diff --git a/dist/index.js b/dist/index.js
index 10dec11..8a37478 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -267,7 +267,7 @@ class GitAuthHelper {
                 // Configure both host and container paths to support Docker container actions.
                 for (const configPath of configPaths) {
                     // Submodule Git directory
-                    let submoduleGitDir = path.dirname(configPath); // The config file is at .git/modules/submodule-name/config
+                    let submoduleGitDir = yield fs.promises.realpath(path.dirname(configPath)); // The config file is at .git/modules/submodule-name/config
                     submoduleGitDir = submoduleGitDir.replace(/\\/g, '/'); // Use forward slashes, even on Windows
                     // Configure host includeIf
                     yield this.git.config(`includeIf.gitdir:${submoduleGitDir}.path`, credentialsConfigPath, false, // globalConfig?
@@ -407,7 +407,7 @@ class GitAuthHelper {
             }
             else {
                 // Host git directory
-                let gitDir = fs.realpathSync(path.join(this.git.getWorkingDirectory(), '.git'));
+                let gitDir = yield fs.promises.realpath(path.join(this.git.getWorkingDirectory(), '.git'));
                 gitDir = gitDir.replace(/\\/g, '/'); // Use forward slashes, even on Windows
                 // Configure host includeIf
                 const hostIncludeKey = `includeIf.gitdir:${gitDir}.path`;
diff --git a/src/git-auth-helper.ts b/src/git-auth-helper.ts
index 60cd41f..ddd8862 100644
--- a/src/git-auth-helper.ts
+++ b/src/git-auth-helper.ts
@@ -177,7 +177,9 @@ class GitAuthHelper {
       // Configure both host and container paths to support Docker container actions.
       for (const configPath of configPaths) {
         // Submodule Git directory
-        let submoduleGitDir = path.dirname(configPath) // The config file is at .git/modules/submodule-name/config
+        let submoduleGitDir = await fs.promises.realpath(
+          path.dirname(configPath)
+        ) // The config file is at .git/modules/submodule-name/config
         submoduleGitDir = submoduleGitDir.replace(/\\/g, '/') // Use forward slashes, even on Windows
 
         // Configure host includeIf
@@ -367,7 +369,7 @@ class GitAuthHelper {
       )
     } else {
       // Host git directory
-      let gitDir = fs.realpathSync(
+      let gitDir = await fs.promises.realpath(
         path.join(this.git.getWorkingDirectory(), '.git')
       )
       gitDir = gitDir.replace(/\\/g, '/') // Use forward slashes, even on Windows