diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5be45c4..40b279b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Changed
-- `CLIInstaller::PINNED_CLI_VERSION` moves from 2.1.288 to **2.1.289**, following the CLI the Python SDK bundles. `CLIInstaller.install_pinned` installs it. See the [Claude Code changelog](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md).
+- `CLIInstaller::PINNED_CLI_VERSION` moves from 2.1.288 to **2.1.291**, following the CLI the Python SDK bundles. `CLIInstaller.install_pinned` installs it. See the [Claude Code changelog](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md).
 
 ## [1.2.1] - 2026-10-06
 
diff --git a/lib/claude_agent_sdk/cli_installer.rb b/lib/claude_agent_sdk/cli_installer.rb
index 044e9c9..25df00f 100644
--- a/lib/claude_agent_sdk/cli_installer.rb
+++ b/lib/claude_agent_sdk/cli_installer.rb
@@ -53,7 +53,7 @@ module CLIInstaller # rubocop:disable Metrics/ModuleLength -- Http/Platform/Rele
     # Single source of truth: bumped here (and only here) by
     # .github/workflows/cli-pin-bump.yml or a Python-sync release, so a
     # Dependabot bump of the gem carries the CLI forward with it.
-    PINNED_CLI_VERSION = '2.1.289'
+    PINNED_CLI_VERSION = '2.1.291'
     # @api private
     BINARY_NAME = 'claude'
     # @api private