diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 36c89370..81b9494e 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -34,7 +34,7 @@
     <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
 
     <uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="14"
         android:targetSdkVersion="26" />
 
 </manifest>
diff --git a/build.gradle b/build.gradle
index c97858bf..3fe45e41 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,26 +1,29 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.1.2'
     }
 }
 
 apply plugin: 'com.android.library'
 
-repositories {
-    jcenter()
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
 }
 
 dependencies {
-    compile 'org.apache.jackrabbit:jackrabbit-webdav:2.12.4'
-    compile 'com.squareup.okhttp3:okhttp:3.10.0'
+    api 'org.apache.jackrabbit:jackrabbit-webdav:2.12.4'
+    api 'com.squareup.okhttp3:okhttp:3.10.0'
 }
 
 android {
     compileSdkVersion 26
-    buildToolsVersion '26.0.2'
 
     sourceSets {
         main {
@@ -34,7 +37,7 @@ android {
         }
 
         // Move the tests to tests/java, tests/res, etc...
-        instrumentTest.setRoot('tests')
+        androidTest.setRoot('tests')
 
         // Move the build types to build-types/<type>
         // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a04cf10f..267dfc1e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ 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-4.4-all.zip
\ No newline at end of file
diff --git a/sample_client/build.gradle b/sample_client/build.gradle
index 2c7a6b08..c0f96865 100644
--- a/sample_client/build.gradle
+++ b/sample_client/build.gradle
@@ -5,12 +5,11 @@ repositories {
 }
 
 dependencies {
-    compile project(':')
+    implementation project(':')
 }
 
 android {
     compileSdkVersion 26
-    buildToolsVersion "26.0.2"
 
     sourceSets {
         main {
@@ -24,7 +23,7 @@ android {
         }
 
         // Move the tests to tests/java, tests/res, etc...
-        instrumentTest.setRoot('tests')
+        androidTest.setRoot('tests')
 
         // Move the build types to build-types/<type>
         // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
@@ -43,9 +42,4 @@ android {
     packagingOptions {
         exclude 'META-INF/LICENSE.txt'
     }
-    android {
-        lintOptions {
-            abortOnError false
-        }
-    }
 }
diff --git a/sample_client/gradle/wrapper/gradle-wrapper.properties b/sample_client/gradle/wrapper/gradle-wrapper.properties
index 122a0dca..fc5d4423 100644
--- a/sample_client/gradle/wrapper/gradle-wrapper.properties
+++ b/sample_client/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
\ No newline at end of file
diff --git a/test_client/AndroidManifest.xml b/test_client/AndroidManifest.xml
index 1d7ae35e..14de3eab 100644
--- a/test_client/AndroidManifest.xml
+++ b/test_client/AndroidManifest.xml
@@ -38,7 +38,7 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
 	<uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="14"
         android:targetSdkVersion="26" />
 
     <application
diff --git a/test_client/build.gradle b/test_client/build.gradle
index 319d157b..8d01b841 100644
--- a/test_client/build.gradle
+++ b/test_client/build.gradle
@@ -6,13 +6,11 @@ repositories {
 }
 
 dependencies {
-    compile 'commons-httpclient:commons-httpclient:3.1'
-    compile project(':')
+    implementation project(':')
 }
 
 android {
     compileSdkVersion 26
-    buildToolsVersion "26.0.2"
 
     sourceSets {
         main {
@@ -26,7 +24,7 @@ android {
         }
 
         // Move the tests to tests/java, tests/res, etc...
-        instrumentTest.setRoot('tests')
+        androidTest.setRoot('tests')
 
         // Move the build types to build-types/<type>
         // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
@@ -45,9 +43,4 @@ android {
     packagingOptions {
         exclude 'META-INF/LICENSE.txt'
     }
-    android {
-        lintOptions {
-            abortOnError false
-        }
-    }
 }
diff --git a/test_client/gradle/wrapper/gradle-wrapper.properties b/test_client/gradle/wrapper/gradle-wrapper.properties
index 122a0dca..fc5d4423 100644
--- a/test_client/gradle/wrapper/gradle-wrapper.properties
+++ b/test_client/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
\ No newline at end of file
diff --git a/test_client/tests/AndroidManifest.xml b/test_client/tests/AndroidManifest.xml
index b5aaeb57..92d36c4f 100644
--- a/test_client/tests/AndroidManifest.xml
+++ b/test_client/tests/AndroidManifest.xml
@@ -28,7 +28,7 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
-    <uses-sdk android:minSdkVersion="8" />
+    <uses-sdk android:minSdkVersion="14" />
     <application>
         <uses-library android:name="android.test.runner" />
     </application>
diff --git a/test_client/tests/build.gradle b/test_client/tests/build.gradle
index b9a2b5a1..33b017fb 100644
--- a/test_client/tests/build.gradle
+++ b/test_client/tests/build.gradle
@@ -1,13 +1,12 @@
 apply plugin: 'com.android.application'
 
 dependencies {
-    compile fileTree(dir: 'libs', include: '*.jar')
-    compile project(':')
+    implementation fileTree(dir: 'libs', include: '*.jar')
+    implementation project(':')
 }
 
 android {
     compileSdkVersion 26
-    buildToolsVersion "26.0.2"
 
     sourceSets {
         main {
@@ -21,7 +20,7 @@ android {
         }
 
         // Move the tests to tests/java, tests/res, etc...
-        instrumentTest.setRoot('tests')
+        androidTest.setRoot('tests')
 
         // Move the build types to build-types/<type>
         // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...