diff --git a/bin/wasm-node/CHANGELOG.md b/bin/wasm-node/CHANGELOG.md
index fe625826ab..7d2d3e8276 100644
--- a/bin/wasm-node/CHANGELOG.md
+++ b/bin/wasm-node/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Fixed
+
+- Increase the threshold after which smoldot considers that a protocol name sent through multistream-select is an attempt at a DoS attack, to accomodate for the change in the GrandPa protocol name in Substrate. ([#2162](https://github.com/paritytech/smoldot/pull/2162))
+
 ## 0.6.6 - 2022-03-18
 
 ### Added
diff --git a/src/libp2p/connection/multistream_select.rs b/src/libp2p/connection/multistream_select.rs
index 3bba32000d..bbc39ee1a5 100644
--- a/src/libp2p/connection/multistream_select.rs
+++ b/src/libp2p/connection/multistream_select.rs
@@ -169,7 +169,7 @@ where
         // legitimately requests a protocol that the listener doesn't support. In order to prevent
         // confusion, a minimum length is applied to the protocol name length. Any protocol name
         // smaller than this will never trigger a protocol error, even if it isn't supported.
-        const MIN_PROTO_LEN_NO_ERR: usize = 48;
+        const MIN_PROTO_LEN_NO_ERR: usize = 512;
         let max_frame_len = cmp::max(
             cmp::max(max_proto_name_len, MIN_PROTO_LEN_NO_ERR),
             HANDSHAKE.len(),