diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7df0721..c92fc1c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php: [ '8.1', '8.2', '8.3', '8.4' ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         stability: [ prefer-lowest, prefer-stable ]
     steps:
diff --git a/composer.json b/composer.json
index f2f80b3..48afd84 100644
--- a/composer.json
+++ b/composer.json
@@ -17,8 +17,8 @@
     ],
     "require": {
         "php": "^8.1",
-        "phplrt/position-contracts": "^4.0",
-        "phplrt/source-contracts": "^4.0",
+        "phplrt/position-contracts": "^3.7",
+        "phplrt/source-contracts": "^3.7",
         "symfony/deprecation-contracts": "^2.5|^3.0"
     },
     "autoload": {
@@ -27,7 +27,7 @@
         }
     },
     "require-dev": {
-        "phplrt/source": "^4.0",
+        "phplrt/source": "^3.7",
         "phpunit/phpunit": "^10.5|^11.0",
         "phpstan/extension-installer": "^1.4",
         "phpstan/phpstan": "^1.11",
@@ -39,12 +39,12 @@
         }
     },
     "provide": {
-        "phplrt/position-contracts-implementation": "^4.0"
+        "phplrt/position-contracts-implementation": "^3.7"
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "4.x-dev",
-            "dev-main": "4.x-dev"
+            "dev-master": "3.x-dev",
+            "dev-main": "3.x-dev"
         }
     },
     "config": {
diff --git a/src/Interval.php b/src/Interval.php
new file mode 100644
index 0000000..c87d374
--- /dev/null
+++ b/src/Interval.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phplrt\Position;
+
+use Phplrt\Contracts\Position\IntervalInterface;
+use Phplrt\Contracts\Position\PositionInterface;
+
+/**
+ * @deprecated since phplrt 3.4 and will be removed in 4.0.
+ */
+final class Interval implements IntervalInterface
+{
+    use IntervalFactoryTrait;
+
+    private PositionInterface $from;
+
+    private PositionInterface $to;
+
+    public function __construct(PositionInterface $from, PositionInterface $to)
+    {
+        trigger_deprecation('phplrt/position', '3.4', <<<'MSG'
+            Using "%s::class" is deprecated.
+            MSG, self::class);
+
+        $this->from = $from;
+        $this->to = $to;
+    }
+
+    public function getFrom(): PositionInterface
+    {
+        return $this->from;
+    }
+
+    public function getTo(): PositionInterface
+    {
+        return $this->to;
+    }
+
+    public function getLength(): int
+    {
+        return \max(0, \abs($this->to->getOffset() - $this->from->getOffset()));
+    }
+}
diff --git a/src/IntervalFactoryTrait.php b/src/IntervalFactoryTrait.php
new file mode 100644
index 0000000..15c0163
--- /dev/null
+++ b/src/IntervalFactoryTrait.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phplrt\Position;
+
+use Phplrt\Contracts\Position\IntervalInterface;
+use Phplrt\Contracts\Source\SourceExceptionInterface;
+
+/**
+ * @deprecated since phplrt 3.4 and will be removed in 4.0.
+ */
+trait IntervalFactoryTrait
+{
+    /**
+     * @param int<0, max> $offset
+     * @param int<0, max> $length
+     *
+     * @throws SourceExceptionInterface
+     */
+    public static function fromOffset($source, int $offset = 0, int $length = 0): IntervalInterface
+    {
+        return new Interval(
+            Position::fromOffset($source, $offset),
+            Position::fromOffset($source, $offset + $length)
+        );
+    }
+
+    /**
+     * @param int<1, max> $line
+     * @param int<1, max> $column
+     * @param int<0, max> $length
+     *
+     * @throws SourceExceptionInterface
+     */
+    public static function fromPosition($source, int $line = 1, int $column = 1, int $length = 0): IntervalInterface
+    {
+        return new Interval(
+            $from = Position::fromPosition($source, $line, $column),
+            Position::fromOffset($source, $from->getOffset() + $length)
+        );
+    }
+}
diff --git a/src/PositionFactoryTrait.php b/src/PositionFactoryTrait.php
index a305d8b..5b146dc 100644
--- a/src/PositionFactoryTrait.php
+++ b/src/PositionFactoryTrait.php
@@ -98,7 +98,7 @@ public static function start(): PositionInterface
      * @throws SourceExceptionInterface in case of an error in creating the
      *         source object
      */
-    public static function end(mixed $source): PositionInterface
+    public static function end($source): PositionInterface
     {
         $factory = self::getPositionFactory();
 
diff --git a/src/PositionInterface.php b/src/PositionInterface.php
new file mode 100644
index 0000000..0adaf54
--- /dev/null
+++ b/src/PositionInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phplrt\Position;
+
+use Phplrt\Contracts\Position\PositionInterface as PositionContract;
+
+/**
+ * @deprecated since phplrt 3.2 and will be removed in 4.0, use {@see PositionContract} instead.
+ */
+interface PositionInterface extends PositionContract {}
diff --git a/tests/Unit/LinesTest.php b/tests/Unit/LinesTest.php
index 26881c0..46cfcf0 100644
--- a/tests/Unit/LinesTest.php
+++ b/tests/Unit/LinesTest.php
@@ -18,7 +18,7 @@ public function testOffsetOverflow(string $text, int $lines): void
     }
 
     #[DataProvider('provider')]
-    public function testOffsetUnderflow(string $text): void
+    public function testOffsetUnderflow(string $text, int $lines): void
     {
         $position = Position::fromOffset($text, \PHP_INT_MIN);