diff --git a/build.gradle b/build.gradle
index daa4a101e..d34338172 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,6 @@ buildscript {
   ext.versions = [
       'minSdk': 14,
       'compileSdk': 26,
-      'buildTools': '26.0.1',
 
       'supportLibrary': '26.0.2',
       'androidPlugin': '3.0.0-beta7',
@@ -42,6 +41,7 @@ buildscript {
           'service': 'com.google.auto.service:auto-service:1.0-rc3',
           'common': 'com.google.auto:auto-common:0.8',
       ],
+      'guava': 'com.google.guava:guava:23.0',
       'release': [
           'runtime': "com.jakewharton:butterknife:${versions.release}",
           'compiler': "com.jakewharton:butterknife-compiler:${versions.release}"
diff --git a/butterknife-compiler/build.gradle b/butterknife-compiler/build.gradle
index 46d32b84a..5775e644e 100644
--- a/butterknife-compiler/build.gradle
+++ b/butterknife-compiler/build.gradle
@@ -7,6 +7,7 @@ targetCompatibility = JavaVersion.VERSION_1_7
 dependencies {
   implementation project(':butterknife-annotations')
   implementation deps.auto.common
+  implementation deps.guava
   api deps.javapoet
   compileOnly deps.auto.service
   compileOnly files(org.gradle.internal.jvm.Jvm.current().getToolsJar())
diff --git a/butterknife-integration-test/build.gradle b/butterknife-integration-test/build.gradle
index 245a4f57e..f06fe6782 100644
--- a/butterknife-integration-test/build.gradle
+++ b/butterknife-integration-test/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   compileOptions {
     sourceCompatibility = JavaVersion.VERSION_1_7
diff --git a/butterknife/build.gradle b/butterknife/build.gradle
index 9b3c7f534..623a32c01 100644
--- a/butterknife/build.gradle
+++ b/butterknife/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.library'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     minSdkVersion versions.minSdk
diff --git a/sample/app/build.gradle b/sample/app/build.gradle
index 7570238c2..1125c960d 100644
--- a/sample/app/build.gradle
+++ b/sample/app/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   compileOptions {
     sourceCompatibility = JavaVersion.VERSION_1_7
diff --git a/sample/library/build.gradle b/sample/library/build.gradle
index 27111f3ee..180017472 100644
--- a/sample/library/build.gradle
+++ b/sample/library/build.gradle
@@ -15,7 +15,6 @@ apply plugin: 'com.jakewharton.butterknife'
 
 android {
   compileSdkVersion versions.compileSdk
-  buildToolsVersion versions.buildTools
 
   defaultConfig {
     minSdkVersion versions.minSdk