOKEN }}