diff --git a/package-lock.json b/package-lock.json
index e1b08290..cb6f89a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4360,7 +4360,6 @@
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -4556,8 +4555,7 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4647,8 +4645,7 @@
         },
         "yallist": {
           "version": "3.0.3",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         }
       }
     },
diff --git a/packages/github/package-lock.json b/packages/github/package-lock.json
index deceb0f6..1fb680e4 100644
--- a/packages/github/package-lock.json
+++ b/packages/github/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/github",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/packages/tool-cache/__tests__/externals/zip b/packages/tool-cache/__tests__/externals/zip
deleted file mode 100755
index 1bbc48ef..00000000
Binary files a/packages/tool-cache/__tests__/externals/zip and /dev/null differ
diff --git a/packages/tool-cache/__tests__/externals/zip-darwin b/packages/tool-cache/__tests__/externals/zip-darwin
deleted file mode 100755
index 60424b08..00000000
Binary files a/packages/tool-cache/__tests__/externals/zip-darwin and /dev/null differ
diff --git a/packages/tool-cache/__tests__/tool-cache.test.ts b/packages/tool-cache/__tests__/tool-cache.test.ts
index 35f90be1..ff85a200 100644
--- a/packages/tool-cache/__tests__/tool-cache.test.ts
+++ b/packages/tool-cache/__tests__/tool-cache.test.ts
@@ -287,9 +287,7 @@ describe('@actions/tool-cache', function() {
         ]
         await exec.exec(`"${powershellPath}"`, args)
       } else {
-        const zipBin: string =
-          process.platform === 'darwin' ? 'zip-darwin' : 'zip'
-        const zipPath: string = path.join(__dirname, 'externals', zipBin)
+        const zipPath: string = await io.which('zip')
         await exec.exec(`"${zipPath}`, [zipFile, '-r', '.'], {cwd: stagingDir})
       }
 
@@ -340,9 +338,7 @@ describe('@actions/tool-cache', function() {
         ]
         await exec.exec(`"${powershellPath}"`, args)
       } else {
-        const zipBin: string =
-          process.platform === 'darwin' ? 'zip-darwin' : 'zip'
-        const zipPath = path.join(__dirname, 'externals', zipBin)
+        const zipPath: string = await io.which('zip')
         await exec.exec(zipPath, [zipFile, '-r', '.'], {cwd: stagingDir})
       }
 
diff --git a/packages/tool-cache/package-lock.json b/packages/tool-cache/package-lock.json
index 9b7e0ed1..ffea2aa0 100644
--- a/packages/tool-cache/package-lock.json
+++ b/packages/tool-cache/package-lock.json
@@ -1,6 +1,6 @@
 {
 	"name": "@actions/tool-cache",
-	"version": "1.1.0",
+	"version": "1.1.1",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
diff --git a/packages/tool-cache/scripts/externals/unzip b/packages/tool-cache/scripts/externals/unzip
deleted file mode 100755
index 40824180..00000000
Binary files a/packages/tool-cache/scripts/externals/unzip and /dev/null differ
diff --git a/packages/tool-cache/scripts/externals/unzip-darwin b/packages/tool-cache/scripts/externals/unzip-darwin
deleted file mode 100755
index 4ef15045..00000000
Binary files a/packages/tool-cache/scripts/externals/unzip-darwin and /dev/null differ
diff --git a/packages/tool-cache/src/tool-cache.ts b/packages/tool-cache/src/tool-cache.ts
index 0dd556c3..9ab2deb5 100644
--- a/packages/tool-cache/src/tool-cache.ts
+++ b/packages/tool-cache/src/tool-cache.ts
@@ -223,11 +223,7 @@ export async function extractZip(file: string, dest?: string): Promise<string> {
   if (IS_WINDOWS) {
     await extractZipWin(file, dest)
   } else {
-    if (process.platform === 'darwin') {
-      await extractZipDarwin(file, dest)
-    } else {
-      await extractZipNix(file, dest)
-    }
+    await extractZipNix(file, dest)
   }
 
   return dest
@@ -255,18 +251,7 @@ async function extractZipWin(file: string, dest: string): Promise<void> {
 }
 
 async function extractZipNix(file: string, dest: string): Promise<void> {
-  const unzipPath = path.join(__dirname, '..', 'scripts', 'externals', 'unzip')
-  await exec(`"${unzipPath}"`, [file], {cwd: dest})
-}
-
-async function extractZipDarwin(file: string, dest: string): Promise<void> {
-  const unzipPath = path.join(
-    __dirname,
-    '..',
-    'scripts',
-    'externals',
-    'unzip-darwin'
-  )
+  const unzipPath = await io.which('unzip')
   await exec(`"${unzipPath}"`, [file], {cwd: dest})
 }