diff --git a/CHANGELOG.md b/CHANGELOG.md
index f31a4a61..0d30ad0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Removed
 
+- Remove `DeclarationBlock::setSelector()` (#560)
 - Drop support for PHP < 7.2 (#420)
 
 ### Fixed
diff --git a/src/RuleSet/DeclarationBlock.php b/src/RuleSet/DeclarationBlock.php
index 23716724..78386d41 100644
--- a/src/RuleSet/DeclarationBlock.php
+++ b/src/RuleSet/DeclarationBlock.php
@@ -156,18 +156,6 @@ public function getSelector()
         return $this->getSelectors();
     }
 
-    /**
-     * @param Selector|string $mSelector
-     * @param CSSList|null $oList
-     *
-     * @return void
-     *
-     * @deprecated will be removed in version 9.0; use `setSelectors()` instead
-     */
-    public function setSelector($mSelector, $oList = null)
-    {
-        $this->setSelectors($mSelector, $oList);
-    }
 
     /**
      * @return array<int, Selector|string>