diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa7f3ea..e267caa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+# v0.4.1
+- Impose `Send + Sync` bounds on `Error::Other`
 # v0.4.0
 - Delete `EnumExt`
 - Bump dependencies, and rust version to 2021
diff --git a/bin-proto/Cargo.toml b/bin-proto/Cargo.toml
index fe1da5d..4c61297 100644
--- a/bin-proto/Cargo.toml
+++ b/bin-proto/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bin-proto"
-version = "0.4.0"
+version = "0.4.1"
 authors = [
     "Wojciech Graj <wojtek.graj.2004@gmail.com>",
     "Dylan McKay <me@dylanmckay.io>"
diff --git a/bin-proto/src/error.rs b/bin-proto/src/error.rs
index c82d7f1..1a2eec5 100644
--- a/bin-proto/src/error.rs
+++ b/bin-proto/src/error.rs
@@ -13,5 +13,5 @@ pub enum Error {
     #[error("received unknown enum discriminant '{0}'")]
     UnknownEnumDiscriminant(String),
     #[error("{0}")]
-    Other(Box<dyn std::error::Error>),
+    Other(Box<dyn std::error::Error + Send + Sync>),
 }