diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 25cb32e..034b93b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -432,3 +432,34 @@ jobs:
       - name: Verify Gomplate Installation
         run: |
           gomplate --version
+
+  test-setup-gomplate-custom-version:
+    name: Test Setup Gomplate (custom version)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        id: harden-runner
+        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
+        with:
+          egress-policy: audit
+
+      - name: Checkout Repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Run Setup Gomplate Action (non-default version)
+        uses: ./
+        with:
+          setup-gomplate: true
+          gomplate-version: v4.3.3
+
+      - name: Verify Gomplate Version Matches Input
+        env:
+          EXPECTED_VERSION: 4.3.3
+        run: |
+          ACTUAL="$(gomplate --version)"
+          ESCAPED_EXPECTED_VERSION="$(printf '%s\n' "${EXPECTED_VERSION}" | sed 's/[][(){}.^$*+?|\\]/\\&/g')"
+          echo "gomplate reported: ${ACTUAL}"
+          if ! echo "${ACTUAL}" | grep -qE "(^|[^0-9.])${ESCAPED_EXPECTED_VERSION}([^0-9.]|$)"; then
+            echo "Expected gomplate version ${EXPECTED_VERSION}, got: ${ACTUAL}"
+            exit 1
+          fi
diff --git a/README.md b/README.md
index 093c79c..b2fd06b 100644
--- a/README.md
+++ b/README.md
@@ -127,9 +127,10 @@ Common steps for initializing a job for GitHub actions. This composite action co
 
 **Gomplate**
 
-| Input          | Description               | Required | Default |
-|----------------|---------------------------|----------|---------|
-| setup-gomplate | Whether to setup gomplate | No       | false   |
+| Input            | Description                           | Required | Default |
+|------------------|---------------------------------------|----------|---------|
+| setup-gomplate   | Whether to setup gomplate             | No       | false   |
+| gomplate-version | Gomplate version to use (e.g. v5.0.0) | No       | v5.0.0  |
 
 > [!NOTE]
 > `setup-gomplate` currently installs the Linux AMD64 gomplate release artifact.
diff --git a/action.yml b/action.yml
index e0016ba..3ff1904 100644
--- a/action.yml
+++ b/action.yml
@@ -143,6 +143,10 @@ inputs:
     description: 'Whether to setup gomplate'
     required: false
     default: 'false'
+  gomplate-version:
+    description: 'Gomplate version to use (e.g. v5.0.0)'
+    required: false
+    default: 'v5.0.0'
   task-version:
     description: 'Task version to use'
     required: false
@@ -438,17 +442,24 @@ runs:
       id: setup-gomplate-params
       if: ${{ inputs.setup-gomplate == 'true' }}
       shell: bash
+      env:
+        GOMPLATE_VERSION: ${{ inputs.gomplate-version }}
       run: |
         echo "::group::Setting up gomplate"
-        echo "Version: v5.0.0"
+        echo "Version: ${GOMPLATE_VERSION}"
         echo "::endgroup::"
 
     - name: Install Gomplate
       id: setup-gomplate
       if: ${{ inputs.setup-gomplate == 'true' }}
       shell: bash
+      env:
+        GOMPLATE_VERSION: ${{ inputs.gomplate-version }}
       run: |
-        GOMPLATE_VERSION="v5.0.0"
+        if [[ ! "${GOMPLATE_VERSION}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+          echo "Invalid gomplate-version: '${GOMPLATE_VERSION}' (expected format vMAJOR.MINOR.PATCH, e.g. v5.0.0)"
+          exit 1
+        fi
         GOMPLATE_RELEASE_URL="https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}"
 
         curl -sSfL "${GOMPLATE_RELEASE_URL}/gomplate_linux-amd64" \