diff --git a/src/LocalDate.php b/src/LocalDate.php
index a267b7a..fcc10b6 100644
--- a/src/LocalDate.php
+++ b/src/LocalDate.php
@@ -786,13 +786,13 @@ public function toISOString(): string
     {
         // This code is optimized for high performance
         return ($this->year < 1000 && $this->year > -1000
-                ? (
-                    $this->year < 0
-                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
-                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
-                )
-                : $this->year
+            ? (
+                $this->year < 0
+                    ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                    : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
             )
+            : $this->year
+        )
             . '-'
             . ($this->month < 10 ? '0' . $this->month : $this->month)
             . '-'
diff --git a/src/Month.php b/src/Month.php
index b6dd5cc..c9e3955 100644
--- a/src/Month.php
+++ b/src/Month.php
@@ -9,7 +9,7 @@
 /**
  * Represents a month-of-year such as January.
  */
-enum Month : int implements JsonSerializable
+enum Month: int implements JsonSerializable
 {
     case JANUARY = 1;
     case FEBRUARY = 2;
diff --git a/src/YearMonth.php b/src/YearMonth.php
index 989b78a..be9524a 100644
--- a/src/YearMonth.php
+++ b/src/YearMonth.php
@@ -320,13 +320,13 @@ public function toISOString(): string
     {
         // This code is optimized for high performance
         return ($this->year < 1000 && $this->year > -1000
-                ? (
-                    $this->year < 0
-                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
-                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
-                )
-                : $this->year
+            ? (
+                $this->year < 0
+                    ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                    : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
             )
+            : $this->year
+        )
             . '-'
             . ($this->month < 10 ? '0' . $this->month : $this->month);
     }
diff --git a/src/YearWeek.php b/src/YearWeek.php
index d6c190f..1f4427c 100644
--- a/src/YearWeek.php
+++ b/src/YearWeek.php
@@ -314,13 +314,13 @@ public function toISOString(): string
     {
         // This code is optimized for high performance
         return ($this->year < 1000 && $this->year > -1000
-                ? (
-                    $this->year < 0
-                        ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
-                        : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
-                )
-                : $this->year
+            ? (
+                $this->year < 0
+                    ? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
+                    : str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
             )
+            : $this->year
+        )
             . '-W'
             . ($this->week < 10 ? '0' . $this->week : $this->week);
     }
diff --git a/tools/ecs/composer.json b/tools/ecs/composer.json
index c391767..1bb0fc2 100644
--- a/tools/ecs/composer.json
+++ b/tools/ecs/composer.json
@@ -1,8 +1,8 @@
 {
     "require": {
-        "symplify/easy-coding-standard": "^10.3",
-        "slevomat/coding-standard": "^7.2",
-        "squizlabs/php_codesniffer": "^3.7"
+        "symplify/easy-coding-standard": "^12.1",
+        "slevomat/coding-standard": "^8.15",
+        "squizlabs/php_codesniffer": "^3.9"
     },
     "config": {
         "allow-plugins": {