diff --git a/docs_src/app_testing/app_b/main.py b/docs_src/app_testing/app_b/main.py
index 45a103378..4fd44dfd1 100644
--- a/docs_src/app_testing/app_b/main.py
+++ b/docs_src/app_testing/app_b/main.py
@@ -34,5 +34,5 @@ async def create_item(item: Item, x_token: str = Header()):
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
         raise HTTPException(status_code=409, detail="Item already exists")
-    fake_db[item.id] = item
+    fake_db[item.id] = item.model_dump()
     return item
diff --git a/docs_src/app_testing/app_b_an/main.py b/docs_src/app_testing/app_b_an/main.py
index c63134fc9..5d1acbb19 100644
--- a/docs_src/app_testing/app_b_an/main.py
+++ b/docs_src/app_testing/app_b_an/main.py
@@ -35,5 +35,5 @@ async def create_item(item: Item, x_token: Annotated[str, Header()]):
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
         raise HTTPException(status_code=400, detail="Item already exists")
-    fake_db[item.id] = item
+    fake_db[item.id] = item.model_dump()
     return item
diff --git a/docs_src/app_testing/app_b_an_py310/main.py b/docs_src/app_testing/app_b_an_py310/main.py
index 48c27a0b8..3b982d7c4 100644
--- a/docs_src/app_testing/app_b_an_py310/main.py
+++ b/docs_src/app_testing/app_b_an_py310/main.py
@@ -34,5 +34,5 @@ async def create_item(item: Item, x_token: Annotated[str, Header()]):
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
         raise HTTPException(status_code=400, detail="Item already exists")
-    fake_db[item.id] = item
+    fake_db[item.id] = item.model_dump()
     return item
diff --git a/docs_src/app_testing/app_b_an_py39/main.py b/docs_src/app_testing/app_b_an_py39/main.py
index 935a510b7..f92767535 100644
--- a/docs_src/app_testing/app_b_an_py39/main.py
+++ b/docs_src/app_testing/app_b_an_py39/main.py
@@ -34,5 +34,5 @@ async def create_item(item: Item, x_token: Annotated[str, Header()]):
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
         raise HTTPException(status_code=400, detail="Item already exists")
-    fake_db[item.id] = item
+    fake_db[item.id] = item.model_dump()
     return item
diff --git a/docs_src/app_testing/app_b_py310/main.py b/docs_src/app_testing/app_b_py310/main.py
index eccedcc7c..955acfbae 100644
--- a/docs_src/app_testing/app_b_py310/main.py
+++ b/docs_src/app_testing/app_b_py310/main.py
@@ -32,5 +32,5 @@ async def create_item(item: Item, x_token: str = Header()):
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
         raise HTTPException(status_code=409, detail="Item already exists")
-    fake_db[item.id] = item
+    fake_db[item.id] = item.model_dump()
     return item