diff --git a/tnc/static.py b/tnc/static.py
index 19a9ee56..e2696a7b 100644
--- a/tnc/static.py
+++ b/tnc/static.py
@@ -92,7 +92,7 @@ ENABLE_FFT: bool = True
 CHANNEL_BUSY: bool = False
 
 # ARQ PROTOCOL VERSION
-ARQ_PROTOCOL_VERSION: int = 4
+ARQ_PROTOCOL_VERSION: int = 5
 
 # ARQ statistics
 ARQ_BYTES_PER_MINUTE_BURST: int = 0