diff --git a/core/includes/install.inc b/core/includes/install.inc
index e6db8eb8f0..60e665516d 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -1129,25 +1129,15 @@ function install_profile_info($profile, $langcode = 'en') {
       'config_install_path' => NULL,
     ];
     $profile_path = drupal_get_path('profile', $profile);
-    $info_path = "$profile_path/$profile.info.yml";
-    $info_parser = \Drupal::service('info_parser');
-    if (file_exists($info_path)) {
-      // Favour the legacy .info.yml file.
-      $info = $info_parser->parse($info_path);
-    }
-    else {
-      $info = $info_parser->parse("$profile_path/composer.json");
-    }
+    $info = \Drupal::service('info_parser')->parse("$profile_path/$profile.info.yml");
+
     $info += $defaults;
 
-    // Modern composer.json file.
     $dependency_name_function = function ($dependency) {
       return Dependency::createFromString($dependency)->getName();
     };
-    if (!empty($info['require'])) {
-      // Remove the entry for core, it is not a module.
-      unset($info['require']['core']);
-      $info['dependencies'] = array_keys($info['require']);
+    if (!empty($info['composer_dependencies'])) {
+      $info['dependencies'] = array_keys($info['composer_dependencies']);
     }
     else {
       // Convert dependencies in [project:module] format.
diff --git a/core/lib/Drupal/Core/Extension/Dependency.php b/core/lib/Drupal/Core/Extension/Dependency.php
index c68b9e938c..54dab149aa 100644
--- a/core/lib/Drupal/Core/Extension/Dependency.php
+++ b/core/lib/Drupal/Core/Extension/Dependency.php
@@ -97,8 +97,8 @@ protected function getConstraint() {
   /**
    * {@inheritdoc}
    */
-  public function isCompatible($version) {
-    return $this->getConstraint()->isCompatible($version);
+  public function isCompatible($dependee_version) {
+    return $this->getConstraint()->isCompatible($dependee_version);
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Extension/Dependency/Composer.php b/core/lib/Drupal/Core/Extension/Dependency/Composer.php
index 054d2f3bfc..ff542d542f 100644
--- a/core/lib/Drupal/Core/Extension/Dependency/Composer.php
+++ b/core/lib/Drupal/Core/Extension/Dependency/Composer.php
@@ -45,8 +45,8 @@ public function getName() {
   /**
    * {@inheritdoc}
    */
-  public function isCompatible($version) {
-    return Semver::satisfies($version, $this->constraint);
+  public function isCompatible($dependee_version) {
+    return Semver::satisfies($dependee_version, $this->constraint);
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Extension/Dependency/DependencyInterface.php b/core/lib/Drupal/Core/Extension/Dependency/DependencyInterface.php
index 0686906c96..e9142e3694 100644
--- a/core/lib/Drupal/Core/Extension/Dependency/DependencyInterface.php
+++ b/core/lib/Drupal/Core/Extension/Dependency/DependencyInterface.php
@@ -10,13 +10,13 @@ interface DependencyInterface {
   /**
    * Determines if the provided version is compatible with this dependency.
    *
-   * @param string $version
-   *   The version to check, for example '4.2'.
+   * @param string $dependee_version
+   *   The dependee version to check, for example '4.2'.
    *
    * @return bool
    *   TRUE if compatible with the provided version, FALSE if not.
    */
-  public function isCompatible($version);
+  public function isCompatible($dependee_version);
 
   /**
    * Gets dependency name.
diff --git a/core/lib/Drupal/Core/Extension/Discovery/RecursiveExtensionFilterIterator.php b/core/lib/Drupal/Core/Extension/Discovery/RecursiveExtensionFilterIterator.php
index 6d95d6378b..deba59bf11 100644
--- a/core/lib/Drupal/Core/Extension/Discovery/RecursiveExtensionFilterIterator.php
+++ b/core/lib/Drupal/Core/Extension/Discovery/RecursiveExtensionFilterIterator.php
@@ -158,8 +158,8 @@ public function accept() {
       return !in_array($name, $this->blacklist, TRUE);
     }
     else {
-      // Only accept extension info or composer.json files.
-      return $name === 'composer.json'|| substr($name, -9) == '.info.yml';
+      // Only accept extension info files.
+      return substr($name, -9) == '.info.yml';
     }
   }