diff --git a/docs/quickstart/build.gradle b/docs/quickstart/build.gradle
index d7a7f09d..7389b86b 100644
--- a/docs/quickstart/build.gradle
+++ b/docs/quickstart/build.gradle
@@ -2,8 +2,8 @@ apply plugin: 'java'
 apply plugin: 'application'
 
 mainClassName = 'DocsQuickstart'
-sourceCompatibility = 1.7
-targetCompatibility = 1.7
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
 version = '1.0'
 
 repositories {
diff --git a/sheets/quickstart/build.gradle b/sheets/quickstart/build.gradle
index 08d14122..ade2b272 100644
--- a/sheets/quickstart/build.gradle
+++ b/sheets/quickstart/build.gradle
@@ -2,8 +2,8 @@ apply plugin: 'java'
 apply plugin: 'application'
 
 mainClassName = 'SheetsQuickstart'
-sourceCompatibility = 1.7
-targetCompatibility = 1.7
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
 version = '1.0'
 
 repositories {
diff --git a/slides/quickstart/build.gradle b/slides/quickstart/build.gradle
index 2b2da024..8d86e30b 100644
--- a/slides/quickstart/build.gradle
+++ b/slides/quickstart/build.gradle
@@ -2,8 +2,8 @@ apply plugin: 'java'
 apply plugin: 'application'
 
 mainClassName = 'SlidesQuickstart'
-sourceCompatibility = 1.7
-targetCompatibility = 1.7
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
 version = '1.0'
 
 repositories {