diff --git a/CHANGELOG.md b/CHANGELOG.md
index 980a9b7..9e2e796 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - Removed the example of an old json submission (before 2022-11-21) 
 - Updated actions using the latest base images and to run using Python 3.9
 - Docker image uses Python 3.11 instead of 3.8
+- Replaced deprecated app "on event" with app lifespan
 ### Fixed
 - Updated issue templates
 - Updated a number of libraries to address all current security advisories
diff --git a/preClinVar/main.py b/preClinVar/main.py
index da7421c..beb0e88 100644
--- a/preClinVar/main.py
+++ b/preClinVar/main.py
@@ -1,6 +1,7 @@
 import json
 import logging
 import re
+from contextlib import asynccontextmanager
 from typing import List
 
 import requests
@@ -16,16 +17,18 @@
 
 LOG = logging.getLogger("uvicorn.access")
 
-app = FastAPI()
 
-
-@app.on_event("startup")
-async def startup_event():
+@asynccontextmanager
+async def lifespan(app_: FastAPI):
     LOG = logging.getLogger("uvicorn.access")
     console_formatter = uvicorn.logging.ColourizedFormatter(
         "{levelprefix} {asctime} : {message}", style="{", use_colors=True
     )
     LOG.handlers[0].setFormatter(console_formatter)
+    yield
+
+
+app = FastAPI(lifespan=lifespan)
 
 
 @app.get("/")