diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e9e6c88..a6f5306 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node-version: [10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x, 17.x, 18.x, 19.x]
+        node-version: [10.x, 12.x, 14.x, 16.x, 17.x, 18.x, 19.x]
         include:
           - os: macos-latest
             node-version: 14.x
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3254976..e50b4cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -80,6 +80,7 @@ For major (breaking) changes - **version 4, 3 and 2** - see end of page.
 
 | Version | Date       | Comment                                                                                             |
 | ------- | ---------- | --------------------------------------------------------------------------------------------------- |
+| 5.12.12 | 2022-11-03 | fix typescript typings                                                                              |
 | 5.12.11 | 2022-10-27 | `wifiInterfaces()`, `wifiConnections` improved parsing (linux)                                      |
 | 5.12.10 | 2022-10-25 | `bluetooth()` adapted parsing to accept also new profile (mac OS)                                   |
 | 5.12.9  | 2022-10-24 | fix typescript typings, code cleanup, docs updated                                                  |
diff --git a/docs/history.html b/docs/history.html
index 3d8e2bd..4390513 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -57,6 +57,11 @@
                     </tr>
                   </thead>
                   <tbody>
+                    <tr>
+                      <th scope="row">5.12.12</th>
+                      <td>2022-11-03</td>
+                      <td>fix typescript typings</td>
+                    </tr>
                     <tr>
                       <th scope="row">5.12.11</th>
                       <td>2022-10-27</td>
@@ -2784,4 +2789,4 @@
 
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/docs/index.html b/docs/index.html
index c2515ee..e538a91 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png" alt="logo">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.12.11</span></div>
+      <div class="version">New Version: <span id="version">5.12.12</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
diff --git a/lib/index.d.ts b/lib/index.d.ts
index b519397..a35886a 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -499,8 +499,8 @@ export namespace Systeminformation {
     operstate: string;
     type: string;
     duplex: string;
-    mtu: number;
-    speed: number;
+    mtu: number | null;
+    speed: number | null;
     dhcp: boolean;
     dnsSuffix: string;
     ieee8021xAuth: string;