diff --git a/app/build.gradle b/app/build.gradle
index c7b95421b..1472c43a4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -179,7 +179,7 @@ task filterAbout {
     inputs.files files(["src/main/templates/about.html",
                         "src/main/AndroidManifest.xml"])
     outputs.file "src/main/assets/about.html"
-} << {
+} doLast {
     copy {
         from "src/main/templates/about.html"
         into "src/main/assets"
diff --git a/build.gradle b/build.gradle
index 47a4021a4..fbd0209af 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:2.2.3"
+        classpath "com.android.tools.build:gradle:2.3.3"
         classpath "me.tatarka:gradle-retrolambda:3.3.1"
         classpath "me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2"
         classpath "com.github.triplet.gradle:play-publisher:1.1.4"
@@ -68,7 +68,7 @@ project.ext {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = "3.5"
+    gradleVersion = "4.2"
 }
 
 // free build hack: common functions
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index f55326309..736fb7d3f 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 304cdd1fd..52dd1f044 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Wed May 31 17:07:18 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.2-bin.zip
diff --git a/gradlew b/gradlew
index 4453ccea3..cccdd3d51 100755
--- a/gradlew
+++ b/gradlew
@@ -33,11 +33,11 @@ DEFAULT_JVM_OPTS=""
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +155,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }