diff --git a/Cartfile b/Cartfile
index 83a8e2b..81327f2 100644
--- a/Cartfile
+++ b/Cartfile
@@ -1,2 +1,2 @@
-github "ReactiveX/RxSwift" "5.0.1"
+github "ReactiveX/RxSwift" "5.1.0"
 github "uber/RIBs" ~> 0.9
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 18a681a..553626e 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,2 +1,2 @@
-github "ReactiveX/RxSwift" "5.0.1"
-github "uber/RIBs" "v0.9.2"
\ No newline at end of file
+github "ReactiveX/RxSwift" "5.1.0"
+github "uber/RIBs" "v0.9.2"
diff --git a/RIBsTreeViewerClient/Sources/RIBsTreeViewer.swift b/RIBsTreeViewerClient/Sources/RIBsTreeViewer.swift
index 52307a2..02f6e27 100644
--- a/RIBsTreeViewerClient/Sources/RIBsTreeViewer.swift
+++ b/RIBsTreeViewerClient/Sources/RIBsTreeViewer.swift
@@ -65,7 +65,7 @@ public class RIBsTreeViewerImpl: RIBsTreeViewer {
                 let jsonData = try JSONSerialization.data(withJSONObject: $0)
                 let jsonString = String(bytes: jsonData, encoding: .utf8)!
                 self?.webSocket.send(text: jsonString)
-            } catch let error {
+            } catch {
             }
         })