diff --git a/README.md b/README.md
index 82ddc81..d39478d 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ This Action commits the contents of your Git tag to the WordPress.org plugin rep
 
 * `generate-zip` - Defaults to `false`. Generate a ZIP file from the SVN `trunk` directory. Outputs a `zip-path` variable for use in further workflow steps.
 * `dry-run` - Defaults to `false`. Set this to `true` if you want to skip the final Subversion commit step (e.g., to debug prior to a non-dry-run commit). `dry-run` - `true` Doesn't require SVN secret.
+* `trunk-only` - Defaults to `false`. When set to `true`, deploys only to the WordPress.org `trunk` and `assets` directories without creating a new tag in the plugin repository. Useful for updating `readme.txt` (for example, the `Tested up to` value) or assets between full releases.
 
 ### Outputs
 
@@ -84,6 +85,7 @@ Current set of example workflow files:
 ```
 
 * [Deploy on pushing a new tag and create release with attached ZIP](examples/deploy-on-pushing-a-new-tag-and-create-release-with-attached-zip.yml)
+* [Deploy to both trunk and tag during release, and only to trunk during commits to the main branch](examples/deploy-on-tag-and-branch.yml)
 
 ## Contributing
 
diff --git a/action.yml b/action.yml
index 2ca03ca..e8f2397 100644
--- a/action.yml
+++ b/action.yml
@@ -11,6 +11,9 @@ inputs:
   dry-run:
     description: 'Run the deployment process without committing.'
     default: false
+  trunk-only:
+    description: 'Deploy only to trunk/assets without creating a new tag.'
+    default: false
 outputs:
   zip-path:
     description: 'Path to zip file'
@@ -22,5 +25,6 @@ runs:
       env:
         INPUT_GENERATE_ZIP: ${{ inputs.generate-zip }}
         INPUT_DRY_RUN: ${{ inputs.dry-run }}
+        INPUT_TRUNK_ONLY: ${{ inputs.trunk-only }}
       run: ${{ github.action_path }}/deploy.sh
       shell: bash
diff --git a/deploy.sh b/deploy.sh
index 70aac3b..e394765 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -67,12 +67,23 @@ if [[ -z "$SLUG" ]]; then
 fi
 echo "ℹ︎ SLUG is $SLUG"
 
-# Allow setting custom version number in advanced workflows
-if [[ -z "$VERSION" ]]; then
+# Allow setting custom version number in advanced workflows.
+# By default, only derive VERSION from tag refs; branch refs will
+# result in an empty VERSION so we can support trunk-only deployments.
+if [[ -z "$VERSION" && "$GITHUB_REF" == refs/tags/* ]]; then
 	VERSION="${GITHUB_REF#refs/tags/}"
 	VERSION="${VERSION#v}"
 fi
-echo "ℹ︎ VERSION is $VERSION"
+if [[ -n "$VERSION" ]]; then
+	echo "ℹ︎ VERSION is $VERSION"
+else
+	echo "ℹ︎ VERSION is not set; trunk-only deployment assumed unless overridden."
+fi
+
+# Cast to empty string when not set for easier -n checks.
+if [[ "$INPUT_TRUNK_ONLY" != "true" ]]; then
+	INPUT_TRUNK_ONLY=""
+fi
 
 if [[ -z "$ASSETS_DIR" ]]; then
 	ASSETS_DIR=".wordpress-org"
@@ -118,7 +129,9 @@ generate_zip() {
 }
 
 # Bail early if the plugin version is already published.
-if [[ -d "tags/$VERSION" ]]; then
+# Only relevant when we are creating a new tag, not for
+# trunk-only deployments where VERSION may be empty.
+if [[ -n "$VERSION" && -d "tags/$VERSION" && -z "$INPUT_TRUNK_ONLY" ]]; then
 	echo "ℹ︎ Version $VERSION of plugin $SLUG was already published";
 
 	generate_zip
@@ -203,9 +216,12 @@ svn add . --force > /dev/null
 # Also suppress stdout here
 svn status | grep '^\!' | sed 's/! *//' | xargs -I% svn rm %@ > /dev/null
 
-# Copy tag locally to make this a single commit
-echo "➤ Copying tag..."
-svn cp "trunk" "tags/$VERSION"
+# Copy tag locally to make this a single commit when not
+# doing a trunk-only deployment.
+if [[ -n "$VERSION" && -z "$INPUT_TRUNK_ONLY" ]]; then
+	echo "➤ Copying tag..."
+	svn cp "trunk" "tags/$VERSION"
+fi
 
 # Fix screenshots getting force downloaded when clicking them
 # https://developer.wordpress.org/plugins/wordpress-org/plugin-assets/
@@ -231,7 +247,13 @@ if $INPUT_DRY_RUN; then
   echo "➤ Dry run: Files not committed."
 else
   echo "➤ Committing files..."
-  svn commit -m "Update to version $VERSION from GitHub" --no-auth-cache --non-interactive  --username "$SVN_USERNAME" --password "$SVN_PASSWORD"
+
+  COMMIT_MSG="Update from GitHub"
+  if [[ -n "$VERSION" && -z "$INPUT_TRUNK_ONLY" ]]; then
+    COMMIT_MSG="Update to version $VERSION from GitHub"
+  fi
+
+  svn commit -m "$COMMIT_MSG" --no-auth-cache --non-interactive  --username "$SVN_USERNAME" --password "$SVN_PASSWORD"
 fi
 
 generate_zip
diff --git a/examples/deploy-on-tag-and-branch.yml b/examples/deploy-on-tag-and-branch.yml
new file mode 100644
index 0000000..ca56bf7
--- /dev/null
+++ b/examples/deploy-on-tag-and-branch.yml
@@ -0,0 +1,28 @@
+name: Deploy readme and assets to WordPress.org
+on:
+  push:
+    branches:
+      # Or use your primary branch name, e.g. main, trunk, master
+      - main
+    tags:
+      # On all tags.
+jobs:
+  trunk_only_deploy:
+    name: Trunk-only deploy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        # Optional build step; remove or customize as needed.
+      - name: Build
+        run: |
+          npm install
+          npm run build
+        # Deploy to both tags and trunk on tag, or only to trunk on main branch.
+      - name: WordPress Plugin Deploy
+        uses: 10up/action-wordpress-plugin-deploy@stable
+        with:
+          trunk-only: ${{ github.ref_name == 'main' }}
+        env:
+          SVN_USERNAME: ${{ secrets.SVN_USERNAME }}
+          SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}