diff --git a/build.gradle b/build.gradle
index 9665319fa..a7cff2807 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,10 +2,15 @@
 
 buildscript {
     repositories {
+
+        maven {
+            url 'https://maven.google.com'
+        }
+
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.2'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
     }
@@ -16,7 +21,18 @@ allprojects {
     group = 'com.rmtheis'
     version = '8.0.0'
 
+    project.ext {
+        compileSdkVersion=27
+        buildToolsVersion='27.0.2'
+        androidSupportVersion='27.0.2'
+    }
+
     repositories {
+
+        maven {
+            url 'https://maven.google.com'
+        }
+
         jcenter()
     }
 }
diff --git a/eyes-two/build.gradle b/eyes-two/build.gradle
index 2dc45ff77..0bd43fdcc 100644
--- a/eyes-two/build.gradle
+++ b/eyes-two/build.gradle
@@ -6,14 +6,14 @@ Properties properties = new Properties()
 properties.load(project.rootProject.file('local.properties').newDataInputStream())
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '25.0.0'
+    compileSdkVersion project.ext.compileSdkVersion
+    buildToolsVersion project.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion 9
-        targetSdkVersion 9
+        targetSdkVersion 22
         versionCode 1
-        versionName "1.0"
+        versionName '1.0'
     }
 
     sourceSets {
@@ -59,6 +59,6 @@ android {
 }
 
 dependencies {
-    compile project(':tess-two');
+    compile project(':tess-two')
     compile fileTree(dir: 'libs', include: ['*.jar'])
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index f85a41816..442fdc5fa 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Apr 02 14:22:01 PDT 2017
+#Fri Dec 15 09:15:44 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
diff --git a/tess-two-test/build.gradle b/tess-two-test/build.gradle
index 49e45b13a..c76727250 100644
--- a/tess-two-test/build.gradle
+++ b/tess-two-test/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '25.0.0'
+    compileSdkVersion project.ext.compileSdkVersion
+    buildToolsVersion project.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion 9
         targetSdkVersion 22
         versionCode 1
-        versionName "1.0"
+        versionName '1.0'
     }
 
     sourceSets {
@@ -28,7 +28,6 @@ android {
 }
 
 dependencies {
-    compile project(':tess-two');
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile project(':tess-two')
     testCompile 'junit:junit:4.12'
-}
+}
\ No newline at end of file
diff --git a/tess-two/build.gradle b/tess-two/build.gradle
index bcbb63f23..0e89158a7 100644
--- a/tess-two/build.gradle
+++ b/tess-two/build.gradle
@@ -8,14 +8,14 @@ Properties properties = new Properties()
 properties.load(project.rootProject.file('local.properties').newDataInputStream())
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '25.0.3'
+    compileSdkVersion project.ext.compileSdkVersion
+    buildToolsVersion project.ext.buildToolsVersion
 
     defaultConfig {
         minSdkVersion 9
         targetSdkVersion 22
         versionCode 1
-        versionName "1.0"
+        versionName '1.0'
         consumerProguardFiles 'proguard-rules.pro'
     }
 
@@ -61,7 +61,7 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:support-annotations:25.3.1'
+    compile "com.android.support:support-annotations:$project.ext.androidSupportVersion"
 }