diff --git a/.github/workflows/installer.build.yml b/.github/workflows/installer.build.yml
index 04e3b076..be197ad1 100644
--- a/.github/workflows/installer.build.yml
+++ b/.github/workflows/installer.build.yml
@@ -1,7 +1,7 @@
 name: Build Installer
 
 on:
-  push:
+  pull_request:
     branches: 
       - main
       - 'release-*'
diff --git a/release-notes.md b/release-notes.md
index b525c331..78a5a6b9 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,3 +1,21 @@
+# Release 2.1.15
+
+## What's New
+* none
+
+## Other changes:
+* TCP retransmissions from intercepted clients are now much less likely, thanks to TSDK changes that limit the number of
+  pending written bytes (to the ziti connection) to 128k. TCP clients now experience back-pressure through the TCP receive
+  window for proper flow control.
+
+## Bugs fixed:
+* [TSDK bug 611](https://github.com/openziti/ziti-tunnel-sdk-c/issues/611) - Release packet buffers for unparsable dns queries. This bug would eventually result in "pbuf_alloc" failures, which prevented the tunneler from intercepting packets.
+* [CSDK PR 491](https://github.com/openziti/ziti-sdk-c/pull/491) - Avoid crash when writing to closed ziti connections.
+
+## Dependency Updates
+* Advanced Installer updated to 20.4.1
+* ziti-tunnel-sdk-c updated to v0.20.22/c sdk v0.31.2
+
 # Release 2.1.14
 
 ## What's New
diff --git a/version b/version
index 1b5105df..67da9540 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2.1.14
+2.1.15
diff --git a/ziti-edge-tunnel/build.bat b/ziti-edge-tunnel/build.bat
index 9556bf0b..858c9223 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=v0.20.20
+SET ZITI_TUNNEL_REPO_BRANCH=v0.20.22
 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