diff --git a/CHANGELOG.md b/CHANGELOG.md
index b89d227..921b397 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 - Enh #102: Add `CombinedRegexp` class (@xepozz)
 
+## 2.1.2 July 27, 2023
+
+- Bug #105: Fix incorrect split UTF-8 strings in `StringHelper::split()` method (@vjik)
+
 ## 2.1.1 April 28, 2023
 
 - Enh #85: Improve `StringHelper::parsePath()` method annotation (@vjik)
diff --git a/src/StringHelper.php b/src/StringHelper.php
index 46681ad..6f297ee 100644
--- a/src/StringHelper.php
+++ b/src/StringHelper.php
@@ -496,7 +496,7 @@ public static function base64UrlDecode(string $input): string
     public static function split(string $string, string $separator = '\R'): array
     {
         $string = preg_replace('(^\s*|\s*$)', '', $string);
-        return preg_split('~\s*' . $separator . '\s*~', $string, -1, PREG_SPLIT_NO_EMPTY);
+        return preg_split('~\s*' . $separator . '\s*~u', $string, -1, PREG_SPLIT_NO_EMPTY);
     }
 
     /**
diff --git a/tests/StringHelperTest.php b/tests/StringHelperTest.php
index a2b15da..4f16c46 100644
--- a/tests/StringHelperTest.php
+++ b/tests/StringHelperTest.php
@@ -407,6 +407,10 @@ public function dataSplit(): array
                 "\0\nA\nB",
                 ["\0", 'A', 'B'],
             ],
+            [
+                "технический\nдолг",
+                ['технический', 'долг'],
+            ],
         ];
     }