diff --git a/build.gradle b/build.gradle
index 09c4125..a69e0f5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.72'
+    ext.kotlin_version = '1.4.0'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath 'com.android.tools.build:gradle:4.0.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -23,26 +23,26 @@ allprojects {
 }
 
 ext {
-    core_ktx_version = "1.3.0"
+    appcompat_version = "1.2.0"
+    constraint_layout_version = "2.0.1"
+    core_ktx_version = "1.3.1"
+    documentfile_version = "1.0.1"
     fragment_ktx_version = "1.2.5"
-    appcompat_version = "1.1.0"
-    material_version = "1.1.0"
-    preference_version = "1.1.1"
+    kotlin_coroutines_android_version = "1.3.7"
+    kotlin_coroutines_core_version = "1.3.7"
     legacy_preference_v14_version = "1.0.0"
     lifecycle_common_java8_version = "2.2.0"
-    lifecycle_runtime_version = "2.2.0"
     lifecycle_extensions_version = "2.2.0"
+    lifecycle_runtime_version = "2.2.0"
     lifecycle_viewmodel_ktx_version = "2.2.0"
-    constraint_layout_version = "1.1.3"
+    material_version = "1.2.0"
+    preference_version = "1.1.1"
     room_version = "2.2.5"
-    kotlin_coroutines_core_version = "1.3.7"
-    kotlin_coroutines_android_version = "1.3.7"
-    documentfile_version = "1.0.1"
 
     // test dependencies
     junit_version = "4.13"
-    runner_version = "1.2.0"
-    espresso_core_version = "3.2.0"
+    runner_version = "1.3.0"
+    espresso_core_version = "3.3.0"
 }
 
 task clean(type: Delete) {