diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 59f820c..f6439b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,7 @@ jobs:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
     env:
+      PREFIX: 'ci-v'
       TEST_TAG: 'ci-v1.2.3'
       TEST_TAG_PREREL: 'ci-v2.3.4-prerelease'
       TAG_MAJOR: 'ci-v1'
@@ -46,21 +47,21 @@ jobs:
       - name: 'TEST: Update Major'
         uses: ./.
         with:
-          tag: ${{ env.TEST_TAG }}
-          prefix: 'ci-v'
+          tag: "refs/tags/${{ env.TEST_TAG }}"
+          prefix: ${{ env.PREFIX }}
 
       - name: 'TEST: Update Minor'
         uses: ./.
         with:
-          tag: ${{ env.TEST_TAG }}
-          prefix: 'ci-v'
+          tag: "refs/tags/${{ env.TEST_TAG }}"
+          prefix: ${{ env.PREFIX }}
           update-minor: true
 
       - name: 'TEST: Ignore Prerelease'
         uses: ./.
         with:
-          tag: ${{ env.TEST_TAG_PREREL }}
-          prefix: 'ci-v'
+          tag: "refs/tags/${{ env.TEST_TAG_PREREL }}"
+          prefix: ${{ env.PREFIX }}
 
       - name: Cleanup
         if: always()
diff --git a/action.yml b/action.yml
index 7bf6c23..1627790 100644
--- a/action.yml
+++ b/action.yml
@@ -45,20 +45,24 @@ runs:
         INPUT_TAG: ${{ inputs.tag }}
         INPUT_PREFIX: ${{ inputs.prefix }}
       run: |
-        version=$INPUT_TAG
+        version="$INPUT_TAG"
         if [[ -z "$version" ]]; then
-            version=$GITHUB_REF
+            version="$GITHUB_REF"
         fi
 
+        echo "Target tag name or reference: '$version'"
+
         version="${version#refs/}"
         version="${version#tags/}"
         version="${version#$INPUT_PREFIX}"
 
+        echo "Target version: '$version'"
+
         semvertool="$GITHUB_ACTION_PATH/semver-tool/semver.sh"
 
         status=$("$semvertool" validate "$version")
         if [[ "$status" != "valid" ]]; then
-            echo ::error ::Version $version does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'
+            echo "::error ::Version '$version' does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'"
             exit 1
         fi