diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba74cfa56..74a577d09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -81,6 +81,9 @@ Please also have a look at our
 
 ### Removed
 
+- Remove `getLineNo()` from these classes (use `getLineNumber()` instead):
+  `Comment`, `CSSList`, `SourceException`, `Charset`, `CSSNamespace`, `Import`,
+  `Rule`, `DeclarationBlock`, `RuleSet`, `CSSFunction`, `Value` (#1258)
 - Remove `Rule::getColNo()` (use `getColumnNumber()` instead) (#1287)
 - Passing a string as the first argument to `getAllValues()` is no longer
   supported and will not work;
diff --git a/src/Position/Position.php b/src/Position/Position.php
index 12afc5e10..7b75f8eac 100644
--- a/src/Position/Position.php
+++ b/src/Position/Position.php
@@ -31,14 +31,6 @@ public function getLineNumber(): ?int
         return $this->lineNumber;
     }
 
-    /**
-     * @return int<0, max>
-     */
-    public function getLineNo(): int
-    {
-        return $this->getLineNumber() ?? 0;
-    }
-
     /**
      * @return int<0, max>|null
      */
diff --git a/src/Position/Positionable.php b/src/Position/Positionable.php
index c9f829a96..d23d26a32 100644
--- a/src/Position/Positionable.php
+++ b/src/Position/Positionable.php
@@ -16,13 +16,6 @@ interface Positionable
      */
     public function getLineNumber(): ?int;
 
-    /**
-     * @return int<0, max>
-     *
-     * @deprecated in version 8.9.0, will be removed in v9.0. Use `getLineNumber()` instead.
-     */
-    public function getLineNo(): int;
-
     /**
      * @return int<0, max>|null
      */
diff --git a/tests/Unit/CSSList/AtRuleBlockListTest.php b/tests/Unit/CSSList/AtRuleBlockListTest.php
index 9c777bedd..3b61e437e 100644
--- a/tests/Unit/CSSList/AtRuleBlockListTest.php
+++ b/tests/Unit/CSSList/AtRuleBlockListTest.php
@@ -114,18 +114,6 @@ public function atRuleArgsReturnsArgumentsProvidedToConstructor(): void
         self::assertSame($arguments, $subject->atRuleArgs());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 42;
-
-        $subject = new AtRuleBlockList('', '', $lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/CSSList/CSSListTest.php b/tests/Unit/CSSList/CSSListTest.php
index ef30c9a30..ce20caafb 100644
--- a/tests/Unit/CSSList/CSSListTest.php
+++ b/tests/Unit/CSSList/CSSListTest.php
@@ -57,28 +57,6 @@ public function implementsCSSListItem(): void
         self::assertInstanceOf(CSSListItem::class, $subject);
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $subject = new ConcreteCSSList();
-
-        self::assertSame(0, $subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 42;
-
-        $subject = new ConcreteCSSList($lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/CSSList/KeyFrameTest.php b/tests/Unit/CSSList/KeyFrameTest.php
index 15c927952..e191a440e 100644
--- a/tests/Unit/CSSList/KeyFrameTest.php
+++ b/tests/Unit/CSSList/KeyFrameTest.php
@@ -68,18 +68,6 @@ public function isCSSList(): void
         self::assertInstanceOf(CSSList::class, $subject);
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 42;
-
-        $subject = new KeyFrame($lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Comment/CommentTest.php b/tests/Unit/Comment/CommentTest.php
index 0db0349a8..69572e903 100644
--- a/tests/Unit/Comment/CommentTest.php
+++ b/tests/Unit/Comment/CommentTest.php
@@ -57,27 +57,6 @@ public function setCommentSetsComments(): void
         self::assertSame($comment, $subject->getComment());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoOnEmptyInstanceReturnsZero(): void
-    {
-        $subject = new Comment();
-
-        self::assertSame(0, $subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoInitiallyReturnsLineNumberPassedToConstructor(): void
-    {
-        $lineNumber = 42;
-        $subject = new Comment('', $lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Parsing/OutputExceptionTest.php b/tests/Unit/Parsing/OutputExceptionTest.php
index 768982d06..73db4ebd5 100644
--- a/tests/Unit/Parsing/OutputExceptionTest.php
+++ b/tests/Unit/Parsing/OutputExceptionTest.php
@@ -32,27 +32,6 @@ public function getMessageReturnsMessageProvidedToConstructor(): void
         self::assertStringContainsString($message, $exception->getMessage());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $exception = new OutputException('foo');
-
-        self::assertSame(0, $exception->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 17;
-        $exception = new OutputException('foo', $lineNumber);
-
-        self::assertSame($lineNumber, $exception->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Parsing/SourceExceptionTest.php b/tests/Unit/Parsing/SourceExceptionTest.php
index ea35f67d4..6e22bc96f 100644
--- a/tests/Unit/Parsing/SourceExceptionTest.php
+++ b/tests/Unit/Parsing/SourceExceptionTest.php
@@ -23,27 +23,6 @@ public function getMessageReturnsMessageProvidedToConstructor(): void
         self::assertStringContainsString($message, $exception->getMessage());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $exception = new SourceException('foo');
-
-        self::assertSame(0, $exception->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 17;
-        $exception = new SourceException('foo', $lineNumber);
-
-        self::assertSame($lineNumber, $exception->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Parsing/UnexpectedEOFExceptionTest.php b/tests/Unit/Parsing/UnexpectedEOFExceptionTest.php
index 4c9040701..32a649a09 100644
--- a/tests/Unit/Parsing/UnexpectedEOFExceptionTest.php
+++ b/tests/Unit/Parsing/UnexpectedEOFExceptionTest.php
@@ -21,27 +21,6 @@ public function extendsUnexpectedTokenException(): void
         self::assertInstanceOf(UnexpectedTokenException::class, new UnexpectedEOFException('expected', 'found'));
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $exception = new UnexpectedEOFException('expected', 'found');
-
-        self::assertSame(0, $exception->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 17;
-        $exception = new UnexpectedEOFException('expected', 'found', 'literal', $lineNumber);
-
-        self::assertSame($lineNumber, $exception->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Parsing/UnexpectedTokenExceptionTest.php b/tests/Unit/Parsing/UnexpectedTokenExceptionTest.php
index 6bd2a8d74..d4fa9eca8 100644
--- a/tests/Unit/Parsing/UnexpectedTokenExceptionTest.php
+++ b/tests/Unit/Parsing/UnexpectedTokenExceptionTest.php
@@ -21,27 +21,6 @@ public function extendsSourceException(): void
         self::assertInstanceOf(SourceException::class, new UnexpectedTokenException('expected', 'found'));
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $exception = new UnexpectedTokenException('expected', 'found');
-
-        self::assertSame(0, $exception->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 17;
-        $exception = new UnexpectedTokenException('expected', 'found', 'literal', $lineNumber);
-
-        self::assertSame($lineNumber, $exception->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Value/CSSStringTest.php b/tests/Unit/Value/CSSStringTest.php
index ca0bf95a4..c54ecdd75 100644
--- a/tests/Unit/Value/CSSStringTest.php
+++ b/tests/Unit/Value/CSSStringTest.php
@@ -60,28 +60,6 @@ public function setStringSetsString(): void
         self::assertSame($string, $subject->getString());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $subject = new CSSString('');
-
-        self::assertSame(0, $subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 42;
-
-        $subject = new CSSString('', $lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Value/CalcRuleValueListTest.php b/tests/Unit/Value/CalcRuleValueListTest.php
index f891d0f53..7314e3c51 100644
--- a/tests/Unit/Value/CalcRuleValueListTest.php
+++ b/tests/Unit/Value/CalcRuleValueListTest.php
@@ -26,28 +26,6 @@ public function isRuleValueList(): void
         self::assertInstanceOf(RuleValueList::class, $subject);
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $subject = new CalcRuleValueList();
-
-        self::assertSame(0, $subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 42;
-
-        $subject = new CalcRuleValueList($lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/Unit/Value/URLTest.php b/tests/Unit/Value/URLTest.php
index cb29ee548..66654e647 100644
--- a/tests/Unit/Value/URLTest.php
+++ b/tests/Unit/Value/URLTest.php
@@ -60,28 +60,6 @@ public function setUrlReplacesUrl(): void
         self::assertSame($newUrl, $subject->getURL());
     }
 
-    /**
-     * @test
-     */
-    public function getLineNoByDefaultReturnsZero(): void
-    {
-        $subject = new URL(new CSSString('http://example.com'));
-
-        self::assertSame(0, $subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
-    {
-        $lineNumber = 17;
-
-        $subject = new URL(new CSSString('http://example.com'), $lineNumber);
-
-        self::assertSame($lineNumber, $subject->getLineNo());
-    }
-
     /**
      * @test
      */
diff --git a/tests/UnitDeprecated/.gitkeep b/tests/UnitDeprecated/.gitkeep
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/UnitDeprecated/Position/PositionTest.php b/tests/UnitDeprecated/Position/PositionTest.php
deleted file mode 100644
index ec34c1f1f..000000000
--- a/tests/UnitDeprecated/Position/PositionTest.php
+++ /dev/null
@@ -1,91 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Sabberworm\CSS\Tests\UnitDeprecated\Position;
-
-use PHPUnit\Framework\TestCase;
-use Sabberworm\CSS\Tests\Unit\Position\Fixtures\ConcretePosition;
-
-/**
- * @covers \Sabberworm\CSS\Position\Position
- */
-final class PositionTest extends TestCase
-{
-    /**
-     * @var ConcretePosition
-     */
-    private $subject;
-
-    protected function setUp(): void
-    {
-        $this->subject = new ConcretePosition();
-    }
-
-    /**
-     * @return array<non-empty-string, array{0: int<1, max>}>
-     */
-    public function provideLineNumber(): array
-    {
-        return [
-            'line 1' => [1],
-            'line 42' => [42],
-        ];
-    }
-
-    /**
-     * @return array<non-empty-string, array{0: int<0, max>}>
-     */
-    public function provideColumnNumber(): array
-    {
-        return [
-            'column 0' => [0],
-            'column 14' => [14],
-            'column 39' => [39],
-        ];
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoInitiallyReturnsZero(): void
-    {
-        self::assertSame(0, $this->subject->getLineNo());
-    }
-
-    /**
-     * @test
-     *
-     * @dataProvider provideLineNumber
-     */
-    public function getLineNoReturnsLineNumberSet(int $lineNumber): void
-    {
-        $this->subject->setPosition($lineNumber);
-
-        self::assertSame($lineNumber, $this->subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoReturnsZeroAfterLineNumberCleared(): void
-    {
-        $this->subject->setPosition(99);
-
-        $this->subject->setPosition(null);
-
-        self::assertSame(0, $this->subject->getLineNo());
-    }
-
-    /**
-     * @test
-     */
-    public function getLineNoAfterSetPositionWithZeroReturnsZero(): void
-    {
-        $this->subject->setPosition(99);
-
-        $this->subject->setPosition(0);
-
-        self::assertSame(0, $this->subject->getLineNo());
-    }
-}