diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6aa4879..efd6d75 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ on:
     - cron: '00 02 */4 * *'
 env:
   RUST_BACKTRACE: 1
-  CLC_STABLE_HASH: "b963be478a9b97fd149326dc69581f6733b23c23"
+  CLC_STABLE_HASH: "5703e607c324ef3a5453000aca5ea79d8a0fc95f"
 jobs:
   rust-tests:
     name: Rust tests
diff --git a/couchbase-lite-core-sys/build.rs b/couchbase-lite-core-sys/build.rs
index a47f04b..6d00885 100644
--- a/couchbase-lite-core-sys/build.rs
+++ b/couchbase-lite-core-sys/build.rs
@@ -158,7 +158,7 @@ fn download_source_code_via_git_if_needed() -> Result<PathBuf, Box<dyn std::erro
     use which::which;
 
     const URL: &str = "https://github.com/Dushistov/couchbase-lite-core";
-    const COMMIT_SHA1: &str = "b963be478a9b97fd149326dc69581f6733b23c23";
+    const COMMIT_SHA1: &str = "5703e607c324ef3a5453000aca5ea79d8a0fc95f";
 
     let git_path = which("git")?;
     let cur_dir = env::current_dir()?;
diff --git a/couchbase-lite-core-sys/src/helpers.rs b/couchbase-lite-core-sys/src/helpers.rs
index 4daaecc..c4c0b37 100644
--- a/couchbase-lite-core-sys/src/helpers.rs
+++ b/couchbase-lite-core-sys/src/helpers.rs
@@ -79,6 +79,16 @@ impl Default for FLSliceResult {
     }
 }
 
+impl AsRef<[u8]> for FLSliceResult {
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        self.as_bytes()
+    }
+}
+
+/// looks like according C++ code it is safe from other thread
+unsafe impl Send for FLSliceResult {}
+
 impl FLSliceResult {
     #[inline]
     pub fn as_bytes(&self) -> &[u8] {
diff --git a/couchbase-lite/Cargo.toml b/couchbase-lite/Cargo.toml
index ba8404b..c851c6e 100644
--- a/couchbase-lite/Cargo.toml
+++ b/couchbase-lite/Cargo.toml
@@ -9,6 +9,7 @@ documentation = "https://docs.rs/couchbase-lite"
 repository = "https://github.com/dushistov/couchbase-lite-rust"
 readme = "../README.md"
 keywords = ["ffi", "couchbase", "couchbase-lite-core", "database"]
+rust-version = "1.81"
 
 [features]
 default = ["build-cpp", "git-download-cpp", "use-couchbase-lite-sqlite", "use-tokio-websocket", "use-native-tls"]
@@ -26,11 +27,10 @@ couchbase-lite-core-sys = { version = "0.13.0", default-features = false }
 serde-fleece = { version = "0.9.0", default-features = false }
 log = "0.4"
 tokio = { version = "1.16.1", optional = true, default-features = false, features = ["rt", "sync", "macros", "time"] }
-tokio-tungstenite = { version = "0.23.0", optional = true, default-features = false, features = ["connect"] }
+tokio-tungstenite = { version = "0.27.0", optional = true, default-features = false, features = ["connect"] }
 futures-util = { version = "0.3", optional = true, default-features = false }
-# TODO: remove deps when https://github.com/rust-lang/rust/issues/44930
-# was merged
-va_list = "0.1.4"
+# TODO: remove deps when https://github.com/rust-lang/rust/issues/44930 was merged
+va_list = "0.2.1"
 serde = { version = "1.0", default-features = false, features = ["std"] }
 uuid = { version = "1.1.2", default-features = false, features = ["v4", "serde"] }
 bitflags = { version = "2.5.0", default-features = false }
diff --git a/couchbase-lite/src/observer.rs b/couchbase-lite/src/observer.rs
index c5b2e4e..c2c9e23 100644
--- a/couchbase-lite/src/observer.rs
+++ b/couchbase-lite/src/observer.rs
@@ -7,8 +7,7 @@ use crate::{
     },
     Database,
 };
-use log::error;
-use std::{mem::MaybeUninit, os::raw::c_void, panic::catch_unwind, process::abort, ptr::NonNull};
+use std::{mem::MaybeUninit, os::raw::c_void, ptr::NonNull};
 
 pub(crate) struct DatabaseObserver {
     inner: NonNull<C4CollectionObserver>,
@@ -37,18 +36,12 @@ impl DatabaseObserver {
         ) where
             F: FnMut(*const C4CollectionObserver) + Send,
         {
-            let r = catch_unwind(|| {
-                let boxed_f = context as *mut F;
-                assert!(
-                    !boxed_f.is_null(),
-                    "DatabaseObserver: Internal error - null function pointer"
-                );
-                (*boxed_f)(obs);
-            });
-            if r.is_err() {
-                error!("DatabaseObserver::call_boxed_closure catch panic aborting");
-                abort();
-            }
+            let boxed_f = context as *mut F;
+            assert!(
+                !boxed_f.is_null(),
+                "DatabaseObserver: Internal error - null function pointer"
+            );
+            (*boxed_f)(obs);
         }
         let boxed_f: *mut F = Box::into_raw(Box::new(callback_f));
         let mut error = c4error_init();
diff --git a/couchbase-lite/src/replicator.rs b/couchbase-lite/src/replicator.rs
index 3f7aee8..39b3827 100644
--- a/couchbase-lite/src/replicator.rs
+++ b/couchbase-lite/src/replicator.rs
@@ -13,12 +13,10 @@ use crate::{
     },
     Database,
 };
-use log::{error, info, trace};
+use log::{info, trace};
 use std::{
     mem::{self, MaybeUninit},
     os::raw::c_void,
-    panic::catch_unwind,
-    process::abort,
     ptr,
     ptr::NonNull,
     slice, str,
@@ -233,18 +231,12 @@ impl Replicator {
             F2: ReplicatorStatusChangedCallback,
             F3: ReplicatorDocumentsEndedCallback,
         {
-            let r = catch_unwind(|| {
-                let ctx = ctx as *mut CallbackContext<F, F2, F3>;
-                assert!(
-                    !ctx.is_null(),
-                    "Replicator::call_validation: Internal error - null function pointer"
-                );
-                ((*ctx).validation_cb)(coll_spec, doc_id, rev_id, flags, body)
-            });
-            r.unwrap_or_else(|_| {
-                error!("Replicator::call_validation: catch panic aborting");
-                abort();
-            })
+            let ctx = ctx as *mut CallbackContext<F, F2, F3>;
+            assert!(
+                !ctx.is_null(),
+                "Replicator::call_validation: Internal error - null function pointer"
+            );
+            ((*ctx).validation_cb)(coll_spec, doc_id, rev_id, flags, body)
         }
 
         unsafe extern "C" fn call_on_status_changed<F1, F, F3>(
@@ -257,18 +249,13 @@ impl Replicator {
             F3: ReplicatorDocumentsEndedCallback,
         {
             info!("on_status_changed: repl {c4_repl:?}, status {status:?}");
-            let r = catch_unwind(|| {
-                let ctx = ctx as *mut CallbackContext<F1, F, F3>;
-                assert!(
-                    !ctx.is_null(),
-                    "Replicator::call_on_status_changed: Internal error - null function pointer"
-                );
-                ((*ctx).state_cb)(ReplicatorState::from(status));
-            });
-            if r.is_err() {
-                error!("Replicator::call_on_status_changed: catch panic aborting");
-                abort();
-            }
+
+            let ctx = ctx as *mut CallbackContext<F1, F, F3>;
+            assert!(
+                !ctx.is_null(),
+                "Replicator::call_on_status_changed: Internal error - null function pointer"
+            );
+            ((*ctx).state_cb)(ReplicatorState::from(status));
         }
 
         unsafe extern "C" fn call_on_documents_ended<F1, F2, F>(
@@ -283,20 +270,15 @@ impl Replicator {
             F: ReplicatorDocumentsEndedCallback,
         {
             trace!("on_documents_ended: repl {c4_repl:?} pushing {pushing}, num_docs {num_docs}");
-            let r = catch_unwind(|| {
-                let ctx = ctx as *mut CallbackContext<F1, F2, F>;
-                assert!(
-                    !ctx.is_null(),
-                    "Replicator::call_on_documents_ended: Internal error - null function pointer"
-                );
-                let docs: &[*const C4DocumentEnded] = slice::from_raw_parts(docs, num_docs);
-                let mut it = docs.iter().map(|x| &**x);
-                ((*ctx).docs_ended_cb)(pushing, &mut it);
-            });
-            if r.is_err() {
-                error!("Replicator::call_on_documents_ended: catch panic aborting");
-                abort();
-            }
+
+            let ctx = ctx as *mut CallbackContext<F1, F2, F>;
+            assert!(
+                !ctx.is_null(),
+                "Replicator::call_on_documents_ended: Internal error - null function pointer"
+            );
+            let docs: &[*const C4DocumentEnded] = slice::from_raw_parts(docs, num_docs);
+            let mut it = docs.iter().map(|x| &**x);
+            ((*ctx).docs_ended_cb)(pushing, &mut it);
         }
 
         let ctx = Box::new(CallbackContext {
diff --git a/couchbase-lite/src/replicator/tokio_socket.rs b/couchbase-lite/src/replicator/tokio_socket.rs
index c92c08e..e675bd0 100644
--- a/couchbase-lite/src/replicator/tokio_socket.rs
+++ b/couchbase-lite/src/replicator/tokio_socket.rs
@@ -42,7 +42,7 @@ use tokio_tungstenite::{
         handshake::client::{Request, Response},
         http::{self, header::HeaderName, HeaderValue, Uri},
         protocol::{frame::coding::CloseCode, CloseFrame},
-        Message,
+        Bytes, Message,
     },
     WebSocketStream,
 };
@@ -65,8 +65,8 @@ pub fn c4socket_init(handle: Handle) {
 struct SocketImpl {
     handle: Handle,
     read_push_pull: Arc<ReadPushPull>,
-    writer: Arc<TokioMutex<(Option<WsWriter>, mpsc::UnboundedReceiver<Vec<u8>>)>>,
-    send_queue: mpsc::UnboundedSender<Vec<u8>>,
+    writer: Arc<TokioMutex<(Option<WsWriter>, mpsc::UnboundedReceiver<Bytes>)>>,
+    send_queue: mpsc::UnboundedSender<Bytes>,
     close_control: Arc<CloseControl>,
 }
 
@@ -202,9 +202,7 @@ unsafe extern "C" fn ws_write(c4sock: *mut C4Socket, allocated_data: C4SliceResu
     assert!(!native.is_null());
     let socket: &SocketImpl = &*native;
     let writer = socket.writer.clone();
-    //TODO: change this when `Vec` allocator API was stabilized
-    // https://github.com/rust-lang/rust/issues/32838
-    let data: Vec<u8> = allocated_data.as_bytes().to_vec();
+    let data = Bytes::from_owner(allocated_data);
     socket
         .send_queue
         .send(data)
@@ -219,7 +217,7 @@ unsafe extern "C" fn ws_write(c4sock: *mut C4Socket, allocated_data: C4SliceResu
     });
 }
 
-async fn send_binary_msg(ctx: C4SocketPtr, writer: &mut WsWriter, data: Vec<u8>) {
+async fn send_binary_msg(ctx: C4SocketPtr, writer: &mut WsWriter, data: Bytes) {
     let n = data.len();
     if let Err(err) = writer.send(Message::Binary(data)).await {
         error!("c4sock {ctx:?}: writer.send failure: {err}");
@@ -330,7 +328,10 @@ unsafe extern "C" fn ws_request_close(c4sock: *mut C4Socket, status: c_int, mess
             }
             trace!("c4sock {c4sock:?}: sending close message");
             if let Err(err) = writer
-                .send(Message::Close(Some(CloseFrame { code, reason })))
+                .send(Message::Close(Some(CloseFrame {
+                    code,
+                    reason: reason.to_string().into(),
+                })))
                 .await
             {
                 error!("c4sock {c4sock:?}: requestClose, writer.send failure: {err}");
@@ -524,7 +525,7 @@ async fn do_open(
     request: Result<Request, Error>,
     mut stop_rx: oneshot::Receiver<()>,
     read_push_pull: Arc<ReadPushPull>,
-    writer: Arc<TokioMutex<(Option<WsWriter>, mpsc::UnboundedReceiver<Vec<u8>>)>>,
+    writer: Arc<TokioMutex<(Option<WsWriter>, mpsc::UnboundedReceiver<Bytes>)>>,
     close_control: Arc<CloseControl>,
     handle: Handle,
 ) -> Result<(), Error> {
@@ -599,7 +600,7 @@ async fn main_read_loop(
                         let data = m.into_data();
                         read_push_pull.nbytes_avaible.store(data.len(), Ordering::Release);
                         unsafe {
-                            c4socket_received(c4sock.0, data.as_slice().into());
+                            c4socket_received(c4sock.0, data.as_ref().into());
                         }
                         read_push_pull.confirm.notified().await;
                     }
@@ -694,7 +695,7 @@ unsafe fn tungstenite_err_to_c4_err(err: tungstenite::Error) -> Error {
             C4ErrorDomain::NetworkDomain,
             C4NetworkErrorCode::kC4NumNetErrorCodesPlus1.0,
         ),
-        Utf8 => (
+        Utf8(_) => (
             C4ErrorDomain::WebSocketDomain,
             C4WebSocketCloseCode::kWebSocketCloseBadMessageFormat.0,
         ),