diff --git a/.github/workflows/e2e-cache.yml b/.github/workflows/e2e-cache.yml
index e7003319..fd0d4046 100644
--- a/.github/workflows/e2e-cache.yml
+++ b/.github/workflows/e2e-cache.yml
@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10, 12, 14]
+        node-version: [12, 14, 16]
     steps:
       - uses: actions/checkout@v2
       - name: Clean global cache
@@ -42,7 +42,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10, 12, 14]
+        node-version: [12, 14, 16]
     steps:
       - uses: actions/checkout@v2
       - name: Yarn version
@@ -72,7 +72,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10, 12, 14]
+        node-version: [12, 14, 16]
     steps:
       - uses: actions/checkout@v2
       - name: Update yarn
diff --git a/.github/workflows/proxy.yml b/.github/workflows/proxy.yml
index 6eaa1570..04e91797 100644
--- a/.github/workflows/proxy.yml
+++ b/.github/workflows/proxy.yml
@@ -30,12 +30,12 @@ jobs:
       - uses: actions/checkout@v2
       - name: Clear tool cache
         run: rm -rf $RUNNER_TOOL_CACHE/*
-      - name: Setup node 10
+      - name: Setup node 14
         uses: ./
         with:
-          node-version: 10.x
+          node-version: 14.x
       - name: Verify node and npm
-        run: __tests__/verify-node.sh 10
+        run: __tests__/verify-node.sh 14
 
   test-bypass-proxy:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/versions.yml b/.github/workflows/versions.yml
index b06471bd..cb2b210e 100644
--- a/.github/workflows/versions.yml
+++ b/.github/workflows/versions.yml
@@ -49,7 +49,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10.15, 12.16.0, 14.2.0]
+        node-version: [10.15, 12.16.0, 14.2.0, 16.3.0]
     steps:
       - uses: actions/checkout@v2
       - name: Setup Node
@@ -66,7 +66,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10, 11, 12, 14]
+        node-version: [10, 12, 14]
     steps:
       - uses: actions/checkout@v2
       - name: Setup Node and check latest
@@ -116,10 +116,10 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Setup node 12 x86 from dist
+      - name: Setup node 14 x86 from dist
         uses: ./
         with:
-          node-version: '12'
+          node-version: '14'
           architecture: 'x86'
       - name: Verify node
         run: __tests__/verify-arch.sh "ia32"
diff --git a/README.md b/README.md
index edd3ea65..e9a06d5a 100644
--- a/README.md
+++ b/README.md
@@ -26,16 +26,24 @@ steps:
 - run: npm test
 ```
 
-The `node-version` input is optional. If not supplied, the node version from PATH will be used. However, this action will still register problem matchers and support auth features. So setting up the node environment is still a valid scenario without downloading and caching versions.
+The `node-version` input is optional. If not supplied, the node version from PATH will be used. However, It is recommended to always specify Node.js version and don't rely on system one.  
 
 The action will first check the local cache for a semver match. If unable to find a specific version in the cache, the action will attempt to download a version of Node.js. It will pull LTS versions from [node-versions releases](https://github.com/actions/node-versions/releases) and on miss or failure will fall back to the previous behavior of downloading directly from [node dist](https://nodejs.org/dist/).
 
 For information regarding locally cached versions of Node.js on GitHub hosted runners, check out [GitHub Actions Virtual Environments](https://github.com/actions/virtual-environments).
 
+#### Supported version syntax
+The `node-version` input supports the following syntax:
+
+major versions: `12`, `14`, `16`  
+more specific versions: `10.15`, `14.2.0`, `16.3.0`  
+nvm lts syntax: `lts/erbium`, `lts/fermium`, `lts/*`  
+
 ### Caching packages dependencies
 
 The action has a built-in functionality for caching and restoring npm/yarn dependencies. Supported package managers are `npm`, `yarn`. The `cache` input is optional, and caching is turned off by default.
 
+**Caching npm dependencies:**
 ```yaml
 steps:
 - uses: actions/checkout@v2
@@ -69,7 +77,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ '12', '14' ]
+        node: [ '12', '14', '16' ]
     name: Node ${{ matrix.node }} sample
     steps:
       - uses: actions/checkout@v2
diff --git a/docs/advanced-usage.md b/docs/advanced-usage.md
index c9acacbb..6fa7bd4b 100644
--- a/docs/advanced-usage.md
+++ b/docs/advanced-usage.md
@@ -52,9 +52,9 @@ jobs:
           - macos-latest
           - windows-latest
         node_version:
-          - 10
           - 12
           - 14
+          - 16
         architecture:
           - x64
         # an extra windows-x86 run:
diff --git a/validate/test.sh b/validate/test.sh
deleted file mode 100755
index f066edb8..00000000
--- a/validate/test.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-
-#/bin/bash
-
-set -e
-
-rm -rf ./temp
-rm -rf ./node
-
-# uncomment to use charles proxy or other debugging proxy
-# export NODE_TLS_REJECT_UNAUTHORIZED=0
-# export https_proxy=http://127.0.0.1:8888
-
-export RUNNER_TOOL_CACHE=$(pwd)
-export RUNNER_TEMP="${RUNNER_TOOL_CACHE}/temp"
-export INPUT_STABLE=true
-export INPUT_VERSION="12"   #"0.12.7"  #"12" #"11.15.0"
-# export your PAT with repo scope before running
-export INPUT_TOKEN=$GITHUB_TOKEN
-
-echo "Getting ${INPUT_VERSION} ($INPUT_STABLE) with ${INPUT_TOKEN}..."
-
-node ../dist/index.js