diff --git a/examples/petstore-access-control/controllers.py b/examples/petstore-access-control/controllers.py
index b39b101..cfc6a3f 100644
--- a/examples/petstore-access-control/controllers.py
+++ b/examples/petstore-access-control/controllers.py
@@ -37,7 +37,7 @@ def addPet(pet):
     )
     counter = 0
     ctr = db_collection.find({}).sort([('$natural', -1)])
-    if not ctr.count() == 0:
+    if not db_collection.count_documents({}) == 0:
         counter = ctr[0].get('id') + 1
     record = {
         "id": counter,
diff --git a/examples/petstore-access-control/docker-compose.yaml b/examples/petstore-access-control/docker-compose.yaml
index f9a58de..cef463b 100644
--- a/examples/petstore-access-control/docker-compose.yaml
+++ b/examples/petstore-access-control/docker-compose.yaml
@@ -26,7 +26,7 @@ services:
       - "80:8080"
 
   mongodb:
-    image: mongo:3.6
+    image: mongo:7.0
     restart: unless-stopped
     volumes:
       - ./data/petstore-access-control/db:/data/db
diff --git a/examples/petstore/controllers.py b/examples/petstore/controllers.py
index 1bbd79f..b8fad83 100644
--- a/examples/petstore/controllers.py
+++ b/examples/petstore/controllers.py
@@ -32,7 +32,7 @@ def addPet(pet):
     )
     counter = 0
     ctr = db_collection.find({}).sort([('$natural', -1)])
-    if not ctr.count() == 0:
+    if not db_collection.count_documents({}) == 0:
         counter = ctr[0].get('id') + 1
     record = {
         "id": counter,
diff --git a/examples/petstore/docker-compose.yaml b/examples/petstore/docker-compose.yaml
index 36bd6a6..cb41b87 100644
--- a/examples/petstore/docker-compose.yaml
+++ b/examples/petstore/docker-compose.yaml
@@ -26,7 +26,7 @@ services:
       - "80:8080"
 
   mongodb:
-    image: mongo:3.6
+    image: mongo:7.0
     restart: unless-stopped
     volumes:
       - ./data/petstore/db:/data/db
diff --git a/requirements.txt b/requirements.txt
index f7427c6..2a549a2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Flask-Cors==4.0.1
 Flask-PyMongo==2.3.0
 pydantic==1.10.13
 PyJWT==2.4.0
-pymongo==3.10.1
+pymongo==4.7.2
 PyYAML==6.0.1
 requests==2.31.0
 swagger-ui-bundle==0.0.6