diff --git a/Cargo.lock b/Cargo.lock
index b9b09b3..4f076d8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1813,8 +1813,8 @@ dependencies = [
 
 [[package]]
 name = "de-mls"
-version = "3.0.0"
-source = "git+https://github.com/vacp2p/de-mls?branch=develop#c8cd6c903726684dc4660a773bfa712c2c8be5a3"
+version = "4.0.0"
+source = "git+https://github.com/vacp2p/de-mls?tag=v4.0.0#425203056d4586115beef6559b49560095a15256"
 dependencies = [
  "hashgraph-like-consensus",
  "indexmap 2.14.0",
diff --git a/core/conversations/Cargo.toml b/core/conversations/Cargo.toml
index 52caa29..4c4b8db 100644
--- a/core/conversations/Cargo.toml
+++ b/core/conversations/Cargo.toml
@@ -18,7 +18,7 @@ storage = { workspace = true }
 alloy = "2.0"
 base64 = "0.22"
 chat-proto = { git = "https://github.com/logos-messaging/chat_proto", rev = "37ec98a151f6d50aab2905802ac0a896477e62ea" }
-de-mls = { git = "https://github.com/vacp2p/de-mls", branch = "develop" }
+de-mls = { git = "https://github.com/vacp2p/de-mls", tag = "v4.0.0" }
 double-ratchets = { path = "../double-ratchets" }
 hashgraph-like-consensus = "0.5.1"
 hex = "0.4.3"