diff --git a/Build/php-cs-fixer/config.php b/Build/php-cs-fixer/config.php
index 807b376f..9f24d676 100644
--- a/Build/php-cs-fixer/config.php
+++ b/Build/php-cs-fixer/config.php
@@ -8,8 +8,8 @@
     ->setRiskyAllowed(true)
     ->setRules(
         [
-            '@PER-CS2x0' => true,
-            '@PER-CS2x0:risky' => true,
+            '@PER-CS3x0' => true,
+            '@PER-CS3x0:risky' => true,
 
             '@PHPUnit5x0Migration:risky' => true,
             '@PHPUnit5x2Migration:risky' => true,
diff --git a/src/RuleSet/RuleSet.php b/src/RuleSet/RuleSet.php
index 35b6d6b8..b011c6a5 100644
--- a/src/RuleSet/RuleSet.php
+++ b/src/RuleSet/RuleSet.php
@@ -136,8 +136,8 @@ public function addDeclaration(Declaration $declarationToAdd, ?Declaration $sibl
                 foreach ($this->declarations as $declarationsForAProperty) {
                     foreach ($declarationsForAProperty as $declaration) {
                         if (
-                            $declaration->getLineNumber() === $siblingLineNumber &&
-                            $declaration->getColumnNumber() >= $siblingColumnNumber
+                            $declaration->getLineNumber() === $siblingLineNumber
+                            && $declaration->getColumnNumber() >= $siblingColumnNumber
                         ) {
                             $declaration->setPosition($siblingLineNumber, $declaration->getColumnNumber() + 1);
                         }
diff --git a/src/Value/Color.php b/src/Value/Color.php
index df491692..e79718f0 100644
--- a/src/Value/Color.php
+++ b/src/Value/Color.php
@@ -138,8 +138,8 @@ private static function parseColorFunction(ParserState $parserState): CSSFunctio
 
             // With a `var` argument, the function can have fewer arguments.
             // And as of CSS Color Module Level 4, the alpha argument is optional.
-            $canCloseNow =
-                $containsVar
+            $canCloseNow
+                = $containsVar
                 || ($mayHaveOptionalAlpha && $argumentIndex >= $expectedArgumentCount - 2);
             if ($canCloseNow && $parserState->comes(')')) {
                 break;
diff --git a/tests/Comment/CommentTest.php b/tests/Comment/CommentTest.php
index 042a509b..5a66ec08 100644
--- a/tests/Comment/CommentTest.php
+++ b/tests/Comment/CommentTest.php
@@ -59,8 +59,8 @@ public function stripCommentsFromOutput(): void
 
         $expected1 = "\n"
             . "@import url(\"some/url.css\") screen;\n\n"
-            . ".foo, #bar {\n" .
-            "\tbackground-color: #000;\n"
+            . ".foo, #bar {\n"
+            . "\tbackground-color: #000;\n"
             . "}\n\n"
             . "@media screen {\n"
             . "\t#foo.bar {\n"
diff --git a/tests/Unit/RuleSet/DeclarationListTests.php b/tests/Unit/RuleSet/DeclarationListTests.php
index f831e618..fb9c78d9 100644
--- a/tests/Unit/RuleSet/DeclarationListTests.php
+++ b/tests/Unit/RuleSet/DeclarationListTests.php
@@ -295,8 +295,8 @@ public static function provideInitialPropertyNamesAndIndexOfOne(): array
         foreach ($initialPropertyNamesSets as $setName => $data) {
             $initialPropertyNames = $data[0];
             for ($index = 0; $index < \count($initialPropertyNames); ++$index) {
-                $initialPropertyNamesAndIndexSets[$setName . ', index ' . $index] =
-                    [$initialPropertyNames, $index];
+                $initialPropertyNamesAndIndexSets[$setName . ', index ' . $index]
+                    = [$initialPropertyNames, $index];
             }
         }
 
diff --git a/tests/Unit/Value/CSSStringTest.php b/tests/Unit/Value/CSSStringTest.php
index 6f6b5018..94196cfa 100644
--- a/tests/Unit/Value/CSSStringTest.php
+++ b/tests/Unit/Value/CSSStringTest.php
@@ -112,11 +112,11 @@ public function getArrayRepresentationIncludesContents(): void
      */
     public function doesNotEscapeSingleQuotesThatDoNotNeedToBeEscaped(): void
     {
-        $input = "data:image/svg+xml,%3Csvg width='24' height='24' viewBox='0 0 24 24' fill='none'" .
-            " xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill-rule='evenodd' clip-rule='evenodd'" .
-            " d='M14.3145 2 3V11.9987H17.5687L18 8.20761H14.3145L14.32 6.31012C14.32 5.32134 14.4207" .
-            ' 4.79153 15.9426 4.79153H17.977V1H14.7223C10.8129 1 9.43687 2.83909 9.43687 ' .
-            " 5.93187V8.20804H7V11.9991H9.43687V23H14.3145Z' fill='black'/%3E%3C/svg%3E%0A";
+        $input = "data:image/svg+xml,%3Csvg width='24' height='24' viewBox='0 0 24 24' fill='none'"
+            . " xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill-rule='evenodd' clip-rule='evenodd'"
+            . " d='M14.3145 2 3V11.9987H17.5687L18 8.20761H14.3145L14.32 6.31012C14.32 5.32134 14.4207"
+            . ' 4.79153 15.9426 4.79153H17.977V1H14.7223C10.8129 1 9.43687 2.83909 9.43687 '
+            . " 5.93187V8.20804H7V11.9991H9.43687V23H14.3145Z' fill='black'/%3E%3C/svg%3E%0A";
 
         $outputFormat = OutputFormat::createPretty();