diff --git a/.github/workflows/demo.yml b/.github/workflows/demo.yml
index 2d32f03..fb4d409 100644
--- a/.github/workflows/demo.yml
+++ b/.github/workflows/demo.yml
@@ -126,6 +126,7 @@ jobs:
           echo "CI_REF=$CI_REF"
           echo "CI_HEAD_REF_SLUG=$CI_HEAD_REF_SLUG"
           echo "CI_HEAD_REF=$CI_HEAD_REF"
+          echo "CI_BASE_REF_SLUG=$CI_BASE_REF_SLUG"
           echo "CI_BASE_REF=$CI_BASE_REF"
           echo "CI_SHA_SHORT=$CI_SHA_SHORT"
           echo "CI_SHA=$CI_SHA"
diff --git a/README.md b/README.md
index a7e70e7..6c5ba5e 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![GitHub Action: View on Marketplace](https://img.shields.io/badge/GitHub%20Action-View_on_Marketplace-28a745?logo=github)](https://github.com/marketplace/actions/github-environment-variables-action)
 [![Demo: available](https://img.shields.io/badge/Demo-available-orange)](.github/workflows/demo.yml)
-[![Version: v2.4.0](https://img.shields.io/badge/Version-v2.4.0-brightgreen)](https://github.com/FranzDiebold/github-env-vars-action/releases/tag/v2.4.0)
+[![Version: v2.5.0](https://img.shields.io/badge/Version-v2.5.0-brightgreen)](https://github.com/FranzDiebold/github-env-vars-action/releases/tag/v2.5.0)
 [![Lint and Test](https://github.com/FranzDiebold/github-env-vars-action/workflows/Lint%20and%20Test/badge.svg)](https://github.com/FranzDiebold/github-env-vars-action/actions?query=workflow%3A%22Lint+and+Test%22)
 [![license: MIT](https://img.shields.io/badge/license-MIT-brightgreen.svg)](./LICENSE)
 
diff --git a/dist/index.js b/dist/index.js
index 44030f4..996f6c0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -192,6 +192,13 @@ try {
   const pullRequest = github.context.payload &&
       github.context.payload.pull_request;
   if (pullRequest) {
+    const prSha = github.event.pull_request.head.sha;
+    core.exportVariable('CI_PR_SHA_SHORT', getShaShort(prSha));
+    core.info(`Set CI_PR_SHA_SHORT=${process.env.CI_PR_SHA_SHORT}`);
+
+    core.exportVariable('CI_PR_SHA', prSha);
+    core.info(`Set CI_PR_SHA=${process.env.CI_PR_SHA}`);
+
     const prNumber = pullRequest.number;
     core.exportVariable('CI_PR_NUMBER', prNumber);
     core.info(`Set CI_PR_NUMBER=${process.env.CI_PR_NUMBER}`);
diff --git a/package-lock.json b/package-lock.json
index 493f2e5..b7c9b34 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "github-env-vars-action",
-  "version": "2.4.0",
+  "version": "2.5.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "github-env-vars-action",
-      "version": "2.4.0",
+      "version": "2.5.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.9.0",
diff --git a/package.json b/package.json
index 3f73b0e..54bb08d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "github-env-vars-action",
-  "version": "2.4.0",
+  "version": "2.5.0",
   "description": "A GitHub Action to expose useful environment variables.",
   "main": "index.js",
   "scripts": {