diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 2a172a0..8b04e81 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -34,6 +34,9 @@
         'error_suppression' => true,
         'ereg_to_preg' => true,
         'dir_constant' => true,
+        'string_implicit_backslashes' => [
+            'single_quoted' => 'ignore',
+        ],
     ])
     ->setFinder($finder)
     ->setCacheFile('.php-cs-fixer.cache') // forward compatibility with 3.x line
diff --git a/src/Dockerfile.php b/src/Dockerfile.php
index 6308ad4..59f85f8 100644
--- a/src/Dockerfile.php
+++ b/src/Dockerfile.php
@@ -12,7 +12,7 @@ final class Dockerfile implements \IteratorAggregate, \Countable, FileInterface,
     /** @var iterable|Dockerfile\LayerInterface[] */
     private iterable $layers;
 
-    public function __construct(null|LayerInterface ...$layers)
+    public function __construct(?LayerInterface ...$layers)
     {
         $this->layers = $layers;
     }
diff --git a/src/PHP/ComposerAuthenticationToken.php b/src/PHP/ComposerAuthenticationToken.php
index 76a3df4..f5045fd 100644
--- a/src/PHP/ComposerAuthenticationToken.php
+++ b/src/PHP/ComposerAuthenticationToken.php
@@ -6,6 +6,7 @@
 
 use Kiboko\Component\Dockerfile\Dockerfile;
 
+/** @deprecated */
 final readonly class ComposerAuthenticationToken implements Dockerfile\LayerInterface, \Stringable
 {
     public function __construct(
diff --git a/src/PHP/ComposerGithubOauthAuthentication.php b/src/PHP/ComposerGithubOauthAuthentication.php
new file mode 100644
index 0000000..1c34ce2
--- /dev/null
+++ b/src/PHP/ComposerGithubOauthAuthentication.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Dockerfile\PHP;
+
+use Kiboko\Component\Dockerfile\Dockerfile;
+
+final readonly class ComposerGithubOauthAuthentication implements Dockerfile\LayerInterface, \Stringable
+{
+    public function __construct(
+        private string $token,
+        private string $domain = 'github.com',
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return (string) new Dockerfile\Run(sprintf(<<<'RUN'
+            set -ex \
+                && composer config --auth github-oauth.%s %s
+            RUN, $this->domain, $this->token));
+    }
+}
diff --git a/src/PHP/ComposerGitlabOauthAuthentication.php b/src/PHP/ComposerGitlabOauthAuthentication.php
new file mode 100644
index 0000000..03cdb61
--- /dev/null
+++ b/src/PHP/ComposerGitlabOauthAuthentication.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Dockerfile\PHP;
+
+use Kiboko\Component\Dockerfile\Dockerfile;
+
+final readonly class ComposerGitlabOauthAuthentication implements Dockerfile\LayerInterface, \Stringable
+{
+    public function __construct(
+        private string $token,
+        private string $domain = 'gitlab.com',
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return (string) new Dockerfile\Run(sprintf(<<<'RUN'
+            set -ex \
+                && composer config --auth gitlab-oauth.%s %s
+            RUN, $this->domain, $this->token));
+    }
+}
diff --git a/src/PHP/ComposerGitlabTokenAuthentication.php b/src/PHP/ComposerGitlabTokenAuthentication.php
new file mode 100644
index 0000000..bd8414e
--- /dev/null
+++ b/src/PHP/ComposerGitlabTokenAuthentication.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Dockerfile\PHP;
+
+use Kiboko\Component\Dockerfile\Dockerfile;
+
+final readonly class ComposerGitlabTokenAuthentication implements Dockerfile\LayerInterface, \Stringable
+{
+    public function __construct(
+        private string $token,
+        private string $domain = 'gitlab.com',
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return (string) new Dockerfile\Run(sprintf(<<<'RUN'
+            set -ex \
+                && composer config --auth gitlab-token.%s %s
+            RUN, $this->domain, $this->token));
+    }
+}
diff --git a/src/PHP/ComposerHttpBasicAuthentication.php b/src/PHP/ComposerHttpBasicAuthentication.php
new file mode 100644
index 0000000..b670442
--- /dev/null
+++ b/src/PHP/ComposerHttpBasicAuthentication.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Dockerfile\PHP;
+
+use Kiboko\Component\Dockerfile\Dockerfile;
+
+final readonly class ComposerHttpBasicAuthentication implements Dockerfile\LayerInterface, \Stringable
+{
+    public function __construct(
+        private string $domain,
+        private string $username,
+        private string $password,
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return (string) new Dockerfile\Run(sprintf(<<<'RUN'
+            set -ex \
+                && composer config --auth http-basic.%s %s %s
+            RUN, $this->domain, $this->username, $this->password));
+    }
+}
diff --git a/src/PHP/ComposerHttpBearerAuthentication.php b/src/PHP/ComposerHttpBearerAuthentication.php
new file mode 100644
index 0000000..dd4f74d
--- /dev/null
+++ b/src/PHP/ComposerHttpBearerAuthentication.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Dockerfile\PHP;
+
+use Kiboko\Component\Dockerfile\Dockerfile;
+
+final readonly class ComposerHttpBearerAuthentication implements Dockerfile\LayerInterface, \Stringable
+{
+    public function __construct(
+        private string $domain,
+        private string $token,
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return (string) new Dockerfile\Run(sprintf(<<<'RUN'
+            set -ex \
+                && composer config --auth bearer.%s %s
+            RUN, $this->domain, $this->token));
+    }
+}