diff --git a/app/build.gradle b/app/build.gradle
index 59865125..09162e65 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -17,28 +17,29 @@
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.3.0-alpha11'
     }
 }
 apply plugin: 'com.android.application'
 
 repositories {
-    mavenCentral()
+    google()
     jcenter()
 }
 
 dependencies {
-    compile project(":libraries:Jumble")
-    compile 'com.android.support:support-v4:21.+'
-    compile 'com.android.support:appcompat-v7:21.+'
-    compile 'com.android.support:cardview-v7:21.+'
-    compile 'com.android.support:palette-v7:21.+'
-    compile 'com.android.support:recyclerview-v7:21.+'
-    compile 'org.jsoup:jsoup:1.7.2'
-    compile 'info.guardianproject.netcipher:netcipher:1.2'
+    implementation project(":libraries:Jumble")
+    implementation 'com.android.support:support-v4:21.+'
+    implementation 'com.android.support:appcompat-v7:21.+'
+    implementation 'com.android.support:cardview-v7:21.+'
+    implementation 'com.android.support:palette-v7:21.+'
+    implementation 'com.android.support:recyclerview-v7:21.+'
+    implementation 'org.jsoup:jsoup:1.7.2'
+    implementation 'info.guardianproject.netcipher:netcipher:1.2'
 }
 
 
@@ -47,12 +48,11 @@ def signingFile = file 'signing.gradle';
 if (signingFile.exists()) apply from: 'signing.gradle'
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "21.1.1"
+    compileSdkVersion 28
 
     defaultConfig {
         minSdkVersion 12
-        targetSdkVersion 21
+        targetSdkVersion 28
         applicationId "com.morlunk.mumbleclient"
         versionCode 73
         versionName "3.3.0-rc1"
@@ -60,31 +60,6 @@ android {
         buildConfigField "boolean", "DONATE_NAG", "false"
     }
 
-    productFlavors {
-
-        official {
-            applicationId "com.morlunk.mumbleclient"
-        }
-
-        free {
-            applicationId "com.morlunk.mumbleclient.free"
-            buildConfigField "boolean", "DONATE_NAG", "true"
-        }
-
-        jenkins {
-            // Abuse Jenkins environment variables. Neat.
-            def env = System.getenv()
-            if (env.containsKey("BUILD_NUMBER") && env.containsKey("BUILD_DISPLAY_NAME")) {
-                versionCode Integer.parseInt(env.get("BUILD_NUMBER"))
-                versionName env.get("BUILD_DISPLAY_NAME")
-            } else {
-                versionCode 0
-                versionName "Unknown Nightly"
-            }
-            applicationId "com.morlunk.mumbleclient.jenkins"
-        }
-    }
-
     lintOptions {
         abortOnError false
     }
diff --git a/app/src/main/java/com/morlunk/mumbleclient/app/PlumbleActivity.java b/app/src/main/java/com/morlunk/mumbleclient/app/PlumbleActivity.java
index 243358ac..915427b7 100644
--- a/app/src/main/java/com/morlunk/mumbleclient/app/PlumbleActivity.java
+++ b/app/src/main/java/com/morlunk/mumbleclient/app/PlumbleActivity.java
@@ -626,7 +626,7 @@ public void onCancel(DialogInterface dialog) {
                     }
                 });
                 mConnectingDialog.setMessage(getString(R.string.connecting_to_server, server.getHost(),
-                        server.getPort()));
+                        String.valueOf(server.getPort())));
                 mConnectingDialog.show();
                 break;
             case CONNECTION_LOST:
@@ -647,8 +647,7 @@ public void onClick(DialogInterface dialog, int which) {
                             }
                         });
                     } else if (error.getReason() == JumbleException.JumbleDisconnectReason.REJECT &&
-                               (error.getReject().getType() == Mumble.Reject.RejectType.WrongUserPW ||
-                                error.getReject().getType() == Mumble.Reject.RejectType.WrongServerPW)) {
+                               error.isAuthenticationFailure()) {
                         // FIXME(acomminos): Long conditional.
                         final EditText passwordField = new EditText(this);
                         passwordField.setInputType(InputType.TYPE_CLASS_TEXT |
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a3f369a9..00005d71 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
diff --git a/libraries/Jumble b/libraries/Jumble
index 4a0fe1d3..12ec46f9 160000
--- a/libraries/Jumble
+++ b/libraries/Jumble
@@ -1 +1 @@
-Subproject commit 4a0fe1d3c8592491809783d97f61088b98fa0027
+Subproject commit 12ec46f92eb1edbf1da35d6e0ffc678cef2b7065