diff --git a/build.gradle b/build.gradle
index db92807c4b..ec252ac0bb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,7 +25,7 @@ allprojects {
         appName = 'Mindustry'
         gdxVersion = '1.9.8'
         aiVersion = '1.8.1'
-        uCoreVersion = 'e6e2342'
+        uCoreVersion = 'a4f1863'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/assets/version.properties b/core/assets/version.properties
index 719fc49245..0e03c7b529 100644
--- a/core/assets/version.properties
+++ b/core/assets/version.properties
@@ -1,7 +1,7 @@
 #Autogenerated file. Do not modify.
-#Tue Mar 27 23:14:38 EDT 2018
+#Tue Mar 27 23:20:43 EDT 2018
 version=release
-androidBuildCode=686
+androidBuildCode=690
 name=Mindustry
 code=3.4
 build=custom build