diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f091af0b..a56438f13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,21 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.27.0] - 2026-08-12
+
+### Added
+- feat: August 12 release — evaluator OpenResponses, insights KMS, recommendation trace sources (#1981) (de227a14)
+
+### Fixed
+- fix: remove duplicate canary failure notification (#1959) (c00bf7ab)
+- fix(audit): address high security audit (#1952) (523257e1)
+- fix(schema): refresh llm-compacted context (#1894) (c4e1ff77)
+- fix: resolve npm audit vulnerabilities in production dependencies (#1918) (478e8012)
+
+### Other Changes
+- chore: skip guardrail test in e2e test suite (#1984) (3da34485)
+- ci: add Slack PR review notification caller (#1947) (6fb2b5db)
+
 ## [0.26.0] - 2026-08-04
 
 ### Added
diff --git a/package.json b/package.json
index 984e76cf5..11f20c73d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@aws/agentcore",
-  "version": "0.26.0",
+  "version": "0.27.0",
   "description": "CLI for Amazon Bedrock AgentCore",
   "license": "Apache-2.0",
   "repository": {
diff --git a/preview-version.json b/preview-version.json
index 0778c0cb9..a8a39a137 100644
--- a/preview-version.json
+++ b/preview-version.json
@@ -1,3 +1,3 @@
 {
-  "version": "1.0.0-preview.25"
+  "version": "1.0.0-preview.26"
 }
diff --git a/schemas/agentcore.schema.v1.json b/schemas/agentcore.schema.v1.json
index 689343cf2..e2ba419b1 100644
--- a/schemas/agentcore.schema.v1.json
+++ b/schemas/agentcore.schema.v1.json
@@ -1082,9 +1082,15 @@
               "llmAsAJudge": {
                 "type": "object",
                 "properties": {
+                  "modelProvider": {
+                    "type": "string",
+                    "enum": ["Bedrock", "OpenResponses"]
+                  },
                   "model": {
                     "type": "string",
-                    "minLength": 1
+                    "minLength": 1,
+                    "maxLength": 2048,
+                    "pattern": "^[\\x21-\\x7e]+$"
                   },
                   "instructions": {
                     "type": "string",