diff --git a/app/build.gradle b/app/build.gradle
index 587c6562..59484a90 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -45,7 +45,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:4.4.27'
+    implementation 'com.simplemobiletools:commons:4.5.0'
     implementation 'com.facebook.stetho:stetho:1.5.0'
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
diff --git a/app/src/main/res/menu/menu.xml b/app/src/main/res/menu/menu.xml
index 78fb4d88..5966a6cd 100644
--- a/app/src/main/res/menu/menu.xml
+++ b/app/src/main/res/menu/menu.xml
@@ -6,6 +6,16 @@
         android:icon="@drawable/ic_save"
         android:title="@string/save"
         app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/undo"
+        android:icon="@drawable/ic_undo"
+        android:title="@string/undo"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/redo"
+        android:icon="@drawable/ic_redo"
+        android:title="@string/redo"
+        app:showAsAction="ifRoom"/>
     <item
         android:id="@+id/open_note"
         android:icon="@drawable/ic_open"