diff --git a/README.md b/README.md
index a68b89e..d3f9486 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ jobs:
 
 - `arch` – target architecture
   - native compilation:
-    - `x64` (default) or its synonyms: `amd64`, `win64`
+    - `x64` (default) or its synonyms: `amd64`, `win64`, `x86_64`
     - `x86` or its synonyms: `win32`
   - cross-compilation: `x86_amd64`, `x86_arm`, `x86_arm64`, `amd64_x86`, `amd64_arm`, `amd64_arm64`
 - `sdk` – Windows SDK to use
diff --git a/index.js b/index.js
index a5f9bd8..f4fbd73 100644
--- a/index.js
+++ b/index.js
@@ -90,6 +90,8 @@ function main() {
     let arch_aliases = {
         "win32": "x86",
         "win64": "x64",
+        "x86_64": "x64",
+        "x86-64": "x64",
     }
     // Ignore case when matching as that's what humans expect.
     if (arch.toLowerCase() in arch_aliases) {
diff --git a/node_modules/.package-lock.json b/node_modules/.package-lock.json
index d09ec06..776dbc4 100644
--- a/node_modules/.package-lock.json
+++ b/node_modules/.package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "msvc-dev-cmd",
-  "version": "1.8.1",
+  "version": "1.9.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package-lock.json b/package-lock.json
index 7f88284..fb3d5bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
   "name": "msvc-dev-cmd",
-  "version": "1.8.1",
+  "version": "1.9.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "1.8.1",
+      "version": "1.9.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.2"
diff --git a/package.json b/package.json
index 65c6d06..d555a9a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "msvc-dev-cmd",
-  "version": "1.8.1",
+  "version": "1.9.0",
   "description": "GitHub Action to setup Developer Command Prompt for Microsoft Visual C++",
   "main": "index.js",
   "scripts": {