diff --git a/src/Tag/Gtag.php b/src/Tag/Gtag.php
index 0405a88..8c0480b 100644
--- a/src/Tag/Gtag.php
+++ b/src/Tag/Gtag.php
@@ -13,7 +13,10 @@ public function __construct(string $template, array $parameters = [])
     {
         parent::__construct($template);
 
-        $this->setName('setono_tag_bag_gtag');
+        $this
+            ->setName('setono_tag_bag_gtag')
+            ->setSection(TagInterface::SECTION_HEAD)
+        ;
         $this->parameters = $parameters;
     }
 
diff --git a/src/Tag/GtagConfig.php b/src/Tag/GtagConfig.php
index e429f88..ad02486 100644
--- a/src/Tag/GtagConfig.php
+++ b/src/Tag/GtagConfig.php
@@ -13,7 +13,12 @@ public function __construct(string $target, array $parameters = [])
     {
         parent::__construct('@SetonoTagBagGtag/config', $parameters);
 
-        $this->setName('setono_tag_bag_gtag_config');
+        $this
+            ->setName('setono_tag_bag_gtag_config')
+            ->setPriority(GtagLibrary::PRIORITY - 10)
+            ->setUnique(true)
+        ;
+
         $this->target = $target;
     }
 
diff --git a/src/Tag/GtagEvent.php b/src/Tag/GtagEvent.php
index 7707ad2..50a3686 100644
--- a/src/Tag/GtagEvent.php
+++ b/src/Tag/GtagEvent.php
@@ -15,7 +15,10 @@ public function __construct(string $event, array $parameters = [])
     {
         parent::__construct('@SetonoTagBagGtag/event', $parameters);
 
-        $this->setName('setono_tag_bag_gtag_event');
+        $this
+            ->setName('setono_tag_bag_gtag_event')
+            ->setPriority(GtagLibrary::PRIORITY - 20)
+        ;
         $this->event = $event;
     }
 
diff --git a/src/Tag/GtagLibrary.php b/src/Tag/GtagLibrary.php
index c2b2531..e0c7901 100644
--- a/src/Tag/GtagLibrary.php
+++ b/src/Tag/GtagLibrary.php
@@ -8,6 +8,8 @@ class GtagLibrary extends PhpTemplatesTag
 {
     public const NAME = 'setono_tag_bag_gtag_library';
 
+    public const PRIORITY = 100;
+
     public function __construct(string $id)
     {
         parent::__construct('@SetonoTagBagGtag/library', [
@@ -17,7 +19,7 @@ public function __construct(string $id)
         $this->setName(self::NAME)
             ->setUnique(true)
             ->setSection(TagInterface::SECTION_HEAD)
-            ->setPriority(128)
+            ->setPriority(self::PRIORITY)
         ;
     }
 }
diff --git a/src/Tag/GtagSet.php b/src/Tag/GtagSet.php
index 53a4ee7..070e734 100644
--- a/src/Tag/GtagSet.php
+++ b/src/Tag/GtagSet.php
@@ -10,6 +10,9 @@ public function __construct(array $parameters)
     {
         parent::__construct('@SetonoTagBagGtag/set', $parameters);
 
-        $this->setName('setono_tag_bag_gtag_set');
+        $this
+            ->setName('setono_tag_bag_gtag_set')
+            ->setPriority(GtagLibrary::PRIORITY - 20)
+        ;
     }
 }
diff --git a/tests/Tag/GtagConfigTest.php b/tests/Tag/GtagConfigTest.php
index 3b8a9c3..e60a9ef 100644
--- a/tests/Tag/GtagConfigTest.php
+++ b/tests/Tag/GtagConfigTest.php
@@ -30,8 +30,8 @@ public function it_has_default_values(): void
         $tag = new GtagConfig('target');
 
         $this->assertSame('@SetonoTagBagGtag/config', $tag->getTemplate());
-        $this->assertSame(TagInterface::SECTION_BODY_END, $tag->getSection());
-        $this->assertSame(0, $tag->getPriority());
+        $this->assertSame(TagInterface::SECTION_HEAD, $tag->getSection());
+        $this->assertSame(90, $tag->getPriority());
         $this->assertIsArray($tag->getDependencies());
         $this->assertCount(0, $tag->getDependencies());
         $this->assertIsArray($tag->getContext());
diff --git a/tests/Tag/GtagEventTest.php b/tests/Tag/GtagEventTest.php
index 56af0e5..d96200a 100644
--- a/tests/Tag/GtagEventTest.php
+++ b/tests/Tag/GtagEventTest.php
@@ -44,8 +44,8 @@ public function it_has_default_values(): void
         $tag = new GtagEvent('event');
 
         $this->assertSame('@SetonoTagBagGtag/event', $tag->getTemplate());
-        $this->assertSame(TagInterface::SECTION_BODY_END, $tag->getSection());
-        $this->assertSame(0, $tag->getPriority());
+        $this->assertSame(TagInterface::SECTION_HEAD, $tag->getSection());
+        $this->assertSame(80, $tag->getPriority());
         $this->assertIsArray($tag->getDependencies());
         $this->assertCount(0, $tag->getDependencies());
         $this->assertIsArray($tag->getContext());
diff --git a/tests/Tag/GtagLibraryTest.php b/tests/Tag/GtagLibraryTest.php
index 4a73b48..bdb7fed 100644
--- a/tests/Tag/GtagLibraryTest.php
+++ b/tests/Tag/GtagLibraryTest.php
@@ -32,7 +32,7 @@ public function it_has_default_values(): void
 
         $this->assertSame('@SetonoTagBagGtag/library', $tag->getTemplate());
         $this->assertSame(TagInterface::SECTION_HEAD, $tag->getSection());
-        $this->assertSame(128, $tag->getPriority());
+        $this->assertSame(100, $tag->getPriority());
     }
 
     /**
diff --git a/tests/Tag/GtagSetTest.php b/tests/Tag/GtagSetTest.php
index 828503c..7d95356 100644
--- a/tests/Tag/GtagSetTest.php
+++ b/tests/Tag/GtagSetTest.php
@@ -29,8 +29,8 @@ public function it_has_default_values(): void
         $tag = new GtagSet(['param1' => 'value1']);
 
         $this->assertSame('@SetonoTagBagGtag/set', $tag->getTemplate());
-        $this->assertSame(TagInterface::SECTION_BODY_END, $tag->getSection());
-        $this->assertSame(0, $tag->getPriority());
+        $this->assertSame(TagInterface::SECTION_HEAD, $tag->getSection());
+        $this->assertSame(80, $tag->getPriority());
         $this->assertIsArray($tag->getDependencies());
         $this->assertCount(0, $tag->getDependencies());
         $this->assertIsArray($tag->getContext());