diff --git a/app/build.gradle b/app/build.gradle
index 9335bcac0..021f48dae 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -95,7 +95,7 @@ dependencies {
     implementation 'androidx.annotation:annotation:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
     implementation 'androidx.recyclerview:recyclerview:1.3.0-alpha01'
-    implementation 'androidx.preference:preference-ktx:1.2.0-rc01'
+    implementation "androidx.preference:preference-ktx:$preference_version"
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.palette:palette-ktx:1.0.0'
 
@@ -105,10 +105,9 @@ dependencies {
     //WebServer by NanoHttpd
     implementation "org.nanohttpd:nanohttpd:2.3.1"
 
-    def nav_version = '2.4.0-rc01'
-    implementation "androidx.navigation:navigation-runtime-ktx:$nav_version"
-    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
-    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
+    implementation "androidx.navigation:navigation-runtime-ktx:$navigation_version"
+    implementation "androidx.navigation:navigation-fragment-ktx:$navigation_version"
+    implementation "androidx.navigation:navigation-ui-ktx:$navigation_version"
 
     def room_version = '2.4.0'
     implementation "androidx.room:room-runtime:$room_version"
@@ -121,7 +120,7 @@ dependencies {
     implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
 
     implementation 'com.google.android.play:core-ktx:1.8.1'
-    implementation 'com.google.android.material:material:1.5.0-beta01'
+    implementation "com.google.android.material:material:$mdc_version"
 
     def retrofit_version = '2.9.0'
     implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
@@ -138,7 +137,7 @@ dependencies {
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 
-    def kotlin_coroutines_version = '1.6.0-RC2'
+    def kotlin_coroutines_version = '1.6.0-RC3'
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_coroutines_version"
 
diff --git a/appthemehelper/build.gradle b/appthemehelper/build.gradle
index 3d9c17bb5..898a58e25 100644
--- a/appthemehelper/build.gradle
+++ b/appthemehelper/build.gradle
@@ -21,8 +21,8 @@ android {
 
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.4.0'
-    implementation 'com.google.android.material:material:1.5.0-beta01'
-    implementation 'androidx.preference:preference-ktx:1.2.0-rc01'
+    implementation "com.google.android.material:material:$mdc_version"
+    implementation "androidx.preference:preference-ktx:$preference_version"
     implementation 'androidx.cardview:cardview:1.0.0'
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
diff --git a/build.gradle b/build.gradle
index b83f8e44b..764e4911b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,6 +2,11 @@
 
 buildscript {
     ext.kotlin_version = '1.6.10'
+    ext.navigation_version = '2.4.0-rc01'
+    ext.mdc_version = '1.5.0-rc01'
+    ext.preference_version = '1.2.0-rc01'
+
+
     repositories {
         mavenCentral()
         google()
@@ -9,8 +14,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:7.0.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        def nav_version = "2.4.0-rc01"
-        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
+        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$navigation_version"
     }
 }
 plugins {