diff --git a/Cargo.lock b/Cargo.lock
index c5b8f3e..7601ba6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,7 +4,7 @@ version = 4
 
 [[package]]
 name = "agent-client-protocol"
-version = "0.12.0"
+version = "0.12.1"
 dependencies = [
  "agent-client-protocol-derive",
  "agent-client-protocol-schema",
@@ -30,7 +30,7 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol-conductor"
-version = "0.12.0"
+version = "0.12.1"
 dependencies = [
  "agent-client-protocol",
  "agent-client-protocol-polyfill",
@@ -79,7 +79,7 @@ dependencies = [
 
 [[package]]
 name = "agent-client-protocol-polyfill"
-version = "0.12.0"
+version = "0.12.1"
 dependencies = [
  "agent-client-protocol",
  "anyhow",
diff --git a/Cargo.toml b/Cargo.toml
index adaaa44..9a5c89c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,10 +25,10 @@ homepage = "https://github.com/agentclientprotocol/rust-sdk"
 
 [workspace.dependencies]
 # Internal crates
-agent-client-protocol = { path = "src/agent-client-protocol", version = "0.12.0" }
-agent-client-protocol-conductor = { path = "src/agent-client-protocol-conductor", version = "0.12.0" }
+agent-client-protocol = { path = "src/agent-client-protocol", version = "0.12.1" }
+agent-client-protocol-conductor = { path = "src/agent-client-protocol-conductor", version = "0.12.1" }
 agent-client-protocol-derive = { path = "src/agent-client-protocol-derive", version = "0.11.1" }
-agent-client-protocol-polyfill = { path = "src/agent-client-protocol-polyfill", version = "0.12.0" }
+agent-client-protocol-polyfill = { path = "src/agent-client-protocol-polyfill", version = "0.12.1" }
 agent-client-protocol-rmcp = { path = "src/agent-client-protocol-rmcp", version = "0.11.2" }
 agent-client-protocol-test = { path = "src/agent-client-protocol-test" }
 agent-client-protocol-trace-viewer = { path = "src/agent-client-protocol-trace-viewer", version = "0.11.1" }
diff --git a/src/agent-client-protocol-conductor/CHANGELOG.md b/src/agent-client-protocol-conductor/CHANGELOG.md
index 9699185..dbb292d 100644
--- a/src/agent-client-protocol-conductor/CHANGELOG.md
+++ b/src/agent-client-protocol-conductor/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.1](https://github.com/agentclientprotocol/rust-sdk/compare/agent-client-protocol-conductor-v0.12.0...agent-client-protocol-conductor-v0.12.1) - 2026-05-17
+
+### Fixed
+
+- *(polyfill)* bump version to 0.12.0 ([#168](https://github.com/agentclientprotocol/rust-sdk/pull/168))
+
 ## [0.12.0](https://github.com/agentclientprotocol/rust-sdk/compare/agent-client-protocol-conductor-v0.11.1...agent-client-protocol-conductor-v0.12.0) - 2026-05-16
 
 ### Added
diff --git a/src/agent-client-protocol-conductor/Cargo.toml b/src/agent-client-protocol-conductor/Cargo.toml
index d478179..b248723 100644
--- a/src/agent-client-protocol-conductor/Cargo.toml
+++ b/src/agent-client-protocol-conductor/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "agent-client-protocol-conductor"
-version = "0.12.0"
+version = "0.12.1"
 edition.workspace = true
 authors.workspace = true
 license.workspace = true
diff --git a/src/agent-client-protocol-polyfill/CHANGELOG.md b/src/agent-client-protocol-polyfill/CHANGELOG.md
index 09c9b99..310bfeb 100644
--- a/src/agent-client-protocol-polyfill/CHANGELOG.md
+++ b/src/agent-client-protocol-polyfill/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.1](https://github.com/agentclientprotocol/rust-sdk/compare/agent-client-protocol-polyfill-v0.12.0...agent-client-protocol-polyfill-v0.12.1) - 2026-05-17
+
+### Other
+
+- updated the following local packages: agent-client-protocol
+
 ## [0.12.0](https://github.com/agentclientprotocol/rust-sdk/releases/tag/agent-client-protocol-polyfill-v0.12.0) - 2026-05-16
 
 ### Added
diff --git a/src/agent-client-protocol-polyfill/Cargo.toml b/src/agent-client-protocol-polyfill/Cargo.toml
index 5b933da..08f1c40 100644
--- a/src/agent-client-protocol-polyfill/Cargo.toml
+++ b/src/agent-client-protocol-polyfill/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "agent-client-protocol-polyfill"
-version = "0.12.0"
+version = "0.12.1"
 edition.workspace = true
 authors.workspace = true
 license.workspace = true
diff --git a/src/agent-client-protocol/CHANGELOG.md b/src/agent-client-protocol/CHANGELOG.md
index 2583e08..f1aadd0 100644
--- a/src/agent-client-protocol/CHANGELOG.md
+++ b/src/agent-client-protocol/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 ## [Unreleased]
 
+## [0.12.1](https://github.com/agentclientprotocol/rust-sdk/compare/v0.12.0...v0.12.1) - 2026-05-17
+
+### Other
+
+- update Cargo.toml dependencies
+
 ## [0.12.0](https://github.com/agentclientprotocol/rust-sdk/compare/v0.11.1...v0.12.0) - 2026-05-16
 
 ### Added
diff --git a/src/agent-client-protocol/Cargo.toml b/src/agent-client-protocol/Cargo.toml
index 1662851..65e6a98 100644
--- a/src/agent-client-protocol/Cargo.toml
+++ b/src/agent-client-protocol/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "agent-client-protocol"
-version = "0.12.0"
+version = "0.12.1"
 edition.workspace = true
 authors.workspace = true
 license.workspace = true