diff --git a/config/packages/framework.yaml b/config/packages/framework.yaml
index 56d25d5df..fa1da9ce3 100644
--- a/config/packages/framework.yaml
+++ b/config/packages/framework.yaml
@@ -36,6 +36,6 @@ framework:
         handler_id: session.handler.native_file
         save_path: '%kernel.project_dir%/var/sessions/%kernel.environment%'
 
-    trusted_hosts: null
+    trusted_hosts: ~
 
     validation: { enable_annotations: true }
diff --git a/config/packages/routing.yaml b/config/packages/routing.yaml
index b3e6a0af2..368bc7f49 100644
--- a/config/packages/routing.yaml
+++ b/config/packages/routing.yaml
@@ -1,3 +1,3 @@
 framework:
     router:
-        strict_requirements: null
+        strict_requirements: ~
diff --git a/config/packages/test/framework.yaml b/config/packages/test/framework.yaml
index 2ad0bdef8..76d7e5e11 100644
--- a/config/packages/test/framework.yaml
+++ b/config/packages/test/framework.yaml
@@ -1,4 +1,4 @@
 framework:
-    test: null
+    test: ~
     session:
         storage_id: session.storage.mock_file