diff --git a/.travis.yml b/.travis.yml
index 61f5f6f9..86b9e3a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ env:
 
 android:
   components:
-  - build-tools-27.0.1
+  - build-tools-27.0.3
 
 jdk:
   - oraclejdk8
diff --git a/gradle.properties b/gradle.properties
index 3cc44b7b..5bc97725 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -48,7 +48,7 @@ KOTLIN_VERSION                              = 1.2.0
 # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 # Android Environment (common)
 COMPILE_SDK_VERSION                         = android-27
-BUILD_TOOLS_VERSION                         = 27.0.1
+BUILD_TOOLS_VERSION                         = 27.0.3
 TARGET_SDK_VERSION                          = 27
 
 # Android Environment (sample)