diff --git a/.idea/libraries/constraint_layout_1_0_2.xml b/.idea/libraries/constraint_layout_1_0_2.xml
deleted file mode 100644
index ae7ec8d9..00000000
--- a/.idea/libraries/constraint_layout_1_0_2.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="constraint-layout-1.0.2">
-    <CLASSES>
-      <root url="file://$USER_HOME$/.android/build-cache/983cd9976ef510b2538361561f2ee91f1200f245/output/res" />
-      <root url="jar://$USER_HOME$/.android/build-cache/983cd9976ef510b2538361561f2ee91f1200f245/output/jars/classes.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file
diff --git a/.idea/libraries/constraint_layout_solver_1_0_2.xml b/.idea/libraries/constraint_layout_solver_1_0_2.xml
deleted file mode 100644
index 75255581..00000000
--- a/.idea/libraries/constraint_layout_solver_1_0_2.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="constraint-layout-solver-1.0.2">
-    <CLASSES>
-      <root url="jar://$USER_HOME$/AppData/Local/Android/Sdk/extras/m2repository/com/android/support/constraint/constraint-layout-solver/1.0.2/constraint-layout-solver-1.0.2.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file
diff --git a/.idea/libraries/core_1_9_8.xml b/.idea/libraries/core_1_9_8.xml
deleted file mode 100644
index 0be1e35c..00000000
--- a/.idea/libraries/core_1_9_8.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="core-1.9.8">
-    <CLASSES>
-      <root url="jar://$USER_HOME$/.android/build-cache/db7eb580bfa6467818ef12c5f1fa42273b50aa3a/output/jars/classes.jar!/" />
-      <root url="file://$USER_HOME$/.android/build-cache/db7eb580bfa6467818ef12c5f1fa42273b50aa3a/output/res" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file
diff --git a/.idea/libraries/core_3_3_0.xml b/.idea/libraries/core_3_3_0.xml
deleted file mode 100644
index de46baa5..00000000
--- a/.idea/libraries/core_3_3_0.xml
+++ /dev/null
@@ -1,11 +0,0 @@
-<component name="libraryTable">
-  <library name="core-3.3.0">
-    <CLASSES>
-      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.google.zxing/core/3.3.0/73c49077166faa4c3c0059c5f583d1d7bd1475fe/core-3.3.0.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES>
-      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.google.zxing/core/3.3.0/39d966e052e28fc7d83793b02e0af97ccf955745/core-3.3.0-sources.jar!/" />
-    </SOURCES>
-  </library>
-</component>
\ No newline at end of file
diff --git a/.idea/libraries/zxing_1_9_8.xml b/.idea/libraries/zxing_1_9_8.xml
deleted file mode 100644
index e9af3efd..00000000
--- a/.idea/libraries/zxing_1_9_8.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="zxing-1.9.8">
-    <CLASSES>
-      <root url="jar://$USER_HOME$/.android/build-cache/8d8f2e0e10c7af73321454f6fa481e8e5438e654/output/jars/classes.jar!/" />
-      <root url="file://$USER_HOME$/.android/build-cache/8d8f2e0e10c7af73321454f6fa481e8e5438e654/output/res" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 53f6e24c..999189e9 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'witness'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    buildToolsVersion '26.0.2'
     defaultConfig {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
diff --git a/build.gradle b/build.gradle
index 9d495e2d..69f9fc4b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.0'
         classpath files('external-libs/gradle-witness.jar')
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 8e2e9791..30a223c5 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sat Apr 15 09:39:07 CEST 2017
+#Wed Oct 25 23:06:49 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip