diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 8e2e5f3..318bc67 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -11,13 +11,20 @@ jobs:
         config:
           - runs-on: ubuntu-latest
             node-version: '18.12.0' # LTS
+            CODE_TEST: 'test-legacy'
 
           - runs-on: ubuntu-latest
-            node-version: '18.18.0' # LTS (current)
+            node-version: '18.18.2' # LTS
+            CODE_TEST: 'test-legacy'
+
+          - runs-on: ubuntu-latest
+            node-version: '20.9.0' # LTS (current)
+            CODE_TEST: 'test-legacy'
             CODE_CHECK: 1
 
           - runs-on: ubuntu-latest
-            node-version: '20.8.0'
+            node-version: '21.1.0' # Latest
+            CODE_TEST: 'test'
 
     runs-on: ${{ matrix.config.runs-on }}
 
@@ -36,11 +43,11 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Test CJS
-        run: npm run test:cjs
-
       - name: Test ESM
-        run: npm run test:esm
+        run: npm run ${{ matrix.config.CODE_TEST }}:esm
+
+      - name: Test CJS
+        run: npm run ${{ matrix.config.CODE_TEST }}:cjs
 
       - name: Lint
         run: npm run lint
@@ -63,7 +70,7 @@ jobs:
       - name: Node
         uses: actions/setup-node@v3
         with:
-          node-version: '18.18.0'
+          node-version: '20.9.0'
           registry-url: https://registry.npmjs.org/
 
       - name: Dependencies
diff --git a/.nvmrc b/.nvmrc
index 02c8b48..f3f52b4 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-18.18.0
+20.9.0
diff --git a/package.json b/package.json
index 726edef..e5f2aa0 100644
--- a/package.json
+++ b/package.json
@@ -43,9 +43,15 @@
 		"build:esm": "babel --env-name esm -x .ts -s true -d esm --out-file-extension .mjs src",
 		"build:cjs": "babel --env-name cjs -x .ts -s true -d cjs --out-file-extension .js src",
 		"build": "npm run build:dts && npm run build:esm && npm run build:cjs",
-		"test:esm": "node -r source-map-support/register --test esm",
-		"test:cjs": "node -r source-map-support/register --test cjs",
+		"test-legacy:esm": "node -r source-map-support/register --test esm",
+		"test-legacy:cjs": "node -r source-map-support/register --test cjs",
+		"test-legacy": "npm run test-legacy:esm && npm run test-legacy:cjs",
+		"test:esm": "node -r source-map-support/register --test 'esm/**/*.mjs'",
+		"test:cjs": "node -r source-map-support/register --test 'cjs/**/*.js'",
 		"test": "npm run test:esm && npm run test:cjs",
+		"all-legacy:esm": "npm run clean && npm run build:esm && npm run test-legacy:esm && npm run lint && npm run formatted",
+		"all-legacy:cjs": "npm run clean && npm run build:cjs && npm run test-legacy:cjs && npm run lint && npm run formatted",
+		"all-legacy": "npm run clean && npm run build && npm run test-legacy && npm run lint && npm run formatted",
 		"all:esm": "npm run clean && npm run build:esm && npm run test:esm && npm run lint && npm run formatted",
 		"all:cjs": "npm run clean && npm run build:cjs && npm run test:cjs && npm run lint && npm run formatted",
 		"all": "npm run clean && npm run build && npm run test && npm run lint && npm run formatted",