diff --git a/app/build.gradle b/app/build.gradle
index ab592cb..b06138c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,8 +3,8 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    compileSdkVersion 26
+    buildToolsVersion "26.0.0"
 
     defaultConfig {
         applicationId "net.named_data.nfd"
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..314d8a4
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,8 @@
+# The simpliest strategy is to not run proguard against your project's own code.
+# This doesn't provide the benefits of optimization & obfuscation against your
+# project, but will still strip the libraries. The advantage is that your app will
+# work without any subsequent effort. If you choose this strategy, the proguard
+# configuration for the project is simply the line below.
+
+# -keep class net.named_data.nfd.** { * ; }
+# -keep class net.named_data.jndn.** { * ; }
diff --git a/build.gradle b/build.gradle
index 9c1a198..73d0250 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.2'
+        classpath 'com.android.tools.build:gradle:2.3.3'
         classpath 'net.named-data.playground:play-publisher:1.2.0-2-SNAPSHOT'
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index c206a6d..29be96d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Jan 31 10:27:19 PST 2016
+#Fri Jul 07 17:24:15 PDT 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0.1-bin.zip