diff --git a/acp-ktor/src/commonMain/kotlin/com/agentclientprotocol/transport/WebSocketTransport.kt b/acp-ktor/src/commonMain/kotlin/com/agentclientprotocol/transport/WebSocketTransport.kt
index 77cef5a..d2f50fc 100644
--- a/acp-ktor/src/commonMain/kotlin/com/agentclientprotocol/transport/WebSocketTransport.kt
+++ b/acp-ktor/src/commonMain/kotlin/com/agentclientprotocol/transport/WebSocketTransport.kt
@@ -96,6 +96,8 @@ public class WebSocketTransport(private val parentScope: CoroutineScope, private
     }
 
     override fun close() {
-        sendChannel.close()
+        if (sendChannel.close()) {
+            fireClose()
+        }
     }
 }
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index e5ea400..ee7fb68 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 private val buildNumber: String? = System.getenv("GITHUB_RUN_NUMBER")
 private val isReleasePublication = System.getenv("RELEASE_PUBLICATION")?.toBoolean() ?: false
 
-private val baseVersion = "0.12.0"
+private val baseVersion = "0.12.1"
 
 allprojects {
     group = "com.agentclientprotocol"