diff --git a/dap-sdk b/dap-sdk
index 136957afc5eaa4d7ae3b830f1d169908e2a9e696..7e3bc51a4004f0a3163578430c784caf40f61d00 160000
--- a/dap-sdk
+++ b/dap-sdk
@@ -1 +1 @@
-Subproject commit 136957afc5eaa4d7ae3b830f1d169908e2a9e696
+Subproject commit 7e3bc51a4004f0a3163578430c784caf40f61d00
diff --git a/modules/chain/dap_chain_ch.c b/modules/chain/dap_chain_ch.c
index e7b4fb6ca157dde147b54cac34c5c6a88800db06..2408af9abd05bc29689d681c52ce0cc5aef608da 100644
--- a/modules/chain/dap_chain_ch.c
+++ b/modules/chain/dap_chain_ch.c
@@ -140,7 +140,7 @@ static bool s_sync_timer_callback(void *a_arg);
 static bool s_debug_more = false, s_debug_legacy = false;
 static uint32_t s_sync_timeout = 30;
 static uint32_t s_sync_packets_per_thread_call = 10;
-static uint32_t s_sync_ack_window_size = 100; // atoms
+static uint32_t s_sync_ack_window_size = 512; // atoms
 
 // Legacy
 static uint_fast16_t s_update_pack_size = 100; // Number of hashes packed into the one packet