diff --git a/.github/workflows/alpine.yml b/.github/workflows/alpine.yml
index 7aaf451dc..801788cbc 100644
--- a/.github/workflows/alpine.yml
+++ b/.github/workflows/alpine.yml
@@ -15,10 +15,10 @@ jobs:
       fail-fast: false
       matrix:
         node:
-          - 16
           - 18
           - 19
           - 20
+          - 21
 
     steps:
       - name: Install Alpine build tools
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 3f8939cc1..7dedf844f 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -14,10 +14,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - node: 16
-            gcc: "gcc-8"
-            gpp: "g++-8"
-            os: ubuntu-20.04
           - node: 18
             gcc: "gcc-8"
             gpp: "g++-8"
@@ -30,7 +26,10 @@ jobs:
             gcc: "gcc-10"
             gpp: "g++-10"
             os: ubuntu-22.04
-
+          - node: 21
+            gcc: "gcc-10"
+            gpp: "g++-10"
+            os: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 056e1cf3b..30cc77c40 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -14,10 +14,10 @@ jobs:
       fail-fast: false
       matrix:
         node:
-          - 16
           - 18
           - 19
           - 20
+          - 21
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 50528faec..3dac56559 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -14,10 +14,10 @@ jobs:
       fail-fast: false
       matrix:
         node:
-          - 16
           - 18
           - 19
           - 20
+          - 21
 
         architecture:
           - x64
diff --git a/README.md b/README.md
index 125dee83f..d82309c15 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ Below is a quick guide for minimum and maximum supported versions of node-sass:
 
 NodeJS  | Supported node-sass version | Node Module
 --------|-----------------------------|------------
+Node 21 | 9.0+                        | 119
 Node 20 | 9.0+                        | 115
 Node 19 | 8.0+                        | 111
 Node 18 | 8.0+                        | 108
diff --git a/appveyor.yml b/appveyor.yml
index 17e95edc6..8854fe01b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -33,9 +33,6 @@
   environment:
     SKIP_SASS_BINARY_DOWNLOAD_FOR_CI: true
     matrix:
-      - nodejs_version: 16
-        GYP_MSVS_VERSION: 2019
-        APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       - nodejs_version: 18
         GYP_MSVS_VERSION: 2019
         APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
@@ -45,6 +42,9 @@
       - nodejs_version: 20
         GYP_MSVS_VERSION: 2019
         APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      - nodejs_version: 21
+        GYP_MSVS_VERSION: 2019
+        APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
 
 
   install:
diff --git a/lib/extensions.js b/lib/extensions.js
index 24314b8bd..9873dc807 100644
--- a/lib/extensions.js
+++ b/lib/extensions.js
@@ -85,6 +85,7 @@ function getHumanNodeVersion(abi) {
     case 108: return 'Node.js 18.x';
     case 111: return 'Node.js 19.x';
     case 115: return 'Node.js 20.x';
+    case 120: return 'Node.js 21.x';
     default: return false;
   }
 }
@@ -111,7 +112,7 @@ function getHumanEnvironment(env) {
   }
 
   if (!platform) {
-    platform = 'Unsupported platform (' + parts[0] + ')';
+    platform = 'Unsupported platform (' + parts[0] + '/' + process.versions.modules + ')';
   }
 
   if (!arch) {