diff --git a/CHANGELOG.md b/CHANGELOG.md
index 461048c..d39ac66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 
+# 0.2.0
+
+* Finished core interfaces and testing
+
 # 0.1.0
 
 * Playing with Rust
diff --git a/src/coordinator.rs b/src/coordinator.rs
index b831868..ae4a0eb 100644
--- a/src/coordinator.rs
+++ b/src/coordinator.rs
@@ -57,7 +57,7 @@ pub fn run_request<T: Service, K: ClientChain, D: Storage>(
             storage.save_challenge_state(&challenge)?;
 
             // create a challenge state mutex to share between challenger and listener
-            let mut shared_challenge = Arc::new(Mutex::new(challenge));
+            let shared_challenge = Arc::new(Mutex::new(challenge));
             // and a channel for sending responses from listener to challenger
             let (verify_tx, verify_rx): (Sender<ChallengeResponse>, Receiver<ChallengeResponse>) = channel();