diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9b6b4611c..7732316ae 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  ".": "0.20.0",
-  "packages/streamlib-moq": "0.1.6",
-  "packages/streamlib-webrtc": "0.1.1"
+  ".": "0.21.0",
+  "packages/streamlib-moq": "0.2.0",
+  "packages/streamlib-webrtc": "0.2.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bd2d830ef..458fccb5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [0.21.0](https://github.com/tatolab/streamlib/compare/v0.20.0...v0.21.0) (2026-09-11)
+
+
+### ⚠ BREAKING CHANGES
+
+* **wheel:** keyword-argument configuration is deleted. A processor's `__init__` takes one `config` parameter annotated with its config class, or nothing beyond `self`; any other signature is refused at decoration.
+
+### Features
+
+* **wheel:** a Python processor's config is one class named by its __init__ annotation ([#2226](https://github.com/tatolab/streamlib/issues/2226)) ([9033ca9](https://github.com/tatolab/streamlib/commit/9033ca9b06fb292ae63f8a7d8d4a26a57d04e351))
+
 ## [0.20.0](https://github.com/tatolab/streamlib/compare/v0.19.2...v0.20.0) (2026-09-11)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index b28a01212..3c9d58111 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4158,7 +4158,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "serde",
  "serde_json",
@@ -4167,7 +4167,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-adapter-cpu-readback"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "serde",
@@ -4186,7 +4186,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-adapter-cuda"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "cudarc",
  "dlpark",
@@ -4207,7 +4207,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-adapter-opengl"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "gl",
  "khronos-egl",
@@ -4230,7 +4230,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-adapter-skia"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "libloading 0.8.9",
@@ -4253,7 +4253,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-adapter-vulkan"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "serde",
@@ -4300,7 +4300,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-consumer-rhi"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "streamlib-surface-client",
@@ -4311,7 +4311,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-engine"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "ahash",
  "anyhow",
@@ -4393,7 +4393,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-error"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "anyhow",
  "streamlib-consumer-rhi",
@@ -4403,7 +4403,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-ipc-types"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "iceoryx2",
  "tracing",
@@ -4411,7 +4411,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-macros"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "crossbeam-channel",
  "proc-macro-crate",
@@ -4424,7 +4424,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-media-builtins"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "mp4",
@@ -4443,7 +4443,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-processor-schema"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "rmp-serde",
  "schemars",
@@ -4456,7 +4456,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-python-wheel"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "cudarc",
  "libc",
@@ -4477,7 +4477,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-surface-adapter"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "bitflags 2.11.0",
  "libc",
@@ -4488,7 +4488,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-surface-client"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "libc",
  "serde_json",
@@ -4497,7 +4497,7 @@ dependencies = [
 
 [[package]]
 name = "streamlib-test-fixtures"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "serde",
  "serde_json",
@@ -5152,7 +5152,7 @@ dependencies = [
 
 [[package]]
 name = "vulkan-jpeg"
-version = "0.20.0"
+version = "0.21.0"
 dependencies = [
  "bytemuck",
  "jpeg-encoder",
diff --git a/Cargo.toml b/Cargo.toml
index d7b9ee6e1..377506d90 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,7 +39,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.20.0"
+version = "0.21.0"
 edition = "2024"
 rust-version = "1.88"
 authors = ["Jonathan Fontanez <fontanezj1@gmail.com>"]
diff --git a/adapters/streamlib-adapter-cpu-readback/Cargo.toml b/adapters/streamlib-adapter-cpu-readback/Cargo.toml
index 8f8b61136..cf6437478 100644
--- a/adapters/streamlib-adapter-cpu-readback/Cargo.toml
+++ b/adapters/streamlib-adapter-cpu-readback/Cargo.toml
@@ -15,13 +15,13 @@ name = "streamlib_adapter_cpu_readback"
 path = "src/lib.rs"
 
 [dependencies]
-streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.21.0" }
 thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
 vulkanalia.workspace = true
 libc.workspace = true
 serde = { workspace = true }
diff --git a/adapters/streamlib-adapter-cuda/Cargo.toml b/adapters/streamlib-adapter-cuda/Cargo.toml
index 046fa323a..96bf6e31a 100644
--- a/adapters/streamlib-adapter-cuda/Cargo.toml
+++ b/adapters/streamlib-adapter-cuda/Cargo.toml
@@ -33,13 +33,13 @@ cuda = ["dep:cudarc"]
 # spec's `#[repr(C)]` types, and off-Linux consumers (the wheel's CPU
 # capsule path) need exactly it.
 dlpark.workspace = true
-streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.21.0" }
 thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
 vulkanalia.workspace = true
 libc.workspace = true
 cudarc = { workspace = true, optional = true }
diff --git a/adapters/streamlib-adapter-opengl/Cargo.toml b/adapters/streamlib-adapter-opengl/Cargo.toml
index 3ecd7af1f..5d4e1c385 100644
--- a/adapters/streamlib-adapter-opengl/Cargo.toml
+++ b/adapters/streamlib-adapter-opengl/Cargo.toml
@@ -15,14 +15,14 @@ name = "streamlib_adapter_opengl"
 path = "src/lib.rs"
 
 [dependencies]
-streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.21.0" }
 parking_lot = "0.12"
 thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
 khronos-egl = { version = "6.0", features = ["dynamic"] }
 gl = "0.14"
 libc.workspace = true
diff --git a/adapters/streamlib-adapter-skia/Cargo.toml b/adapters/streamlib-adapter-skia/Cargo.toml
index 29f9c6153..d2389d615 100644
--- a/adapters/streamlib-adapter-skia/Cargo.toml
+++ b/adapters/streamlib-adapter-skia/Cargo.toml
@@ -15,14 +15,14 @@ name = "streamlib_adapter_skia"
 path = "src/lib.rs"
 
 [dependencies]
-streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.21.0" }
 thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-adapter-vulkan = { path = "../streamlib-adapter-vulkan", version = "0.20.0" }
-streamlib-adapter-opengl = { path = "../streamlib-adapter-opengl", version = "0.20.0" }
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
+streamlib-adapter-vulkan = { path = "../streamlib-adapter-vulkan", version = "0.21.0" }
+streamlib-adapter-opengl = { path = "../streamlib-adapter-opengl", version = "0.21.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
 vulkanalia.workspace = true
 skia-safe = { workspace = true }
 # vkGetInstanceProcAddr lives on vulkanalia's private StaticCommands;
@@ -36,7 +36,7 @@ libloading = "0.8"
 # live under regular `[dependencies]` rather than `[dev-dependencies]`
 # because Cargo's `[[bin]]` targets don't see dev-deps. Same shape as
 # `streamlib-adapter-opengl/Cargo.toml`.
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
 serde = { workspace = true }
 serde_json.workspace = true
 libc.workspace = true
diff --git a/adapters/streamlib-adapter-vulkan/Cargo.toml b/adapters/streamlib-adapter-vulkan/Cargo.toml
index 9d1561e8f..ff35584b1 100644
--- a/adapters/streamlib-adapter-vulkan/Cargo.toml
+++ b/adapters/streamlib-adapter-vulkan/Cargo.toml
@@ -15,13 +15,13 @@ name = "streamlib_adapter_vulkan"
 path = "src/lib.rs"
 
 [dependencies]
-streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../streamlib-surface-adapter", version = "0.21.0" }
 thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
 vulkanalia.workspace = true
 libc.workspace = true
 serde = { workspace = true }
diff --git a/packages/streamlib-moq/CHANGELOG.md b/packages/streamlib-moq/CHANGELOG.md
index 3fbe5e287..8e47542f8 100644
--- a/packages/streamlib-moq/CHANGELOG.md
+++ b/packages/streamlib-moq/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [0.2.0](https://github.com/tatolab/streamlib/compare/streamlib-moq-v0.1.6...streamlib-moq-v0.2.0) (2026-09-11)
+
+
+### ⚠ BREAKING CHANGES
+
+* **wheel:** keyword-argument configuration is deleted. A processor's `__init__` takes one `config` parameter annotated with its config class, or nothing beyond `self`; any other signature is refused at decoration.
+
+### Features
+
+* **wheel:** a Python processor's config is one class named by its __init__ annotation ([#2226](https://github.com/tatolab/streamlib/issues/2226)) ([9033ca9](https://github.com/tatolab/streamlib/commit/9033ca9b06fb292ae63f8a7d8d4a26a57d04e351))
+
 ## [0.1.6](https://github.com/tatolab/streamlib/compare/streamlib-moq-v0.1.5...streamlib-moq-v0.1.6) (2026-09-06)
 
 
diff --git a/packages/streamlib-moq/Cargo.lock b/packages/streamlib-moq/Cargo.lock
index 624cb6463..d38e87d85 100644
--- a/packages/streamlib-moq/Cargo.lock
+++ b/packages/streamlib-moq/Cargo.lock
@@ -1607,7 +1607,7 @@ checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
 [[package]]
 name = "streamlib-moq"
-version = "0.1.6"
+version = "0.2.0"
 dependencies = [
  "bytes",
  "libc",
diff --git a/packages/streamlib-moq/Cargo.toml b/packages/streamlib-moq/Cargo.toml
index 3421ff393..4e1827645 100644
--- a/packages/streamlib-moq/Cargo.toml
+++ b/packages/streamlib-moq/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "streamlib-moq"
-version = "0.1.6"
+version = "0.2.0"
 edition = "2024"
 rust-version = "1.88"
 authors = ["Jonathan Fontanez <fontanezj1@gmail.com>"]
diff --git a/packages/streamlib-moq/pyproject.toml b/packages/streamlib-moq/pyproject.toml
index a2422bdad..2ef9725c0 100644
--- a/packages/streamlib-moq/pyproject.toml
+++ b/packages/streamlib-moq/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "streamlib-moq"
-version = "0.1.6"
+version = "0.2.0"
 description = "Media over QUIC publish and subscribe for StreamLib."
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/packages/streamlib-webrtc/CHANGELOG.md b/packages/streamlib-webrtc/CHANGELOG.md
index 5cc8d2089..668781ed7 100644
--- a/packages/streamlib-webrtc/CHANGELOG.md
+++ b/packages/streamlib-webrtc/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [0.2.0](https://github.com/tatolab/streamlib/compare/streamlib-webrtc-v0.1.1...streamlib-webrtc-v0.2.0) (2026-09-11)
+
+
+### ⚠ BREAKING CHANGES
+
+* **wheel:** keyword-argument configuration is deleted. A processor's `__init__` takes one `config` parameter annotated with its config class, or nothing beyond `self`; any other signature is refused at decoration.
+
+### Features
+
+* **wheel:** a Python processor's config is one class named by its __init__ annotation ([#2226](https://github.com/tatolab/streamlib/issues/2226)) ([9033ca9](https://github.com/tatolab/streamlib/commit/9033ca9b06fb292ae63f8a7d8d4a26a57d04e351))
+
 ## [0.1.1](https://github.com/tatolab/streamlib/compare/streamlib-webrtc-v0.1.0...streamlib-webrtc-v0.1.1) (2026-09-05)
 
 
diff --git a/packages/streamlib-webrtc/Cargo.lock b/packages/streamlib-webrtc/Cargo.lock
index cfd952bae..46242851a 100644
--- a/packages/streamlib-webrtc/Cargo.lock
+++ b/packages/streamlib-webrtc/Cargo.lock
@@ -2031,7 +2031,7 @@ checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
 [[package]]
 name = "streamlib-webrtc"
-version = "0.1.1"
+version = "0.2.0"
 dependencies = [
  "bytes",
  "http-body-util",
diff --git a/packages/streamlib-webrtc/Cargo.toml b/packages/streamlib-webrtc/Cargo.toml
index a3eb63d64..2a753080b 100644
--- a/packages/streamlib-webrtc/Cargo.toml
+++ b/packages/streamlib-webrtc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "streamlib-webrtc"
-version = "0.1.1"
+version = "0.2.0"
 edition = "2024"
 rust-version = "1.88"
 authors = ["Jonathan Fontanez <fontanezj1@gmail.com>"]
diff --git a/packages/streamlib-webrtc/pyproject.toml b/packages/streamlib-webrtc/pyproject.toml
index 16f91c6f3..cade463ac 100644
--- a/packages/streamlib-webrtc/pyproject.toml
+++ b/packages/streamlib-webrtc/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "streamlib-webrtc"
-version = "0.1.1"
+version = "0.2.0"
 description = "WHIP publish and WHEP play for StreamLib."
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/packages/test-fixtures/Cargo.toml b/packages/test-fixtures/Cargo.toml
index 4653c05c5..abb30a4f2 100644
--- a/packages/test-fixtures/Cargo.toml
+++ b/packages/test-fixtures/Cargo.toml
@@ -18,11 +18,11 @@ crate-type = ["rlib"]
 
 [dependencies]
 # Engine substrate — runtime context and processor traits.
-streamlib = { path = "../../sdk/streamlib-sdk", version = "0.20.0" }
+streamlib = { path = "../../sdk/streamlib-sdk", version = "0.21.0" }
 
 # Procedural macros — `#[streamlib::sdk::processor("...")]` reads the
 # crate's own `streamlib.yaml` at `CARGO_MANIFEST_DIR`.
-streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.20.0" }
+streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.21.0" }
 
 
 # Serialization (config dataclass ships as serde-derived).
diff --git a/runtime/streamlib-api-server/Cargo.toml b/runtime/streamlib-api-server/Cargo.toml
index e72e00e0f..11809bdc1 100644
--- a/runtime/streamlib-api-server/Cargo.toml
+++ b/runtime/streamlib-api-server/Cargo.toml
@@ -25,8 +25,8 @@ name = "generate_openapi"
 path = "src/bin/generate_openapi.rs"
 
 [dependencies]
-streamlib = { path = "../../sdk/streamlib-sdk", version = "0.20.0" }
-streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.20.0" }
+streamlib = { path = "../../sdk/streamlib-sdk", version = "0.21.0" }
+streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.21.0" }
 
 tower-http = { version = "0.6", features = ["trace"] }
 futures-util = "0.3"
@@ -58,7 +58,7 @@ percent-encoding = "2.3"
 # Enables the engine's `test-support` in-memory `TapSubscription` constructor
 # for the MCP/REST tap-tool tests. A dev-dep feature: active for tests, absent
 # from the production `cargo build` dependency graph.
-streamlib = { path = "../../sdk/streamlib-sdk", version = "0.20.0", features = ["test-support"] }
+streamlib = { path = "../../sdk/streamlib-sdk", version = "0.21.0", features = ["test-support"] }
 tempfile = "3"
 tower = {version = "0.5", features = ["util"]}
 serial_test = "3.2"
diff --git a/runtime/streamlib-consumer-rhi/Cargo.toml b/runtime/streamlib-consumer-rhi/Cargo.toml
index b1914a070..a36b1de52 100644
--- a/runtime/streamlib-consumer-rhi/Cargo.toml
+++ b/runtime/streamlib-consumer-rhi/Cargo.toml
@@ -19,7 +19,7 @@ thiserror.workspace = true
 tracing.workspace = true
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-surface-client = { path = "../streamlib-surface-client", version = "0.20.0" }
+streamlib-surface-client = { path = "../streamlib-surface-client", version = "0.21.0" }
 vulkanalia.workspace = true
 libc.workspace = true
 
diff --git a/runtime/streamlib-engine/Cargo.toml b/runtime/streamlib-engine/Cargo.toml
index 369ba33ae..735e8a98d 100644
--- a/runtime/streamlib-engine/Cargo.toml
+++ b/runtime/streamlib-engine/Cargo.toml
@@ -45,15 +45,15 @@ clear_bitstream_buffers_on_create = []
 
 [dependencies]
 # Processor schema types (shared with macros for code generation)
-streamlib-processor-schema = { path = "../../sdk/streamlib-processor-schema", version = "0.20.0", features = ["utoipa"] }
+streamlib-processor-schema = { path = "../../sdk/streamlib-processor-schema", version = "0.21.0", features = ["utoipa"] }
 
 # Canonical Error / Result / PortDirection, shared with the plugin-SDK so
 # plugin cdylibs author against them without linking the engine. The engine
 # re-exports them at `core::error`.
-streamlib-error = { path = "../../sdk/streamlib-error", version = "0.20.0" }
+streamlib-error = { path = "../../sdk/streamlib-error", version = "0.21.0" }
 
 # Procedural macros
-streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.20.0" }
+streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.21.0" }
 
 # Plugin ABI wire-protocol header. Dep direction reversed in #877:
 # streamlib-plugin-abi no longer depends on streamlib (the SDK), so the
@@ -62,7 +62,7 @@ streamlib-macros = { path = "../../sdk/streamlib-macros", version = "0.20.0" }
 # `STREAMLIB_ABI_VERSION` from this crate directly.
 
 # Shared iceoryx2 payload types (for cross-process IPC)
-streamlib-ipc-types = { path = "../streamlib-ipc-types", version = "0.20.0" }
+streamlib-ipc-types = { path = "../streamlib-ipc-types", version = "0.21.0" }
 
 # Consumer-side carve-out — owns the format primitives
 # (TextureFormat / TextureUsages / PixelFormat), the trait machinery
@@ -70,7 +70,7 @@ streamlib-ipc-types = { path = "../streamlib-ipc-types", version = "0.20.0" }
 # Consumer* RHI types (Linux), and a slim ConsumerRhiError. streamlib
 # re-exports the primitives so existing in-tree call sites (e.g.
 # `crate::core::rhi::TextureFormat`) keep working unchanged.
-streamlib-consumer-rhi = { path = "../streamlib-consumer-rhi", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../streamlib-consumer-rhi", version = "0.21.0" }
 
 # Core dependencies (always included)
 thiserror.workspace = true
@@ -159,7 +159,7 @@ raw-window-handle = "0.6"  # Raw window handle types for Vulkan surface creation
 # privileged syscall on the requesting thread's behalf.
 zbus = "5"
 # Wire-format helpers for the per-runtime surface-sharing socket
-streamlib-surface-client = { path = "../streamlib-surface-client", version = "0.20.0" }
+streamlib-surface-client = { path = "../streamlib-surface-client", version = "0.21.0" }
 # The extern "C" panic net (run_host_extern_c) every host_services callback
 # routes through.
 # Consumer-side carve-out — defines the trait machinery
@@ -168,7 +168,7 @@ streamlib-surface-client = { path = "../streamlib-surface-client", version = "0.
 # host side. streamlib re-exports for in-tree consumers; subprocess
 # cdylibs depend on it directly so the FullAccess capability boundary
 # is enforced by the type system.
-streamlib-consumer-rhi = { path = "../streamlib-consumer-rhi", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../streamlib-consumer-rhi", version = "0.21.0" }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-foundation = "0.9"
@@ -203,7 +203,7 @@ trybuild = "1.0.121"
 # `testing::SubprocessCrashHarness` — drives a real subprocess crash against
 # the surface-share service. Tests only: the engine's library code carries no
 # surface-adapter types.
-streamlib-surface-adapter = { path = "../../adapters/streamlib-surface-adapter", version = "0.20.0" }
+streamlib-surface-adapter = { path = "../../adapters/streamlib-surface-adapter", version = "0.21.0" }
 
 [[bench]]
 name = "logging"
diff --git a/runtime/streamlib-media-builtins/Cargo.toml b/runtime/streamlib-media-builtins/Cargo.toml
index 12afcbfbc..3282712a2 100644
--- a/runtime/streamlib-media-builtins/Cargo.toml
+++ b/runtime/streamlib-media-builtins/Cargo.toml
@@ -15,7 +15,7 @@ name = "streamlib_media_builtins"
 path = "src/lib.rs"
 
 [dependencies]
-streamlib = { path = "../../sdk/streamlib-sdk", version = "0.20.0", default-features = false }
+streamlib = { path = "../../sdk/streamlib-sdk", version = "0.21.0", default-features = false }
 serde = { workspace = true }
 serde_bytes = { workspace = true }
 rmp-serde = { workspace = true }
diff --git a/sdk/streamlib-error/Cargo.toml b/sdk/streamlib-error/Cargo.toml
index 1b9831b18..2028b4d57 100644
--- a/sdk/streamlib-error/Cargo.toml
+++ b/sdk/streamlib-error/Cargo.toml
@@ -17,10 +17,10 @@ path = "src/lib.rs"
 [dependencies]
 thiserror.workspace = true
 anyhow.workspace = true
-streamlib-processor-schema = { path = "../streamlib-processor-schema", version = "0.20.0" }
+streamlib-processor-schema = { path = "../streamlib-processor-schema", version = "0.21.0" }
 
 [target.'cfg(target_os = "linux")'.dependencies]
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
 
 [lints]
 workspace = true
diff --git a/sdk/streamlib-macros/Cargo.toml b/sdk/streamlib-macros/Cargo.toml
index 7243110bc..d3d4fa91d 100644
--- a/sdk/streamlib-macros/Cargo.toml
+++ b/sdk/streamlib-macros/Cargo.toml
@@ -19,7 +19,7 @@ proc-macro2 = "1.0"
 proc-macro-crate = "3"
 
 # Execution types (shared with streamlib for code generation)
-streamlib-processor-schema = { path = "../streamlib-processor-schema", version = "0.20.0" }
+streamlib-processor-schema = { path = "../streamlib-processor-schema", version = "0.21.0" }
 
 [dev-dependencies]
 crossbeam-channel = "0.5"
diff --git a/sdk/streamlib-python-wheel/Cargo.toml b/sdk/streamlib-python-wheel/Cargo.toml
index 21745a584..1f803e158 100644
--- a/sdk/streamlib-python-wheel/Cargo.toml
+++ b/sdk/streamlib-python-wheel/Cargo.toml
@@ -38,7 +38,7 @@ extension-module = ["pyo3/extension-module"]
 # exist for them.
 pyo3 = { version = "0.29.0", features = ["abi3-py310"] }
 
-streamlib = { path = "../streamlib-sdk", version = "0.20.0" }
+streamlib = { path = "../streamlib-sdk", version = "0.21.0" }
 
 # The one control plane, hosted in-process by a runtime that enables it
 # (`rt.host_control_plane(...)`) — what makes a Python-launched app show up in
@@ -49,14 +49,14 @@ streamlib-api-server = { path = "../../runtime/streamlib-api-server" }
 # The native media built-ins the wheel exports as pre-built named blocks
 # (`rt.add(TestPatternSource)`), statically linked so they are current by
 # construction.
-streamlib-media-builtins = { path = "../../runtime/streamlib-media-builtins", version = "0.20.0" }
+streamlib-media-builtins = { path = "../../runtime/streamlib-media-builtins", version = "0.21.0" }
 
 # The workspace's single DLPack home: the `#[repr(C)]` v0.8 ABI mirrors, the
 # managed-tensor builders, and the layout regression test that pins them. The
 # pixel-exchange surface builds its capsules here rather than growing a second
 # copy of the spec — the CUDA half of the same adapter is what the device-memory
 # export path uses.
-streamlib-adapter-cuda = { path = "../../adapters/streamlib-adapter-cuda", version = "0.20.0" }
+streamlib-adapter-cuda = { path = "../../adapters/streamlib-adapter-cuda", version = "0.21.0" }
 
 # The bag's value tree. A bag crosses into Python as ordinary Python data, and
 # `rmpv`'s native `bin` variant is what keeps a byte payload from decoding as
@@ -90,8 +90,8 @@ cudarc = { workspace = true }
 # consumer-side Vulkan import that turns its DMA-BUF plane fds into mapped
 # memory. Both already ride in the binary via the engine; named here so the
 # wheel can call them.
-streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.20.0" }
-streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.20.0" }
+streamlib-surface-client = { path = "../../runtime/streamlib-surface-client", version = "0.21.0" }
+streamlib-consumer-rhi = { path = "../../runtime/streamlib-consumer-rhi", version = "0.21.0" }
 
 [lints]
 workspace = true
diff --git a/sdk/streamlib-python-wheel/pyproject.toml b/sdk/streamlib-python-wheel/pyproject.toml
index 6f933aebc..8b1cde64a 100644
--- a/sdk/streamlib-python-wheel/pyproject.toml
+++ b/sdk/streamlib-python-wheel/pyproject.toml
@@ -10,7 +10,7 @@ name = "streamlib"
 # Tracks [workspace.package].version in the root Cargo.toml — the plan's "two
 # artifacts, one version, released together". release-please bumps this file
 # through its `extra-files` list, so the wheel and the crate never drift.
-version = "0.20.0"
+version = "0.21.0"
 description = "StreamLib — a realtime streaming engine with Python authoring"
 # abi3-py310 in Cargo.toml is the binding half of this floor; the two move
 # together or the wheel claims interpreters its ABI tag does not cover.
diff --git a/sdk/streamlib-sdk/Cargo.toml b/sdk/streamlib-sdk/Cargo.toml
index 09b0ac749..dc56af63e 100644
--- a/sdk/streamlib-sdk/Cargo.toml
+++ b/sdk/streamlib-sdk/Cargo.toml
@@ -27,7 +27,7 @@ hardware-tests = ["streamlib-engine/hardware-tests"]
 test-support = ["streamlib-engine/test-support"]
 
 [dependencies]
-streamlib-engine = { path = "../../runtime/streamlib-engine", version = "0.20.0" }
+streamlib-engine = { path = "../../runtime/streamlib-engine", version = "0.21.0" }
 # `App` sugar takes `impl Serialize` configs and encodes them to the JSON the
 # runtime carries.
 serde = { workspace = true }
diff --git a/sdk/vulkan-jpeg/Cargo.toml b/sdk/vulkan-jpeg/Cargo.toml
index 5f00332e8..b0b706699 100644
--- a/sdk/vulkan-jpeg/Cargo.toml
+++ b/sdk/vulkan-jpeg/Cargo.toml
@@ -17,7 +17,7 @@ bytemuck = { version = "1.16", features = ["derive"] }
 # backend builds against (VulkanComputeKernel, StorageBuffer, TextureRing,
 # ComputeKernelDescriptor, the color-math types, and the GpuContextFullAccess
 # view) under `streamlib::sdk::*` and its `sdk::engine::host_rhi` tier.
-streamlib = { path = "../streamlib-sdk", version = "0.20.0" }
+streamlib = { path = "../streamlib-sdk", version = "0.21.0" }
 
 [dev-dependencies]
 jpeg-encoder = "0.6"