diff --git a/build.gradle b/build.gradle
index c4a3c01..d8aa065 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,9 +1,8 @@
 buildscript {
   ext.versions = [
       'minSdk': 14,
-      'compileSdk': 26,
-      'buildTools': '26.0.2',
-      'supportLibrary': '26.0.2'
+      'compileSdk': 27,
+      'supportLibrary': '27.0.2'
   ]
 
   ext.deps = [
@@ -19,14 +18,14 @@ buildscript {
     ],
     'junit': 'junit:junit:4.12',
     'assertj': 'org.assertj:assertj-core:3.8.0',
-    'mockito': 'org.mockito:mockito-core:2.10.0',
+    'mockito': 'org.mockito:mockito-core:2.13.0',
     'robolectric': 'org.robolectric:robolectric:3.4.2',
     'antTasks': 'org.apache.maven:maven-ant-tasks:2.1.3',
   ]
 
   dependencies {
-    classpath 'com.android.tools.build:gradle:3.0.0-rc1'
-    classpath 'com.github.ben-manes:gradle-versions-plugin:0.15.0'
+    classpath 'com.android.tools.build:gradle:3.0.1'
+    classpath 'com.github.ben-manes:gradle-versions-plugin:0.17.0'
   }
 
   repositories {
diff --git a/flow-sample-basic/build.gradle b/flow-sample-basic/build.gradle
index bd9bd20..9236392 100644
--- a/flow-sample-basic/build.gradle
+++ b/flow-sample-basic/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.basic"
diff --git a/flow-sample-helloworld/build.gradle b/flow-sample-helloworld/build.gradle
index 3b34a99..4998aa9 100644
--- a/flow-sample-helloworld/build.gradle
+++ b/flow-sample-helloworld/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.helloworld"
diff --git a/flow-sample-intents/build.gradle b/flow-sample-intents/build.gradle
index 9e0f1a1..6436fc0 100644
--- a/flow-sample-intents/build.gradle
+++ b/flow-sample-intents/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.intents"
diff --git a/flow-sample-multikey/build.gradle b/flow-sample-multikey/build.gradle
index 472ad0c..1dd05a5 100644
--- a/flow-sample-multikey/build.gradle
+++ b/flow-sample-multikey/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.multikey"
diff --git a/flow-sample-orientation-lock/build.gradle b/flow-sample-orientation-lock/build.gradle
index 48f6d0e..319d940 100644
--- a/flow-sample-orientation-lock/build.gradle
+++ b/flow-sample-orientation-lock/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.orientation"
diff --git a/flow-sample-tree/build.gradle b/flow-sample-tree/build.gradle
index 94c1f11..217ec52 100644
--- a/flow-sample-tree/build.gradle
+++ b/flow-sample-tree/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     applicationId "flow.sample.tree"
diff --git a/flow/build.gradle b/flow/build.gradle
index 2b05fe6..814cb98 100644
--- a/flow/build.gradle
+++ b/flow/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.library'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     minSdkVersion versions.minSdk