diff --git a/dist/index.js b/dist/index.js
index 4122b9bd..74e8a0f6 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2247,11 +2247,18 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
 Object.defineProperty(exports, "__esModule", { value: true });
-const childProcess = __webpack_require__(4);
-const path = __webpack_require__(622);
+const childProcess = __importStar(__webpack_require__(4));
+const path = __importStar(__webpack_require__(622));
 const util_1 = __webpack_require__(669);
-const ioUtil = __webpack_require__(962);
+const ioUtil = __importStar(__webpack_require__(962));
 const exec = util_1.promisify(childProcess.exec);
 /**
  * Copies a file or folder.
@@ -2419,58 +2426,73 @@ function which(tool, check) {
                     throw new Error(`Unable to locate executable file: ${tool}. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.`);
                 }
             }
+            return result;
         }
-        try {
-            // build the list of extensions to try
-            const extensions = [];
-            if (ioUtil.IS_WINDOWS && process.env.PATHEXT) {
-                for (const extension of process.env.PATHEXT.split(path.delimiter)) {
-                    if (extension) {
-                        extensions.push(extension);
-                    }
-                }
-            }
-            // if it's rooted, return it if exists. otherwise return empty.
-            if (ioUtil.isRooted(tool)) {
-                const filePath = yield ioUtil.tryGetExecutablePath(tool, extensions);
-                if (filePath) {
-                    return filePath;
+        const matches = yield findInPath(tool);
+        if (matches && matches.length > 0) {
+            return matches[0];
+        }
+        return '';
+    });
+}
+exports.which = which;
+/**
+ * Returns a list of all occurrences of the given tool on the system path.
+ *
+ * @returns   Promise<string[]>  the paths of the tool
+ */
+function findInPath(tool) {
+    return __awaiter(this, void 0, void 0, function* () {
+        if (!tool) {
+            throw new Error("parameter 'tool' is required");
+        }
+        // build the list of extensions to try
+        const extensions = [];
+        if (ioUtil.IS_WINDOWS && process.env['PATHEXT']) {
+            for (const extension of process.env['PATHEXT'].split(path.delimiter)) {
+                if (extension) {
+                    extensions.push(extension);
                 }
-                return '';
             }
-            // if any path separators, return empty
-            if (tool.includes('/') || (ioUtil.IS_WINDOWS && tool.includes('\\'))) {
-                return '';
-            }
-            // build the list of directories
-            //
-            // Note, technically "where" checks the current directory on Windows. From a toolkit perspective,
-            // it feels like we should not do this. Checking the current directory seems like more of a use
-            // case of a shell, and the which() function exposed by the toolkit should strive for consistency
-            // across platforms.
-            const directories = [];
-            if (process.env.PATH) {
-                for (const p of process.env.PATH.split(path.delimiter)) {
-                    if (p) {
-                        directories.push(p);
-                    }
-                }
+        }
+        // if it's rooted, return it if exists. otherwise return empty.
+        if (ioUtil.isRooted(tool)) {
+            const filePath = yield ioUtil.tryGetExecutablePath(tool, extensions);
+            if (filePath) {
+                return [filePath];
             }
-            // return the first match
-            for (const directory of directories) {
-                const filePath = yield ioUtil.tryGetExecutablePath(directory + path.sep + tool, extensions);
-                if (filePath) {
-                    return filePath;
+            return [];
+        }
+        // if any path separators, return empty
+        if (tool.includes(path.sep)) {
+            return [];
+        }
+        // build the list of directories
+        //
+        // Note, technically "where" checks the current directory on Windows. From a toolkit perspective,
+        // it feels like we should not do this. Checking the current directory seems like more of a use
+        // case of a shell, and the which() function exposed by the toolkit should strive for consistency
+        // across platforms.
+        const directories = [];
+        if (process.env.PATH) {
+            for (const p of process.env.PATH.split(path.delimiter)) {
+                if (p) {
+                    directories.push(p);
                 }
             }
-            return '';
         }
-        catch (err) {
-            throw new Error(`which failed with message ${err.message}`);
+        // find all matches
+        const matches = [];
+        for (const directory of directories) {
+            const filePath = yield ioUtil.tryGetExecutablePath(path.join(directory, tool), extensions);
+            if (filePath) {
+                matches.push(filePath);
+            }
         }
+        return matches;
     });
 }
-exports.which = which;
+exports.findInPath = findInPath;
 function readCopyOptions(options) {
     const force = options.force == null ? true : options.force;
     const recursive = Boolean(options.recursive);
@@ -4858,11 +4880,18 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
 var _a;
 Object.defineProperty(exports, "__esModule", { value: true });
 const assert_1 = __webpack_require__(357);
-const fs = __webpack_require__(747);
-const path = __webpack_require__(622);
+const fs = __importStar(__webpack_require__(747));
+const path = __importStar(__webpack_require__(622));
 _a = fs.promises, exports.chmod = _a.chmod, exports.copyFile = _a.copyFile, exports.lstat = _a.lstat, exports.mkdir = _a.mkdir, exports.readdir = _a.readdir, exports.readlink = _a.readlink, exports.rename = _a.rename, exports.rmdir = _a.rmdir, exports.stat = _a.stat, exports.symlink = _a.symlink, exports.unlink = _a.unlink;
 exports.IS_WINDOWS = process.platform === 'win32';
 function exists(fsPath) {
diff --git a/package.json b/package.json
index 3802e6e0..70819c7e 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
   "dependencies": {
     "@actions/core": "^1.2.6",
     "@actions/exec": "^1.0.4",
-    "@actions/io": "^1.0.2",
+    "@actions/io": "^1.1.0",
     "semver": "^7.3.5"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 5c22776b..401ba52a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -14,10 +14,10 @@
   dependencies:
     "@actions/io" "^1.0.1"
 
-"@actions/io@^1.0.1", "@actions/io@^1.0.2":
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/@actions/io/-/io-1.0.2.tgz#2f614b6e69ce14d191180451eb38e6576a6e6b27"
-  integrity sha512-J8KuFqVPr3p6U8W93DOXlXW6zFvrQAJANdS+vw0YhusLIq+bszW8zmK2Fh1C2kDPX8FMvwIl1OUcFgvJoXLbAg==
+"@actions/io@^1.0.1", "@actions/io@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@actions/io/-/io-1.1.0.tgz#02c98b5ed93c3331981c9a075494066400eadb7a"
+  integrity sha512-PspSX7Z9zh2Fyyuf3F6BsYeXcYHfc/VJ1vwy2vouas95efHVd42M6UfBFRs+jY0uiMDXhAoUtATn9g2r1MaWBQ==
 
 "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.10.4":
   version "7.10.4"