diff --git a/release-notes.md b/release-notes.md
index 915af02c..c3594462 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,3 +1,18 @@
+# Release 2.1.13
+
+## What's New
+* none
+
+## Other changes:
+* none
+
+## Bugs fixed:
+* [TSDK bug 585](https://github.com/openziti/ziti-tunnel-sdk-c/issues/585) - fix dns queries that contain '_', e.g. SRV lookups
+* [CSDK bug 478](https://github.com/openziti/ziti-sdk-c/issues/478) - avoid disconnecting active channel due to latency timeout
+
+## Dependency Updates
+* TSDK updated to 0.20.18 / CSDK 0.30.9
+
 # Release 2.1.12
 
 ## What's New
diff --git a/version b/version
index 348fc11e..ea4bd0fb 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2.1.12
+2.1.13
diff --git a/ziti-edge-tunnel/build.bat b/ziti-edge-tunnel/build.bat
index 589c88b9..b8a70ce2 100644
--- a/ziti-edge-tunnel/build.bat
+++ b/ziti-edge-tunnel/build.bat
@@ -14,7 +14,7 @@ REM See the License for the specific language governing permissions and
 REM limitations under the License.
 REM
 SET REPO_URL=https://github.com/openziti/ziti-tunnel-sdk-c.git
-SET ZITI_TUNNEL_REPO_BRANCH=v0.20.16
+SET ZITI_TUNNEL_REPO_BRANCH=v0.20.18
 REM override the c sdk used in the build - leave blank for the same as specified in the tunneler sdk
 SET ZITI_SDK_C_BRANCH=
 SET ZITI_TUNNEL_REPO_URL=https://github.com/openziti/ziti-tunnel-sdk-c/releases/latest/download/ziti-edge-tunnel-Windows_x86_64.zip