diff --git a/tnc/static.py b/tnc/static.py
index 1e271b11..0c3d9329 100644
--- a/tnc/static.py
+++ b/tnc/static.py
@@ -90,7 +90,7 @@ ENABLE_FFT: bool = True
 CHANNEL_BUSY: bool = False
 
 # ARQ PROTOCOL VERSION
-ARQ_PROTOCOL_VERSION: int = 3
+ARQ_PROTOCOL_VERSION: int = 4
 
 # ARQ statistics
 ARQ_BYTES_PER_MINUTE_BURST: int = 0