diff --git a/README.md b/README.md
index ffb61ef..6707565 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ composer require gemorroj/m3u-parser
 
 ```php
 <?php
+declare(strict_types=1);
+
 use M3uParser\M3uParser;
 
 $m3uParser = new M3uParser();
@@ -131,6 +133,8 @@ foreach ($data as $entry) {
 
 ```php
 <?php
+declare(strict_types=1);
+
 use M3uParser\M3uData;
 use M3uParser\M3uEntry;
 use M3uParser\Tag\ExtInf;
diff --git a/src/Exception.php b/src/Exception.php
index d097ead..51d33a2 100644
--- a/src/Exception.php
+++ b/src/Exception.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 class Exception extends \Exception
diff --git a/src/M3uData.php b/src/M3uData.php
index b50b392..43f408a 100644
--- a/src/M3uData.php
+++ b/src/M3uData.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 /** @extends \ArrayIterator<int, M3uEntry> */
diff --git a/src/M3uEntry.php b/src/M3uEntry.php
index f87c105..4d4e6fb 100644
--- a/src/M3uEntry.php
+++ b/src/M3uEntry.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 use M3uParser\Tag\ExtTagInterface;
diff --git a/src/M3uParser.php b/src/M3uParser.php
index 9ae370c..f90ff95 100644
--- a/src/M3uParser.php
+++ b/src/M3uParser.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 class M3uParser
diff --git a/src/Tag/ExtAlbumArtUrl.php b/src/Tag/ExtAlbumArtUrl.php
index b910e83..9543dfa 100644
--- a/src/Tag/ExtAlbumArtUrl.php
+++ b/src/Tag/ExtAlbumArtUrl.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/ExtGrp.php b/src/Tag/ExtGrp.php
index ab209f1..e1592f9 100644
--- a/src/Tag/ExtGrp.php
+++ b/src/Tag/ExtGrp.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/ExtInf.php b/src/Tag/ExtInf.php
index a552cfe..dc98551 100644
--- a/src/Tag/ExtInf.php
+++ b/src/Tag/ExtInf.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 use M3uParser\TagAttributesTrait;
@@ -40,9 +42,9 @@ public function getTitle(): string
         return $this->title;
     }
 
-    public function setDuration(float $duration): self
+    public function setDuration(float|int $duration): self
     {
-        $this->duration = $duration;
+        $this->duration = (float) $duration;
 
         return $this;
     }
diff --git a/src/Tag/ExtLogo.php b/src/Tag/ExtLogo.php
index 3698c9d..e6da3d6 100644
--- a/src/Tag/ExtLogo.php
+++ b/src/Tag/ExtLogo.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/ExtTagInterface.php b/src/Tag/ExtTagInterface.php
index b0e9609..60ea717 100644
--- a/src/Tag/ExtTagInterface.php
+++ b/src/Tag/ExtTagInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 interface ExtTagInterface extends \Stringable
diff --git a/src/Tag/ExtTitle.php b/src/Tag/ExtTitle.php
index 2acd56d..b19051a 100644
--- a/src/Tag/ExtTitle.php
+++ b/src/Tag/ExtTitle.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/ExtTv.php b/src/Tag/ExtTv.php
index 97f52ab..4e5abb4 100644
--- a/src/Tag/ExtTv.php
+++ b/src/Tag/ExtTv.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/ExtVlcOpt.php b/src/Tag/ExtVlcOpt.php
index 46c855b..64e2d0f 100644
--- a/src/Tag/ExtVlcOpt.php
+++ b/src/Tag/ExtVlcOpt.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/Tag/Playlist.php b/src/Tag/Playlist.php
index 34577c7..386a32d 100644
--- a/src/Tag/Playlist.php
+++ b/src/Tag/Playlist.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tag;
 
 /**
diff --git a/src/TagAttributesTrait.php b/src/TagAttributesTrait.php
index b53b2a1..b35d766 100644
--- a/src/TagAttributesTrait.php
+++ b/src/TagAttributesTrait.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 /**
diff --git a/src/TagsManagerTrait.php b/src/TagsManagerTrait.php
index 8a89811..92cb9f3 100644
--- a/src/TagsManagerTrait.php
+++ b/src/TagsManagerTrait.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser;
 
 use M3uParser\Tag\ExtAlbumArtUrl;
diff --git a/tests/ExceptionTest.php b/tests/ExceptionTest.php
index 2888aeb..424c173 100644
--- a/tests/ExceptionTest.php
+++ b/tests/ExceptionTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\Exception;
diff --git a/tests/ExtCustomTag.php b/tests/ExtCustomTag.php
index 0317a20..d5cfbf1 100644
--- a/tests/ExtCustomTag.php
+++ b/tests/ExtCustomTag.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\Tag\ExtTagInterface;
diff --git a/tests/M3uDataTest.php b/tests/M3uDataTest.php
index 2a9724f..db808c7 100644
--- a/tests/M3uDataTest.php
+++ b/tests/M3uDataTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\M3uData;
diff --git a/tests/M3uParserTest.php b/tests/M3uParserTest.php
index e9e7fd2..8c3f105 100644
--- a/tests/M3uParserTest.php
+++ b/tests/M3uParserTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\Exception as M3uParserException;
diff --git a/tests/Tag/ExtAlbumArtUrlTest.php b/tests/Tag/ExtAlbumArtUrlTest.php
index 27ad745..c1b1ea9 100644
--- a/tests/Tag/ExtAlbumArtUrlTest.php
+++ b/tests/Tag/ExtAlbumArtUrlTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtGrpTest.php b/tests/Tag/ExtGrpTest.php
index d58c19b..9aadda3 100644
--- a/tests/Tag/ExtGrpTest.php
+++ b/tests/Tag/ExtGrpTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtInfTest.php b/tests/Tag/ExtInfTest.php
index 390cd46..dbc77b6 100644
--- a/tests/Tag/ExtInfTest.php
+++ b/tests/Tag/ExtInfTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtLogoTest.php b/tests/Tag/ExtLogoTest.php
index bf227f7..0a9b0c4 100644
--- a/tests/Tag/ExtLogoTest.php
+++ b/tests/Tag/ExtLogoTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtTitleTest.php b/tests/Tag/ExtTitleTest.php
index fa68505..30b9439 100644
--- a/tests/Tag/ExtTitleTest.php
+++ b/tests/Tag/ExtTitleTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtTvTest.php b/tests/Tag/ExtTvTest.php
index a885c52..6297666 100644
--- a/tests/Tag/ExtTvTest.php
+++ b/tests/Tag/ExtTvTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/ExtVlcOptTest.php b/tests/Tag/ExtVlcOptTest.php
index 5ff827a..e2265f9 100644
--- a/tests/Tag/ExtVlcOptTest.php
+++ b/tests/Tag/ExtVlcOptTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/Tag/PlaylistTest.php b/tests/Tag/PlaylistTest.php
index ff493e3..78829c7 100644
--- a/tests/Tag/PlaylistTest.php
+++ b/tests/Tag/PlaylistTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests\Tag;
 
 use M3uParser\M3uData;
diff --git a/tests/TagAttributesTraitTest.php b/tests/TagAttributesTraitTest.php
index d7c7d34..16a6049 100644
--- a/tests/TagAttributesTraitTest.php
+++ b/tests/TagAttributesTraitTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\TagAttributesTrait;
diff --git a/tests/TagsManagerTraitTest.php b/tests/TagsManagerTraitTest.php
index ad8ee59..cb291ce 100644
--- a/tests/TagsManagerTraitTest.php
+++ b/tests/TagsManagerTraitTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M3uParser\Tests;
 
 use M3uParser\Exception;