diff --git a/.travis.yml b/.travis.yml
index 95e07e066..a45db1b92 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: android
 android:
   components:
     - tools
-    - build-tools-25.0.3
+    - build-tools-26.0.2
     - android-25
     - extra-android-m2repository
   licenses:
diff --git a/build.gradle b/build.gradle
index 2eac0cbf7..5d78e4de4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,11 +3,12 @@ apply from: 'checkstyle.gradle'
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.0'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.14.0'
         classpath 'org.codehaus.groovy:groovy-android-gradle-plugin:1.2.0'
     }
diff --git a/dependencies.gradle b/dependencies.gradle
index 243f687af..0d5ae74da 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -1,6 +1,5 @@
 ext {
     supportVersion = '25.3.1'
-    buildToolsVersionVariable = "25.0.3"
     rxJavaVersion = '1.3.1'
     sourceCompatibilityVersion = JavaVersion.VERSION_1_7
     targetCompatibilityVersion = JavaVersion.VERSION_1_7
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1bf6ee0d8..590f0e81d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Fri Apr 14 14:13:27 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.3-all.zip
diff --git a/gradlew b/gradlew
index 4453ccea3..cccdd3d51 100755
--- a/gradlew
+++ b/gradlew
@@ -33,11 +33,11 @@ DEFAULT_JVM_OPTS=""
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +155,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
diff --git a/mockrxandroidble/build.gradle b/mockrxandroidble/build.gradle
index 668b184df..26bd034bd 100644
--- a/mockrxandroidble/build.gradle
+++ b/mockrxandroidble/build.gradle
@@ -4,7 +4,6 @@ apply from: rootProject.file('gradle/gradle-mvn-push.gradle')
 
 android {
     compileSdkVersion 25
-    buildToolsVersion rootProject.ext.buildToolsVersionVariable
 
     defaultConfig {
         minSdkVersion 18
diff --git a/rxandroidble/build.gradle b/rxandroidble/build.gradle
index a12997e1f..33f75a263 100644
--- a/rxandroidble/build.gradle
+++ b/rxandroidble/build.gradle
@@ -4,7 +4,6 @@ apply from: rootProject.file('gradle/gradle-mvn-push.gradle')
 
 android {
     compileSdkVersion 25
-    buildToolsVersion rootProject.ext.buildToolsVersionVariable
 
     defaultConfig {
         minSdkVersion 18
@@ -43,6 +42,20 @@ android {
     preBuild.dependsOn 'checkstyle'
 }
 
+// Workaround until groovy-android-gradle-plugin 1.3.0 is released
+tasks.whenTaskAdded { task ->
+    if (task.name.contains('UnitTestGroovyWithGroovyc')) {
+        task.doFirst {
+            ['debug','release'].each {
+                def dir = file("build/generated/source/apt/test/$it")
+                if(!dir.isDirectory()){
+                    dir.mkdirs()
+                }
+            }
+        }
+    }
+}
+
 dependencies {
     compile rootProject.ext.libs.rxjava
     compile rootProject.ext.libs.rxrelay
diff --git a/sample/build.gradle b/sample/build.gradle
index 9e95fe165..f6dbb2145 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -17,7 +17,6 @@ repositories {
 
 android {
     compileSdkVersion 25
-    buildToolsVersion rootProject.ext.buildToolsVersionVariable
 
     defaultConfig {
         applicationId "com.polidea.rxandroidble.sample"