diff --git a/lib/installer.js b/lib/installer.js
index e97e625..a629bfd 100644
--- a/lib/installer.js
+++ b/lib/installer.js
@@ -203,6 +203,8 @@ function installJulia(versionInfo, version, arch) {
             case 'darwin':
                 yield exec.exec('hdiutil', ['attach', juliaDownloadPath]);
                 yield exec.exec('/bin/bash', ['-c', `cp -a /Volumes/Julia-*/Julia-*.app/Contents/Resources/julia ${tempInstallDir}`]);
+                // Unmount dmg file again to avoid issues on self-hosted runners
+                yield exec.exec('hdiutil', ['unmount', juliaDownloadPath]);
                 return path.join(tempInstallDir, 'julia');
             default:
                 throw new Error(`Platform ${osPlat} is not supported`);
diff --git a/package-lock.json b/package-lock.json
index 528ac1c..346ce1a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,7 @@
   "packages": {
     "": {
       "name": "setup-julia",
-      "version": "1.6.1",
+      "version": "1.7.1",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.2.6",
diff --git a/package.json b/package.json
index 76f24a0..6f858e4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "setup-julia",
-  "version": "1.7.1",
+  "version": "1.7.2",
   "private": true,
   "description": "setup Julia action",
   "main": "lib/setup-julia.js",
diff --git a/src/installer.ts b/src/installer.ts
index 8a1e94b..7bdfaf6 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -203,6 +203,10 @@ export async function installJulia(versionInfo, version: string, arch: string):
         case 'darwin':
             await exec.exec('hdiutil', ['attach', juliaDownloadPath])
             await exec.exec('/bin/bash', ['-c', `cp -a /Volumes/Julia-*/Julia-*.app/Contents/Resources/julia ${tempInstallDir}`])
+
+            // Unmount dmg file again to avoid issues on self-hosted runners
+            await exec.exec('hdiutil', ['unmount', juliaDownloadPath])
+
             return path.join(tempInstallDir, 'julia')
         default:
             throw new Error(`Platform ${osPlat} is not supported`)