diff --git a/lib/DTO/PhpConfiguration.php b/lib/DTO/PhpConfiguration.php
index 3ebe9ee..0ec8c52 100644
--- a/lib/DTO/PhpConfiguration.php
+++ b/lib/DTO/PhpConfiguration.php
@@ -16,4 +16,25 @@ public function __construct(
         public ?array $composerLockContent = null,
     ) {
     }
+
+    /**
+     * This only parses prod dependencies from composer.lock.
+     *
+     * @return array<string, string>
+     */
+    public function getExactInstalledDependencies(): array
+    {
+        if (null === $this->composerLockContent || !isset($this->composerLockContent['packages'])) {
+            return [];
+        }
+
+        $dependencies = [];
+        foreach ($this->composerLockContent['packages'] as $package) {
+            if (isset($package['name'], $package['version'])) {
+                $dependencies[$package['name']] = $package['version'];
+            }
+        }
+
+        return $dependencies;
+    }
 }
diff --git a/tests/Unit/DetectorTest.php b/tests/Unit/DetectorTest.php
index 2cb619d..f2b51c2 100644
--- a/tests/Unit/DetectorTest.php
+++ b/tests/Unit/DetectorTest.php
@@ -451,6 +451,50 @@ public function it_returns_composer_lock_content_if_both_composer_config_files_a
         );
     }
 
+    /** @test */
+    public function it_returns_no_exact_installed_dependencies_if_no_composer_lock_is_found()
+    {
+        $fullConfig = $this->sut->getFullConfiguration(
+            sprintf('%s/../fixtures/%s', __DIR__, 'composer-config/composer-json')
+        );
+
+        $this->assertNotNull($fullConfig);
+        $this->assertNotNull($fullConfig->phpConfiguration);
+        $this->assertIsArray(
+            $fullConfig->phpConfiguration->getExactInstalledDependencies()
+        );
+        $this->assertCount(
+            0,
+            $fullConfig->phpConfiguration->getExactInstalledDependencies()
+        );
+    }
+
+    /** @test */
+    public function it_returns_exact_installed_dependencies_if_composer_lock_is_found()
+    {
+        $fullConfig = $this->sut->getFullConfiguration(
+            sprintf('%s/../fixtures/%s', __DIR__, 'composer-config/composer-both')
+        );
+
+        $this->assertNotNull($fullConfig);
+        $this->assertNotNull($fullConfig->phpConfiguration);
+        $this->assertIsArray(
+            $fullConfig->phpConfiguration->getExactInstalledDependencies()
+        );
+        $this->assertCount(
+            3,
+            $fullConfig->phpConfiguration->getExactInstalledDependencies()
+        );
+        $this->assertSame(
+            [
+                'someframework/foo' => 'v2.4.1',
+                'symfony/config' => 'v6.3.2',
+                'symfony/framework-bundle' => 'v6.3.5',
+            ],
+            $fullConfig->phpConfiguration->getExactInstalledDependencies()
+        );
+    }
+
     public static function packagesDataProvider(): array
     {
         return [