diff --git a/Demo/BasicTunnel-iOS/ViewController.swift b/Demo/BasicTunnel-iOS/ViewController.swift
index 9796f0c..521f17d 100644
--- a/Demo/BasicTunnel-iOS/ViewController.swift
+++ b/Demo/BasicTunnel-iOS/ViewController.swift
@@ -219,7 +219,7 @@ class ViewController: UIViewController, URLSessionDataDelegate {
             return
         }
         try? vpn.sendProviderMessage(TunnelKitProvider.Message.requestLog.data) { (data) in
-            guard let log = String(data: data!, encoding: .utf8) else {
+            guard let data = data, let log = String(data: data, encoding: .utf8) else {
                 return
             }
             self.textLog.text = log
diff --git a/Demo/Podfile.lock b/Demo/Podfile.lock
index 8a51a98..35d4279 100644
--- a/Demo/Podfile.lock
+++ b/Demo/Podfile.lock
@@ -1,14 +1,14 @@
 PODS:
-  - OpenSSL-Apple (1.1.0i.2)
+  - OpenSSL-Apple (1.1.0j.2)
   - SwiftyBeaver (1.7.0)
-  - TunnelKit (1.6.2):
-    - TunnelKit/AppExtension (= 1.6.2)
-    - TunnelKit/Core (= 1.6.2)
-  - TunnelKit/AppExtension (1.6.2):
+  - TunnelKit (1.6.3):
+    - TunnelKit/AppExtension (= 1.6.3)
+    - TunnelKit/Core (= 1.6.3)
+  - TunnelKit/AppExtension (1.6.3):
     - SwiftyBeaver
     - TunnelKit/Core
-  - TunnelKit/Core (1.6.2):
-    - OpenSSL-Apple (~> 1.1.0i.2)
+  - TunnelKit/Core (1.6.3):
+    - OpenSSL-Apple (~> 1.1.0j.2)
     - SwiftyBeaver
 
 DEPENDENCIES:
@@ -24,9 +24,9 @@ EXTERNAL SOURCES:
     :path: ".."
 
 SPEC CHECKSUMS:
-  OpenSSL-Apple: 37a8c0b04df4bb8971deef4671cc29222861319c
+  OpenSSL-Apple: e88e1eb314acb4a05e2348069790c4aa49f6d319
   SwiftyBeaver: 4cc0080d2e23f980652e28978db11a5c9da39165
-  TunnelKit: 6be99150922d3f14187dc29732032712dd4400e3
+  TunnelKit: ac8dad986e36e513303ed5d258c7e4aedb45c84b
 
 PODFILE CHECKSUM: f66dfaaa92a8d04ab2743f3caeab0ac9f9f25859