diff --git a/src/version.h b/src/version.h
index ce0893530e..0fbcd1ffae 100644
--- a/src/version.h
+++ b/src/version.h
@@ -11,7 +11,7 @@
  */
 
 
-static const int PROTOCOL_VERSION = 70230;
+static const int PROTOCOL_VERSION = 70231;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;
@@ -52,6 +52,9 @@ static const int MNLISTDIFF_VERSION_ORDER = 70229;
 //! Masternode type was introduced in this version
 static const int MNLISTDIFF_CHAINLOCKS_PROTO_VERSION = 70230;
 
+//! Legacy ISLOCK messages and a corresponding INV were dropped in this version
+static const int NO_LEGACY_ISLOCK_PROTO_VERSION = 70231;
+
 // Make sure that none of the values above collide with `ADDRV2_FORMAT`.
 
 #endif // BITCOIN_VERSION_H
diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 1552bd603b..5d07a8b31b 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -32,7 +32,7 @@ from test_framework.util import hex_str_to_bytes, assert_equal
 import dash_hash
 
 MIN_VERSION_SUPPORTED = 60001
-MY_VERSION = 70230  # MNLISTDIFF_CHAINLOCKS_PROTO_VERSION
+MY_VERSION = 70231  # NO_LEGACY_ISLOCK_PROTO_VERSION
 MY_SUBVERSION = b"/python-p2p-tester:0.0.3%s/"
 MY_RELAY = 1 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)