diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a9d59ce..a6c6356 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, macos-10.15, windows-2016, windows-2019 ]
+        os: [ ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11.0, windows-2016, windows-2019 ]
         # Use various version syntax here for testing
         ruby: [ 2.1, 2.2, 2.3, 2.4, 2.5, 2.6.6, 2.7, ruby-head, debug, jruby-9.1, jruby, jruby-head, truffleruby, truffleruby-head ]
         include:
diff --git a/README.md b/README.md
index d7bd1f4..82e8bba 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ The action works for all [GitHub-hosted runners](https://help.github.com/en/acti
 | Operating System | Recommended | Other Supported Versions |
 | ----------- | -------- | -------- |
 | Ubuntu  | `ubuntu-latest`  (= `ubuntu-18.04`) | `ubuntu-20.04`, `ubuntu-16.04` |
-| macOS   | `macos-latest`   (= `macos-10.15`)  | |
+| macOS   | `macos-latest`   (= `macos-10.15`)  | `macos-11.0` |
 | Windows | `windows-latest` (= `windows-2019`) | `windows-2016` |
 
 The prebuilt releases are generated by [ruby-builder](https://github.com/ruby/ruby-builder)
diff --git a/common.js b/common.js
index 03e7101..4587abc 100644
--- a/common.js
+++ b/common.js
@@ -52,9 +52,9 @@ export function getVirtualEnvironmentName() {
     return `ubuntu-${match[1]}.04`
   }
 
-  match = imageOS.match(/^macos(\d{2})(\d+)/) // e.g. macos1015
+  match = imageOS.match(/^macos(\d{2})(\d+)?/) // e.g. macos1015, macos11
   if (match) {
-    return `macos-${match[1]}.${match[2]}`
+    return `macos-${match[1]}.${match[2] || '0'}`
   }
 
   match = imageOS.match(/^win(\d+)/) // e.g. win19
diff --git a/dist/index.js b/dist/index.js
index 440e66b..23dc791 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -32156,9 +32156,9 @@ function getVirtualEnvironmentName() {
     return `ubuntu-${match[1]}.04`
   }
 
-  match = imageOS.match(/^macos(\d{2})(\d+)/) // e.g. macos1015
+  match = imageOS.match(/^macos(\d{2})(\d+)?/) // e.g. macos1015, macos11
   if (match) {
-    return `macos-${match[1]}.${match[2]}`
+    return `macos-${match[1]}.${match[2] || '0'}`
   }
 
   match = imageOS.match(/^win(\d+)/) // e.g. win19