diff --git a/Cargo.lock b/Cargo.lock
index fee4fd2..786a055 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -240,7 +240,7 @@ dependencies = [
  "jni",
  "jni-toolbox",
  "lazy_static",
- "mlua-codemp-patch",
+ "mlua",
  "napi",
  "napi-build",
  "napi-derive",
@@ -911,12 +911,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "mlua-codemp-patch"
-version = "0.10.0-beta.2"
+name = "mlua"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a52f529509c236114a5cf5bb3c0c06ff0695ad45d718256930ec2416edf3817"
+checksum = "0ae9546e4a268c309804e8bbb7526e31cbfdedca7cd60ac1b987d0b212e0d876"
 dependencies = [
  "bstr",
+ "either",
  "erased-serde",
  "mlua-sys",
  "mlua_derive",
@@ -929,9 +930,9 @@ dependencies = [
 
 [[package]]
 name = "mlua-sys"
-version = "0.6.4"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e9eebac25c35a13285456c88ee2fde93d9aee8bcfdaf03f9d6d12be3391351ec"
+checksum = "efa6bf1a64f06848749b7e7727417f4ec2121599e2a10ef0a8a3888b0e9a5a0d"
 dependencies = [
  "cc",
  "cfg-if",
@@ -940,9 +941,9 @@ dependencies = [
 
 [[package]]
 name = "mlua_derive"
-version = "0.10.0-beta.1"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13e6f40fa1fd8426285688f4a37b56beac69284743d057ee6db352b543f4b621"
+checksum = "2cfc5faa2e0d044b3f5f0879be2920e0a711c97744c42cf1c295cb183668933e"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 4394369..df57212 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ jni = { version = "0.21", features = ["invocation"], optional = true }
 jni-toolbox = { version = "0.2", optional = true, features = ["uuid"] }
 
 # glue (lua)
-mlua-codemp-patch = { version = "0.10.0-beta.2", features = ["module", "send", "serialize"], optional = true }
+mlua = { version = "0.10", features = ["module", "serialize", "error-send"], optional = true }
 
 # glue (js)
 napi = { version = "2.16", features = ["full"], optional = true } 
@@ -74,10 +74,10 @@ test-e2e = []
 java = ["dep:lazy_static", "dep:jni", "dep:tracing-subscriber", "dep:jni-toolbox"]
 js = ["dep:napi-build", "dep:tracing-subscriber", "dep:napi", "dep:napi-derive"]
 py = ["dep:pyo3", "dep:tracing-subscriber", "dep:pyo3-build-config"]
-lua = ["serialize", "dep:mlua-codemp-patch", "dep:tracing-subscriber", "dep:lazy_static"]
+lua = ["serialize", "dep:mlua", "dep:tracing-subscriber", "dep:lazy_static"]
 # ffi variants
-lua-jit = ["mlua-codemp-patch?/luajit"]
-lua-54 = ["mlua-codemp-patch?/lua54"]
+lua-jit = ["mlua?/luajit"]
+lua-54 = ["mlua?/lua54"]
 py-abi3 = ["pyo3?/abi3-py38"]
 
 
diff --git a/src/buffer/controller.rs b/src/buffer/controller.rs
index 62b6f6d..9f1a9d1 100644
--- a/src/buffer/controller.rs
+++ b/src/buffer/controller.rs
@@ -22,9 +22,14 @@ use crate::ext::IgnorableError;
 pub struct BufferController(pub(crate) Arc<BufferControllerInner>);
 
 impl BufferController {
+	/// Get id of workspace containing this controller
+	pub fn workspace_id(&self) -> &str {
+		&self.0.workspace_id
+	}
+
 	/// Get the buffer path.
 	pub fn path(&self) -> &str {
-		&self.0.name
+		&self.0.path
 	}
 
 	/// Return buffer whole content, updating internal acknowledgement tracker.
@@ -50,7 +55,7 @@ impl BufferController {
 
 #[derive(Debug)]
 pub(crate) struct BufferControllerInner {
-	pub(crate) name: String,
+	pub(crate) path: String,
 	pub(crate) latest_version: watch::Receiver<diamond_types::LocalVersion>,
 	pub(crate) local_version: watch::Receiver<diamond_types::LocalVersion>,
 	pub(crate) ops_in: mpsc::UnboundedSender<TextChange>,
@@ -59,6 +64,7 @@ pub(crate) struct BufferControllerInner {
 	pub(crate) delta_request: mpsc::Sender<oneshot::Sender<Option<BufferUpdate>>>,
 	pub(crate) callback: watch::Sender<Option<ControllerCallback<BufferController>>>,
 	pub(crate) ack_tx: mpsc::UnboundedSender<LocalVersion>,
+	pub(crate) workspace_id: String,
 }
 
 #[cfg_attr(feature = "async-trait", async_trait::async_trait)]
diff --git a/src/buffer/worker.rs b/src/buffer/worker.rs
index 48de01b..8a9b405 100644
--- a/src/buffer/worker.rs
+++ b/src/buffer/worker.rs
@@ -40,6 +40,7 @@ impl BufferController {
 		path: &str,
 		tx: mpsc::Sender<Operation>,
 		rx: Streaming<BufferEvent>,
+		workspace_id: &str,
 	) -> Self {
 		let init = diamond_types::LocalVersion::default();
 
@@ -57,7 +58,7 @@ impl BufferController {
 		let agent_id = oplog.get_or_create_agent_id(&user_id.to_string());
 
 		let controller = Arc::new(BufferControllerInner {
-			name: path.to_string(),
+			path: path.to_string(),
 			latest_version: latest_version_rx,
 			local_version: my_version_rx,
 			ops_in: opin_tx,
@@ -66,6 +67,7 @@ impl BufferController {
 			delta_request: recv_tx,
 			callback: cb_tx,
 			ack_tx,
+			workspace_id: workspace_id.to_string(),
 		});
 
 		let weak = Arc::downgrade(&controller);
diff --git a/src/cursor/controller.rs b/src/cursor/controller.rs
index ec26069..d0c544c 100644
--- a/src/cursor/controller.rs
+++ b/src/cursor/controller.rs
@@ -25,12 +25,19 @@ use codemp_proto::{
 #[cfg_attr(feature = "js", napi_derive::napi)]
 pub struct CursorController(pub(crate) Arc<CursorControllerInner>);
 
+impl CursorController {
+	pub fn workspace_id(&self) -> &str {
+		&self.0.workspace_id
+	}
+}
+
 #[derive(Debug)]
 pub(crate) struct CursorControllerInner {
 	pub(crate) op: mpsc::UnboundedSender<CursorPosition>,
 	pub(crate) stream: mpsc::Sender<oneshot::Sender<Option<Cursor>>>,
 	pub(crate) poll: mpsc::UnboundedSender<oneshot::Sender<()>>,
 	pub(crate) callback: watch::Sender<Option<ControllerCallback<CursorController>>>,
+	pub(crate) workspace_id: String,
 }
 
 #[cfg_attr(feature = "async-trait", async_trait::async_trait)]
diff --git a/src/cursor/worker.rs b/src/cursor/worker.rs
index a690a9a..16d5d26 100644
--- a/src/cursor/worker.rs
+++ b/src/cursor/worker.rs
@@ -28,6 +28,7 @@ impl CursorController {
 		user_map: Arc<dashmap::DashMap<Uuid, User>>,
 		tx: mpsc::Sender<CursorPosition>,
 		rx: Streaming<CursorEvent>,
+		workspace_id: &str,
 	) -> Self {
 		// TODO we should tweak the channel buffer size to better propagate backpressure
 		let (op_tx, op_rx) = mpsc::unbounded_channel();
@@ -39,6 +40,7 @@ impl CursorController {
 			stream: stream_tx,
 			callback: cb_tx,
 			poll: poll_tx,
+			workspace_id: workspace_id.to_string(),
 		});
 
 		let weak = Arc::downgrade(&controller);
diff --git a/src/ffi/lua/buffer.rs b/src/ffi/lua/buffer.rs
index 2392734..d061b9c 100644
--- a/src/ffi/lua/buffer.rs
+++ b/src/ffi/lua/buffer.rs
@@ -1,6 +1,5 @@
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 use super::ext::a_sync::a_sync;
 
@@ -31,11 +30,23 @@ impl LuaUserData for CodempBufferController {
 			|_, this, ()| a_sync! { this => this.content().await? },
 		);
 
-		methods.add_method("clear_callback", |_, this, ()| Ok(this.clear_callback()));
-		methods.add_method("callback", |_, this, (cb,): (LuaFunction,)| {
+		methods.add_method("clear_callback", move |lua, this, ()| {
+			this.clear_callback();
+			lua.unset_named_registry_value(&this.lua_callback_id())
+		});
+
+		methods.add_method("callback", move |lua, this, (cb,): (LuaFunction,)| {
+			let key = this.lua_callback_id();
+			lua.set_named_registry_value(&key, cb)?;
 			Ok(this.callback(move |controller: CodempBufferController| {
-				super::ext::callback().invoke(cb.clone(), controller)
+				super::ext::callback().invoke(key.clone(), controller, false)
 			}))
 		});
 	}
 }
+
+impl CodempBufferController {
+	fn lua_callback_id(&self) -> String {
+		format!("codemp-buffercontroller({}:{})-callback-registry", self.workspace_id(), self.path())
+	}
+}
diff --git a/src/ffi/lua/client.rs b/src/ffi/lua/client.rs
index 4a8f4d2..4c69c40 100644
--- a/src/ffi/lua/client.rs
+++ b/src/ffi/lua/client.rs
@@ -1,6 +1,5 @@
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 use super::ext::a_sync::a_sync;
 
diff --git a/src/ffi/lua/cursor.rs b/src/ffi/lua/cursor.rs
index 5a7c220..d590034 100644
--- a/src/ffi/lua/cursor.rs
+++ b/src/ffi/lua/cursor.rs
@@ -1,6 +1,5 @@
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 use super::ext::a_sync::a_sync;
 
@@ -22,11 +21,22 @@ impl LuaUserData for CodempCursorController {
 		methods.add_method("recv", |_, this, ()| a_sync! { this => this.recv().await? });
 		methods.add_method("poll", |_, this, ()| a_sync! { this => this.poll().await? });
 
-		methods.add_method("clear_callback", |_, this, ()| Ok(this.clear_callback()));
-		methods.add_method("callback", |_, this, (cb,): (LuaFunction,)| {
+		methods.add_method("clear_callback", |lua, this, ()| {
+			this.clear_callback();
+			lua.unset_named_registry_value(&this.lua_callback_id())
+		});
+		methods.add_method("callback", |lua, this, (cb,): (LuaFunction,)| {
+			let key = this.lua_callback_id();
+			lua.set_named_registry_value(&key, cb)?;
 			Ok(this.callback(move |controller: CodempCursorController| {
-				super::ext::callback().invoke(cb.clone(), controller)
+				super::ext::callback().invoke(key.clone(), controller, false)
 			}))
 		});
 	}
 }
+
+impl CodempCursorController {
+	fn lua_callback_id(&self) -> String {
+		format!("codemp-cursorcontroller({})-callback-registry", self.workspace_id())
+	}
+}
diff --git a/src/ffi/lua/ext/a_sync.rs b/src/ffi/lua/ext/a_sync.rs
index 2e10776..13600dc 100644
--- a/src/ffi/lua/ext/a_sync.rs
+++ b/src/ffi/lua/ext/a_sync.rs
@@ -1,5 +1,4 @@
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 pub(crate) fn tokio() -> &'static tokio::runtime::Runtime {
 	use std::sync::OnceLock;
@@ -21,7 +20,8 @@ macro_rules! a_sync {
 					Some(
 						crate::ffi::lua::ext::a_sync::tokio()
 							.spawn(async move {
-								Ok(crate::ffi::lua::ext::callback::CallbackArg::from($x))
+								let res = $x;
+								Ok(crate::ffi::lua::ext::callback::CallbackArg::from(res))
 							})
 					)
 				)
@@ -47,13 +47,20 @@ impl LuaUserData for Promise {
 		// TODO: await MUST NOT be used in callbacks!!
 		methods.add_method_mut("await", |_, this, ()| match this.0.take() {
 			None => Err(LuaError::runtime("Promise already awaited")),
-			Some(x) => tokio().block_on(x).map_err(LuaError::runtime)?,
+			Some(x) => Ok(
+				tokio()
+					.block_on(x)
+					.map_err(LuaError::runtime)?
+					.map_err(LuaError::runtime)?
+			),
 		});
 		methods.add_method_mut("cancel", |_, this, ()| match this.0.take() {
 			None => Err(LuaError::runtime("Promise already awaited")),
 			Some(x) => Ok(x.abort()),
 		});
-		methods.add_method_mut("and_then", |_, this, (cb,): (LuaFunction,)| {
+		methods.add_method_mut("and_then", |lua, this, (cb,): (LuaFunction,)| {
+			let key = uuid::Uuid::new_v4().to_string();
+			lua.set_named_registry_value(&key, cb)?;
 			match this.0.take() {
 				None => Err(LuaError::runtime("Promise already awaited")),
 				Some(x) => {
@@ -64,9 +71,9 @@ impl LuaUserData for Promise {
 							}
 							Ok(res) => match res {
 								Err(e) => super::callback().failure(e),
-								Ok(val) => super::callback().invoke(cb, val),
+								Ok(val) => super::callback().invoke(key, val, true),
 							},
-						}
+						};
 					});
 					Ok(())
 				}
diff --git a/src/ffi/lua/ext/callback.rs b/src/ffi/lua/ext/callback.rs
index 54d8e03..269fa8f 100644
--- a/src/ffi/lua/ext/callback.rs
+++ b/src/ffi/lua/ext/callback.rs
@@ -1,7 +1,6 @@
 use crate::ext::IgnorableError;
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 pub(crate) fn callback() -> &'static CallbackChannel<LuaCallback> {
 	static CHANNEL: std::sync::OnceLock<CallbackChannel<LuaCallback>> = std::sync::OnceLock::new();
@@ -25,21 +24,19 @@ impl Default for CallbackChannel<LuaCallback> {
 }
 
 impl CallbackChannel<LuaCallback> {
-	pub(crate) fn invoke(&self, cb: LuaFunction, arg: impl Into<CallbackArg>) {
+	pub(crate) fn invoke(&self, key: String, arg: impl Into<CallbackArg>, cleanup: bool) {
 		self.tx
-			.send(LuaCallback::Invoke(cb, arg.into()))
+			.send(LuaCallback::Invoke(key, arg.into(), cleanup))
 			.unwrap_or_warn("error scheduling callback")
 	}
 
 	pub(crate) fn failure(&self, err: impl std::error::Error) {
 		self.tx
-			.send(LuaCallback::Fail(format!(
-				"promise failed with error: {err:?}"
-			)))
+			.send(LuaCallback::Fail(format!("callback returned error: {err:?}")))
 			.unwrap_or_warn("error scheduling callback failure")
 	}
 
-	pub(crate) fn recv(&self) -> Option<LuaCallback> {
+	pub(crate) fn recv(&self, lua: &Lua) -> Option<(LuaFunction, CallbackArg)> {
 		match self.rx.try_lock() {
 			Err(e) => {
 				tracing::debug!("backing off from callback mutex: {e}");
@@ -51,7 +48,25 @@ impl CallbackChannel<LuaCallback> {
 					None
 				}
 				Err(tokio::sync::mpsc::error::TryRecvError::Empty) => None,
-				Ok(cb) => Some(cb),
+				Ok(LuaCallback::Fail(msg)) => {
+					tracing::error!("callback returned error: {msg}");
+					None
+				},
+				Ok(LuaCallback::Invoke(key, arg, cleanup)) => {
+					let cb = match lua.named_registry_value::<LuaFunction>(&key) {
+						Ok(x) => x,
+						Err(e) => {
+							tracing::error!("could not get callback to invoke: {e}");
+							return None;
+						},
+					};
+					if cleanup {
+						if let Err(e) = lua.unset_named_registry_value(&key) {
+							tracing::warn!("could not unset callback from registry: {e}");
+						}
+					}
+					Some((cb, arg))
+				},
 			},
 		}
 	}
@@ -59,7 +74,7 @@ impl CallbackChannel<LuaCallback> {
 
 pub(crate) enum LuaCallback {
 	Fail(String),
-	Invoke(LuaFunction, CallbackArg),
+	Invoke(String, CallbackArg, bool),
 }
 
 macro_rules! callback_args {
diff --git a/src/ffi/lua/ext/log.rs b/src/ffi/lua/ext/log.rs
index e22bc64..b9728e9 100644
--- a/src/ffi/lua/ext/log.rs
+++ b/src/ffi/lua/ext/log.rs
@@ -1,7 +1,6 @@
 use std::{io::Write, sync::Mutex};
 
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 use tokio::sync::mpsc;
 
 #[derive(Debug, Clone)]
@@ -19,7 +18,7 @@ impl Write for LuaLoggerProducer {
 
 // TODO can we make this less verbose?
 pub(crate) fn setup_tracing(
-	_: &Lua,
+	lua: &Lua,
 	(printer, debug): (LuaValue, Option<bool>),
 ) -> LuaResult<bool> {
 	let level = if debug.unwrap_or_default() {
@@ -37,14 +36,6 @@ pub(crate) fn setup_tracing(
 		.with_source_location(false);
 
 	let success = match printer {
-		LuaValue::Boolean(_)
-		| LuaValue::LightUserData(_)
-		| LuaValue::Integer(_)
-		| LuaValue::Number(_)
-		| LuaValue::Table(_)
-		| LuaValue::Thread(_)
-		| LuaValue::UserData(_)
-		| LuaValue::Error(_) => return Err(LuaError::BindError), // TODO full BadArgument type??
 		LuaValue::Nil => tracing_subscriber::fmt()
 			.event_format(format)
 			.with_max_level(level)
@@ -63,6 +54,8 @@ pub(crate) fn setup_tracing(
 				.is_ok()
 		}
 		LuaValue::Function(cb) => {
+			let key = uuid::Uuid::new_v4().to_string();
+			lua.set_named_registry_value(&key, cb)?;
 			let (tx, mut rx) = mpsc::unbounded_channel();
 			let res = tracing_subscriber::fmt()
 				.event_format(format)
@@ -74,12 +67,13 @@ pub(crate) fn setup_tracing(
 			if res {
 				super::a_sync::tokio().spawn(async move {
 					while let Some(msg) = rx.recv().await {
-						super::callback().invoke(cb.clone(), msg);
+						super::callback().invoke(key.clone(), msg, false);
 					}
 				});
 			}
 			res
-		}
+		},
+		_ => return Err(LuaError::BindError), // TODO full BadArgument type??
 	};
 
 	Ok(success)
diff --git a/src/ffi/lua/mod.rs b/src/ffi/lua/mod.rs
index 33792d0..7c4a5e2 100644
--- a/src/ffi/lua/mod.rs
+++ b/src/ffi/lua/mod.rs
@@ -6,7 +6,6 @@ mod workspace;
 
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 // define multiple entrypoints, so this library can have multiple names and still work
 #[mlua::lua_module(name = "codemp")]
@@ -57,16 +56,12 @@ fn entrypoint(lua: &Lua) -> LuaResult<LuaTable> {
 		"poll_callback",
 		lua.create_function(|lua, ()| {
 			let mut val = LuaMultiValue::new();
-			match ext::callback().recv() {
+			match ext::callback().recv(lua) {
 				None => {}
-				Some(ext::callback::LuaCallback::Invoke(cb, arg)) => {
+				Some((cb, arg)) => {
 					val.push_back(LuaValue::Function(cb));
 					val.push_back(arg.into_lua(lua)?);
 				}
-				Some(ext::callback::LuaCallback::Fail(msg)) => {
-					val.push_back(false.into_lua(lua)?);
-					val.push_back(msg.into_lua(lua)?);
-				}
 			}
 			Ok(val)
 		})?,
diff --git a/src/ffi/lua/workspace.rs b/src/ffi/lua/workspace.rs
index 2094f75..3ce118e 100644
--- a/src/ffi/lua/workspace.rs
+++ b/src/ffi/lua/workspace.rs
@@ -1,6 +1,5 @@
 use crate::prelude::*;
 use mlua::prelude::*;
-use mlua_codemp_patch as mlua;
 
 use super::ext::a_sync::a_sync;
 
@@ -67,12 +66,23 @@ impl LuaUserData for CodempWorkspace {
 
 		methods.add_method("poll", |_, this, ()| a_sync! { this => this.poll().await? });
 
-		methods.add_method("callback", |_, this, (cb,): (LuaFunction,)| {
+		methods.add_method("callback", |lua, this, (cb,): (LuaFunction,)| {
+			let key = this.lua_callback_id();
+			lua.set_named_registry_value(&key, cb)?;
 			Ok(this.callback(move |controller: CodempWorkspace| {
-				super::ext::callback().invoke(cb.clone(), controller)
+				super::ext::callback().invoke(key.clone(), controller, false)
 			}))
 		});
 
-		methods.add_method("clear_callback", |_, this, ()| Ok(this.clear_callback()));
+		methods.add_method("clear_callback", |lua, this, ()| {
+			this.clear_callback();
+			lua.unset_named_registry_value(&this.lua_callback_id())
+		});
+	}
+}
+
+impl CodempWorkspace {
+	fn lua_callback_id(&self) -> String {
+		format!("codemp-workspace({})-callback-registry", self.id())
 	}
 }
diff --git a/src/workspace.rs b/src/workspace.rs
index 4d0a788..bd46f5c 100644
--- a/src/workspace.rs
+++ b/src/workspace.rs
@@ -113,7 +113,7 @@ impl Workspace {
 
 		let users = Arc::new(DashMap::default());
 
-		let controller = cursor::Controller::spawn(users.clone(), tx, cur_stream);
+		let controller = cursor::Controller::spawn(users.clone(), tx, cur_stream, &name);
 
 		let ws = Self(Arc::new(WorkspaceInner {
 			name,
@@ -175,7 +175,7 @@ impl Workspace {
 		);
 		let stream = self.0.services.buf().attach(req).await?.into_inner();
 
-		let controller = buffer::Controller::spawn(self.0.user.id, path, tx, stream);
+		let controller = buffer::Controller::spawn(self.0.user.id, path, tx, stream, &self.0.name);
 		self.0.buffers.insert(path.to_string(), controller.clone());
 
 		Ok(controller)