diff --git a/app/build.gradle b/app/build.gradle
index d26954e8..b357cbab 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -45,7 +45,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.19.4'
+    implementation 'com.simplemobiletools:commons:3.19.21'
     implementation 'joda-time:joda-time:2.9.9'
     implementation 'com.facebook.stetho:stetho:1.5.0'
 
diff --git a/app/src/main/kotlin/com/simplemobiletools/contacts/adapters/ContactsAdapter.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/adapters/ContactsAdapter.kt
index ee5a9430..ca85d078 100644
--- a/app/src/main/kotlin/com/simplemobiletools/contacts/adapters/ContactsAdapter.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/contacts/adapters/ContactsAdapter.kt
@@ -117,7 +117,7 @@ class ContactsAdapter(activity: SimpleActivity, var contactItems: ArrayList<Cont
 
     fun updateItems(newItems: ArrayList<Contact>, highlightText: String = "") {
         if (newItems.hashCode() != contactItems.hashCode()) {
-            contactItems = newItems
+            contactItems = newItems.clone() as ArrayList<Contact>
             textToHighlight = highlightText
             notifyDataSetChanged()
             finishActMode()
diff --git a/build.gradle b/build.gradle
index 139d4786..1bde8c32 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong