diff --git a/build.gradle b/build.gradle
index 337466e..9ca2753 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'maven-publish'
 
 ext {
-    libraryVersion = '2.1.0'
+    libraryVersion = '2.1.1'
     publishedGroupId = 'com.budiyev.android'
 }
 
@@ -41,7 +41,7 @@ android {
     defaultConfig {
         minSdkVersion 19
         targetSdkVersion 31
-        versionCode 57
+        versionCode 58
         versionName libraryVersion
     }
 
diff --git a/src/main/java/com/budiyev/android/codescanner/Rect.java b/src/main/java/com/budiyev/android/codescanner/Rect.java
index bcb1a4b..318fe25 100644
--- a/src/main/java/com/budiyev/android/codescanner/Rect.java
+++ b/src/main/java/com/budiyev/android/codescanner/Rect.java
@@ -181,6 +181,7 @@ public boolean equals(final Object obj) {
         }
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "[(" + mLeft + "; " + mTop + ") - (" + mRight + "; " + mBottom + ")]";