diff --git a/app/build.gradle b/app/build.gradle
index d1319ac7..18f0cf45 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,7 +4,6 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 27
-    buildToolsVersion '27.0.2'
 
     defaultConfig {
         applicationId "com.simplemobiletools.calculator"
@@ -40,7 +39,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.3.12'
+    implementation 'com.simplemobiletools:commons:3.7.6'
     implementation 'me.grantland:autofittextview:0.2.1'
 
     testImplementation 'junit:junit:4.12'
diff --git a/app/src/main/res/drawable/button_pressed.xml b/app/src/main/res/drawable/button_pressed.xml
index 784a2ccc..e6fe04b7 100644
--- a/app/src/main/res/drawable/button_pressed.xml
+++ b/app/src/main/res/drawable/button_pressed.xml
@@ -2,5 +2,5 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
     <solid
-        android:color="@color/dark_grey_pressed_mask"/>
+        android:color="@color/pressed_item_foreground"/>
 </shape>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 9c073a1e..d781ec5f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="dark_grey_pressed_mask">#11000000</color>
+
 </resources>
diff --git a/build.gradle b/build.gradle
index 89e92a15..cc21c03a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.0'
+    ext.kotlin_version = '1.2.10'
 
     repositories {
         jcenter()
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 13da25f7..ecd43e7a 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-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-all.zip