diff --git a/.travis.yml b/.travis.yml
index 14945c3d9..f10ddbedb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ android:
   components:
     - tools
     - platform-tools-24.0.2
-    - build-tools-25.0.0
+    - build-tools-26.0.2
     - android-24
     - extra-android-m2repository
 before_cache:
diff --git a/app/build.gradle b/app/build.gradle
index f080515d5..f9da1b029 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,7 +7,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'io.fabric.tools:gradle:1.21.6'
+        classpath 'io.fabric.tools:gradle:1.24.3'
     }
 }
 
@@ -62,7 +62,7 @@ android {
      * Update (both Gradle and local SDK) whenever possible
      */
     compileSdkVersion 24
-    buildToolsVersion '25.0.0'
+    buildToolsVersion '26.0.2'
 
     /**
      * Build configurations for APK
@@ -168,8 +168,7 @@ dependencies {
     androidTestCompile 'com.android.support.test:runner:0.5'
     apt 'com.jakewharton:butterknife-compiler:8.4.0'
     apt 'org.projectlombok:lombok:1.16.10'
-    onlineCompile 'com.squareup.okhttp3:okhttp:3.4.1'
-    onlineCompile 'com.squareup.okio:okio:1.10.0'
+    onlineCompile 'com.squareup.okhttp3:okhttp:3.7.0'
     provided 'org.projectlombok:lombok:1.16.10'
     compile project(':openCVLibrary330')
 }
diff --git a/openCVLibrary330/build.gradle b/openCVLibrary330/build.gradle
index 64c105b6c..3da910fb3 100644
--- a/openCVLibrary330/build.gradle
+++ b/openCVLibrary330/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 24
-    buildToolsVersion "25.0.0"
+    buildToolsVersion "26.0.2"
 
     defaultConfig {
         minSdkVersion 19