diff --git a/UnicodeString.php b/UnicodeString.php
index 81bf8ea..16945b7 100644
--- a/UnicodeString.php
+++ b/UnicodeString.php
@@ -268,7 +268,7 @@ public function slice(int $start = 0, int $length = null): AbstractString
     {
         $str = clone $this;
         try {
-            $str->string = (string) grapheme_substr($this->string, $start, $length ?? \PHP_INT_MAX);
+            $str->string = (string) grapheme_substr($this->string, $start, $length ?? 2147483647);
         } catch (\ValueError $e) {
             $str->string = '';
         }
@@ -280,8 +280,8 @@ public function splice(string $replacement, int $start = 0, int $length = null):
     {
         $str = clone $this;
         $start = $start ? \strlen(grapheme_substr($this->string, 0, $start)) : 0;
-        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length ?? \PHP_INT_MAX)) : $length;
-        $str->string = substr_replace($this->string, $replacement, $start, $length ?? \PHP_INT_MAX);
+        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length ?? 2147483647)) : $length;
+        $str->string = substr_replace($this->string, $replacement, $start, $length ?? 2147483647);
         normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
 
         if (false === $str->string) {
@@ -293,7 +293,7 @@ public function splice(string $replacement, int $start = 0, int $length = null):
 
     public function split(string $delimiter, int $limit = null, int $flags = null): array
     {
-        if (1 > $limit = $limit ?? \PHP_INT_MAX) {
+        if (1 > $limit = $limit ?? 2147483647) {
             throw new InvalidArgumentException('Split limit must be a positive integer.');
         }
 
diff --git a/composer.json b/composer.json
index 6d89808..b77be0b 100644
--- a/composer.json
+++ b/composer.json
@@ -37,5 +37,7 @@
         ]
     },
     "minimum-stability": "dev",
-    "version": "5.2.x-dev"
+    "extra": {
+        "branch-version": "5.2-dev"
+    }
 }