diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..30ddbbb
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.js text eol=lf
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 06bcc68..e7be683 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,26 +1,21 @@
-on: push
+name: Run tests
 
-jobs:
-  test:
-    name: test
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        node: [^12, ^14, ^16, ^18]
-        os: [ubuntu-latest, windows-latest, macos-latest]
-
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-
-      - name: node
-        uses: actions/setup-node@v2
-        with:
-          node-version: ${{ matrix.node }}
+on:
+    push:
+    pull_request:
 
-      - name: install
-        run: npm install
-
-      - name: test
-        run: npm test
+jobs:
+    test:
+        strategy:
+            matrix:
+                node: [12.x, 14.x, 16.x, 18.x]
+                os: [ubuntu-latest, macos-latest, windows-latest]
+        runs-on: ${{ matrix.os }}
+        steps:
+            - uses: actions/checkout@v2
+            - name: Use Node.js ${{ matrix.node }}
+              uses: actions/setup-node@v1
+              with:
+                  node-version: ${{ matrix.node }}
+            - run: npm install
+            - run: npm test
diff --git a/lib/smtp-connection.js b/lib/smtp-connection.js
index dcfc0b3..a8fc2f2 100644
--- a/lib/smtp-connection.js
+++ b/lib/smtp-connection.js
@@ -326,10 +326,7 @@ class SMTPConnection extends EventEmitter {
      */
     _onClose(/* hadError */) {
         if (this._parser) {
-            // node 18 makes this a getter-only property, handled internally 
-            if (this._parser.canSetClosedProp) {
-                this._parser.closed = true;
-            }
+            this._parser.isClosed = true;
             this._socket.unpipe(this._parser);
             this._parser = false;
         }
diff --git a/lib/smtp-stream.js b/lib/smtp-stream.js
index 83502d3..b7c2a9a 100755
--- a/lib/smtp-stream.js
+++ b/lib/smtp-stream.js
@@ -31,25 +31,12 @@ class SMTPStream extends Writable {
         // unprocessed bytes from the last parsing iteration (used in data mode)
         this._lastBytes = false;
 
-        // node 18 makes this a getter-only property, handled internally 
-        if (this.canSetClosedProp) {
-            this.closed = false;
-        }
+        this.isClosed = false;
 
         // once the input stream ends, flush all output without expecting the newline
         this.on('finish', () => this._flushData());
     }
 
-    get canSetClosedProp() {
-        try {
-            const { closed } = this;
-            this.closed = closed;
-            return true;
-        } catch (err) {
-            return false;
-        }
-    }
-
     /**
      * Placeholder command handler. Override this with your own.
      */
@@ -107,7 +94,7 @@ class SMTPStream extends Writable {
             next(...args);
         };
 
-        if (this.closed) {
+        if (this.isClosed) {
             return done();
         }
 
@@ -245,7 +232,7 @@ class SMTPStream extends Writable {
      */
     _flushData() {
         let line;
-        if (this._remainder && !this.closed) {
+        if (this._remainder && !this.isClosed) {
             line = this._remainder;
             this._remainder = '';
             this.oncommand(Buffer.from(line, 'binary'));
diff --git a/package.json b/package.json
index 725778a..22c557d 100644
--- a/package.json
+++ b/package.json
@@ -11,17 +11,17 @@
     "dependencies": {
         "base32.js": "0.1.0",
         "ipv6-normalize": "1.0.1",
-        "nodemailer": "6.7.2"
+        "nodemailer": "6.7.3"
     },
     "devDependencies": {
         "chai": "4.3.6",
         "eslint-config-nodemailer": "1.2.0",
-        "eslint-config-prettier": "8.4.0",
-        "grunt": "1.4.1",
+        "eslint-config-prettier": "8.5.0",
+        "grunt": "1.5.2",
         "grunt-cli": "1.4.3",
         "grunt-eslint": "24.0.0",
         "grunt-mocha-test": "0.13.3",
-        "mocha": "9.2.1",
+        "mocha": "9.2.2",
         "pem": "1.14.6"
     },
     "repository": {