diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba1b494..9b033b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased](https://git.d3data.de/D3Public/TestingTools/compare/1.0.0.0...rel_1.x)
+- can modify DI container services in runtime
 
 ## [1.0.0.0](https://git.d3data.de/D3Public/TestingTools/releases/tag/1.0.0.0) - 2022-11-11
 ### Added
diff --git a/src/Development/CanAccessRestricted.php b/src/Development/CanAccessRestricted.php
index c879816..42462c8 100644
--- a/src/Development/CanAccessRestricted.php
+++ b/src/Development/CanAccessRestricted.php
@@ -17,6 +17,8 @@ declare(strict_types=1);
 
 namespace D3\TestingTools\Development;
 
+use OxidEsales\EshopCommunity\Internal\Container\ContainerBuilderFactory;
+use OxidEsales\EshopCommunity\Internal\Container\ContainerFactory;
 use PHPUnit\Framework\MockObject\MockObject;
 use ReflectionClass;
 use ReflectionException;
@@ -109,4 +111,40 @@ trait CanAccessRestricted
         $property->setAccessible(true);
         return $property->getValue($object);
     }
+
+    /**
+     * use \OxidEsales\EshopCommunity\Internal\Container\ContainerFactory::resetContainer() to undo these modifications
+     * @param array<string, object> $services
+     * @return void
+     * @throws ReflectionException
+     */
+    public function addServiceMocks(array $services): void
+    {
+        $builder = (new ContainerBuilderFactory())->create()->getContainer();
+
+        array_walk($services, function ($service, $serviceId) use ($builder) {
+            if ($builder->has($serviceId)) {
+                $builder->set($serviceId, $service);
+            }
+        });
+
+        $builder->compile();
+        $container = ContainerFactory::getInstance();
+        $reflection = new ReflectionClass($container);
+        $property = $reflection->getProperty($this->getDIContainerPropertyName($reflection));
+        $property->setValue($container, $builder);
+    }
+
+    protected function getDIContainerPropertyName(ReflectionClass $containerReflection): string
+    {
+        $property = current(array_filter($containerReflection->getProperties(), function (ReflectionProperty $property) {
+            return stristr($property->getName(), 'container');
+        }));
+
+        if (!is_object($property) || !$property instanceof ReflectionProperty) {
+            throw new \RuntimeException("can't find container property");
+        }
+
+        return $property->getName();
+    }
 }