diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cf01bed..d629ae7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## Version 0.56.1
+
+- Fix unstable sync (key blocks mismatch)
+
 ## Version 0.56.0
 
 - Get rid of ton::bytes type
diff --git a/Cargo.toml b/Cargo.toml
index a8d03d84..d0127e4e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 build = 'common/build/build.rs'
 edition = '2021'
 name = 'ton_node'
-version = '0.56.0'
+version = '0.56.1'
 
 [workspace]
 members = [ 'storage' ]
diff --git a/src/boot.rs b/src/boot.rs
index 3c8c9918..bd15377b 100644
--- a/src/boot.rs
+++ b/src/boot.rs
@@ -151,9 +151,11 @@ async fn get_key_blocks(
     zero_state: Option<&Arc<ShardStateStuff>>,
     mut prev_block_proof: Option<BlockProofStuff>
 ) -> Result<Vec<Arc<BlockHandle>>> {
+    const MAX_RETRIES: usize = 100;
     let mut hardfork_iter = engine.hardforks().iter();
     let mut hardfork = hardfork_iter.next();
     let mut key_blocks = vec!(handle.clone());
+    let mut stuck_count = 0;
     'main_loop: loop {
         if engine.check_stop() {
             fail!("Boot was stopped");
@@ -167,10 +169,24 @@ async fn get_key_blocks(
             }
             Ok(ids) => {
                 if let Some(block_id) = ids.last() {
+                    stuck_count = 0;
                     log::info!(target: "boot", "last key block is {}", block_id);
                     ids
                 } else {
-                    return Ok(key_blocks);
+                    stuck_count += 1;
+                    if let Some(handle) = key_blocks.last() {
+                        let utime = handle.gen_utime()?;
+                        log::info!(
+                            target: "boot", 
+                            "Stuck {} times on last key block time diff: {}", 
+                            stuck_count, engine.now() - utime
+                        );
+                    }
+                    if stuck_count >= MAX_RETRIES {
+                        return Ok(key_blocks)
+                    } else {
+                        continue 'main_loop
+                    }
                 }
             }
         };