diff --git a/app/build.gradle b/app/build.gradle
index a07437ea..6923f2f0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -71,10 +71,6 @@ android {
         targetCompatibility = "8"
         sourceCompatibility = "8"
     }
-
-    kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8.toString()
-    }
 }
 
 dependencies {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5d48f34c..7974a1c9 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -13,8 +13,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="space.celestia.mobilecelestia"
-    android:versionCode="177"
-    android:versionName="1.3.1">
+    android:versionCode="178"
+    android:versionName="1.3.2">
 
     <uses-feature android:glEsVersion="0x00020000" android:required="true" />
     <uses-permission android:name="android.permission.INTERNET"/>
diff --git a/app/src/main/java/space/celestia/mobilecelestia/favorite/FavoriteItemRecyclerViewAdapter.kt b/app/src/main/java/space/celestia/mobilecelestia/favorite/FavoriteItemRecyclerViewAdapter.kt
index 14c285e2..ac12a485 100644
--- a/app/src/main/java/space/celestia/mobilecelestia/favorite/FavoriteItemRecyclerViewAdapter.kt
+++ b/app/src/main/java/space/celestia/mobilecelestia/favorite/FavoriteItemRecyclerViewAdapter.kt
@@ -11,6 +11,7 @@
 
 package space.celestia.mobilecelestia.favorite
 
+import android.os.Build
 import android.view.LayoutInflater
 import android.view.Menu
 import android.view.View
@@ -236,19 +237,21 @@ class FavoriteItemRecyclerViewAdapter private constructor(
                     }
                     return@setOnLongClickListener true
                 }
-                holder.itemView.setOnContextClickListener {
-                    val popup = PopupMenu(it.context, it)
-                    setupPopupMenu(popup, actions) { menuItem ->
-                        when (menuItem) {
-                            FavoriteItemAction.Delete -> {
-                                listener?.deleteFavoriteItem(children.indexOf(item))
-                            }
-                            FavoriteItemAction.Rename -> {
-                                listener?.renameFavoriteItem(item)
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                    holder.itemView.setOnContextClickListener {
+                        val popup = PopupMenu(it.context, it)
+                        setupPopupMenu(popup, actions) { menuItem ->
+                            when (menuItem) {
+                                FavoriteItemAction.Delete -> {
+                                    listener?.deleteFavoriteItem(children.indexOf(item))
+                                }
+                                FavoriteItemAction.Rename -> {
+                                    listener?.renameFavoriteItem(item)
+                                }
                             }
                         }
+                        return@setOnContextClickListener true
                     }
-                    return@setOnContextClickListener true
                 }
             } else {
                 holder.itemView.setOnLongClickListener(null)
diff --git a/app/src/main/java/space/celestia/mobilecelestia/toolbar/ToolbarFragment.kt b/app/src/main/java/space/celestia/mobilecelestia/toolbar/ToolbarFragment.kt
index 8f8d7e94..30a3e4c5 100644
--- a/app/src/main/java/space/celestia/mobilecelestia/toolbar/ToolbarFragment.kt
+++ b/app/src/main/java/space/celestia/mobilecelestia/toolbar/ToolbarFragment.kt
@@ -49,7 +49,7 @@ enum class ToolbarAction : Serializable {
 
     val imageName: String
         get() {
-            return "toolbar_" + toString().toLowerCase(Locale.ENGLISH)
+            return "toolbar_" + toString().lowercase(Locale.US)
         }
 
     companion object {
diff --git a/build.gradle b/build.gradle
index 03d35dcf..942b3de3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,25 +12,23 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.4.32'
+    ext.kotlin_version = '1.5.0'
+
     repositories {
         google()
-        jcenter()
-        
+        mavenCentral()
     }
+
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:4.2.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
     }
 }
 
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index b7573601..c82c67c1 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-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip