diff --git a/release-notes.md b/release-notes.md
index 78a5a6b9..10601d7d 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,3 +1,19 @@
+# Release 2.1.16
+
+## What's New
+* none
+
+## Other changes:
+* none
+
+## Bugs fixed:
+* none
+
+## Dependency Updates
+* ziti-tunnel-sdk-c updated to v0.20.23/c sdk v0.31.4
+  - fixes packet buffer leaks when ziti_write fails
+  - fixes several memory leaks
+
 # Release 2.1.15
 
 ## What's New
diff --git a/version b/version
index 67da9540..291d0de4 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2.1.15
+2.1.16
diff --git a/ziti-edge-tunnel/build.bat b/ziti-edge-tunnel/build.bat
index 858c9223..17db4f18 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=v0.20.22
+SET ZITI_TUNNEL_REPO_BRANCH=v0.20.23
 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