diff --git a/.github/workflows/tag.yaml b/.github/workflows/tag.yaml
deleted file mode 100644
index f34469b23..000000000
--- a/.github/workflows/tag.yaml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: Tag
-
-on:
-  push:
-    tags:
-      - "**"
-
-jobs:
-  push:
-    name: Push Docker
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Set Release Tag
-        run: echo "TAG=$(echo ${GITHUB_REF} | sed 's/refs\/tags\///')" >> $GITHUB_ENV
-
-      - uses: ./.github/actions/push
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          tags: "ghcr.io/${{ github.repository }}/immutable-geth:${{ env.TAG }}"
diff --git a/.github/workflows/testnet.yaml b/.github/workflows/testnet.yaml
new file mode 100644
index 000000000..0bf434b17
--- /dev/null
+++ b/.github/workflows/testnet.yaml
@@ -0,0 +1,31 @@
+name: Push Testnet Docker Image
+
+on:
+  workflow_dispatch:
+    inputs:
+      dev:
+        description: "Develop tag to push as testnet (e.g. develop-1736464855-git.6a0aa89)"
+        required: true
+
+jobs:
+  tag_and_push_testnet_image:
+    name: Tag and Push Testnet Image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Promote Develop image to Testnet
+        shell: bash
+        run: |
+          dev_tag="${{ inputs.dev }}"
+          dev_image="ghcr.io/${{ github.repository }}/immutable-geth:$dev_tag"
+          testnet_tag="$(echo "$dev_tag" | sed "s/develop/testnet/g")"
+          testnet_image="ghcr.io/${{ github.repository }}/immutable-geth:$testnet_tag"
+
+          docker pull "$dev_image"
+          docker tag "$dev_image" $testnet_image"
+          docker push "$testnet_image"