diff --git a/Cargo.toml b/Cargo.toml
index 85f5f85..37a0ed5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bn"
-version = "0.2.2"
+version = "0.2.3"
 authors = ["Sean Bowe <ewillbefull@gmail.com>"]
 description = "Pairing cryptography with the Barreto-Naehrig curve"
 keywords = ["pairing","crypto","cryptography"]
diff --git a/README.md b/README.md
index 90cd2d1..e4c9c4a 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Add the `bn` crate to your dependencies in `Cargo.toml`...
 
 ```toml
 [dependencies]
-bn = "0.2.2"
+bn = "0.2.3"
 ```
 
 ...and add an `extern crate` declaration to your crate root:
diff --git a/src/lib.rs b/src/lib.rs
index 02b50f6..bca77d9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -55,6 +55,7 @@ pub trait Group:
         rustc_serialize::Decodable +
         'static +
         Send +
+        Sync +
         Copy +
         Clone +
         PartialEq +