diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8032c17..ed21d28 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.12.0"
+  ".": "0.13.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5bd3c2e..5906666 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## [0.13.0](https://github.com/agentclientprotocol/typescript-sdk/compare/v0.12.0...v0.13.0) (2026-01-13)
+
+
+### Features
+
+* (breaking) no more auto underscoring of extension methods ([#55](https://github.com/agentclientprotocol/typescript-sdk/issues/55)) ([ec4b095](https://github.com/agentclientprotocol/typescript-sdk/commit/ec4b0950ff5bcdfa60826e720c25575929d1f034))
+* add unstable session config option handling ([#56](https://github.com/agentclientprotocol/typescript-sdk/issues/56)) ([ec7bb47](https://github.com/agentclientprotocol/typescript-sdk/commit/ec7bb47628f2be505e8fe0f784674dc6573d2f15))
+* Update to 0.10.6 of the schema ([#53](https://github.com/agentclientprotocol/typescript-sdk/issues/53)) ([766964e](https://github.com/agentclientprotocol/typescript-sdk/commit/766964e29df567a4725911002c3184b0c19ec99a))
+
 ## [0.12.0](https://github.com/agentclientprotocol/typescript-sdk/compare/v0.11.0...v0.12.0) (2025-12-16)
 
 
diff --git a/package-lock.json b/package-lock.json
index 797d1b7..a463930 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@agentclientprotocol/sdk",
-  "version": "0.12.0",
+  "version": "0.13.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@agentclientprotocol/sdk",
-      "version": "0.12.0",
+      "version": "0.13.0",
       "license": "Apache-2.0",
       "devDependencies": {
         "@hey-api/openapi-ts": "^0.90.3",
diff --git a/package.json b/package.json
index 712371c..4bbdc80 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@agentclientprotocol/sdk",
-  "version": "0.12.0",
+  "version": "0.13.0",
   "publishConfig": {
     "access": "public"
   },