diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 5cd135a0..9bba60da 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -14,6 +14,7 @@
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />
+        <option name="useQualifiedModuleNames" value="true" />
       </GradleProjectSettings>
     </option>
   </component>
diff --git a/app/build.gradle b/app/build.gradle
index a788a19d..c3b34049 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -38,7 +38,7 @@ android {
         minSdkVersion 16
         targetSdkVersion 30
         versionCode 63
-        versionName "5.1.4-hotfix1"
+        versionName "5.1.5"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
@@ -83,7 +83,7 @@ dependencies {
     implementation "androidx.appcompat:appcompat:1.2.0"
     implementation "androidx.activity:activity-ktx:1.2.0-beta01"
     implementation "androidx.fragment:fragment-ktx:1.3.0-beta01"
-    implementation "androidx.preference:preference:1.1.1"
+    implementation "androidx.preference:preference-ktx:1.1.1"
     implementation "androidx.constraintlayout:constraintlayout:2.0.2"
     implementation "androidx.gridlayout:gridlayout:1.0.0"
     implementation "androidx.biometric:biometric:1.0.1"
@@ -123,7 +123,7 @@ dependencies {
     implementation "ru.noties.markwon:core:3.1.0"
 
     implementation "xyz.quaver:libpupil:1.7.2"
-    implementation "xyz.quaver:documentfilex:0.3.1"
+    implementation "xyz.quaver:documentfilex:0.4-alpha02"
     implementation "xyz.quaver:floatingsearchview:1.0.7"
 
     testImplementation "junit:junit:4.13"
diff --git a/build.gradle b/build.gradle
index 71d6cbec..1a8fd9ad 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.2'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index e7a75faf..52c5f178 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Oct 01 20:54:37 KST 2020
+#Tue Oct 13 22:37:11 KST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip