diff --git a/README.md b/README.md
index d69c043..06a0551 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,8 @@ $ source ./env/bin/activate
 $ pip install -r requirements.txt
 ```
 
+**NOTE:** Python 3.12 is not yet supported.
+
 ## Setup
 
 ```
diff --git a/app/models.py b/app/models.py
index 9643af1..841d57e 100644
--- a/app/models.py
+++ b/app/models.py
@@ -127,7 +127,7 @@ async def stats(db, query):
                 ]
             )
 
-        select = sqlalchemy.select(measurements_stats)
+        select = sqlalchemy.select(*measurements_stats)
         select = select.group_by(
             measurements.c.sensor,
             measurements.c.source,
@@ -166,8 +166,9 @@ async def create_new_key(db: Database, provider: str) -> str:
     @staticmethod
     async def get_providers(db: Database) -> List[Tuple[str, int]]:
         query = sqlalchemy.select(
-            [providers.c.provider, sqlalchemy.func.count(providers.c.provider)]
-        ).group_by(providers.c.provider)
+            providers.c.provider, sqlalchemy.func.count(providers.c.provider)
+        )
+        query = query.group_by(providers.c.provider)
         query = query.order_by(sqlalchemy.asc(providers.c.provider))
         return await db.fetch_all(query)
 
@@ -187,14 +188,14 @@ async def revoke_all_keys(db: Database, provider: str) -> bool:
 
     @staticmethod
     async def get_all_keys(db: Database) -> Set[str]:
-        query = sqlalchemy.select([providers.c.api_key_hash])
+        query = sqlalchemy.select(providers.c.api_key_hash)
         query = query.order_by(sqlalchemy.asc(providers.c.provider))
         keys = await db.fetch_all(query)
         return {k[0] for k in keys}
 
     @staticmethod
     async def get_provider_for_key(db: Database, api_key_hash: str) -> Union[str, None]:
-        query = sqlalchemy.select([providers.c.id, providers.c.api_key_hash])
+        query = sqlalchemy.select(providers.c.id, providers.c.api_key_hash)
         query = query.where(providers.c.api_key_hash == api_key_hash)
         provider = await db.fetch_one(query)
         return provider[0] if provider else None
diff --git a/app/reports.py b/app/reports.py
index 93d551e..7613740 100644
--- a/app/reports.py
+++ b/app/reports.py
@@ -71,9 +71,11 @@ def get_quality(source):
         breakpoint_index = CONCENTRATIONS.index(concentration)
         breakpoint = BREAKPOINTS[breakpoint_index]
 
-        index = (
-            (breakpoint[1] - breakpoint[0]) / (concentration[1] - concentration[0])
-        ) * (source.pm2dot5_average - concentration[0]) + breakpoint[0]
+        index = int(
+            ((breakpoint[1] - breakpoint[0]) / (concentration[1] - concentration[0]))
+            * (source.pm2dot5_average - concentration[0])
+            + breakpoint[0]
+        )
         index_breakpoint = next(
             (b for b in BREAKPOINTS if index <= b[1]),
             BREAKPOINTS[-1],
diff --git a/app/schemas.py b/app/schemas.py
index 67d4840..24904d0 100644
--- a/app/schemas.py
+++ b/app/schemas.py
@@ -124,37 +124,37 @@ def to_orm(self, provider):
         return _dict
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 @dataclass
 class QueryParams:
-    source: str = Query(
+    source: Optional[str] = Query(
         None,
         title="Source",
         description="Include measurements from this source only",
     )
-    start: datetime = Query(
+    start: Optional[datetime] = Query(
         None,
         title="Start",
         description="Include measurements after this date and time",
     )
-    end: datetime = Query(
+    end: Optional[datetime] = Query(
         None,
         title="End",
         description="Include measurements before this date and time",
     )
-    longitude: float = Query(
+    longitude: Optional[float] = Query(
         None,
         title="Longitude",
         description="Target longitude coordinate",
     )
-    latitude: float = Query(
+    latitude: Optional[float] = Query(
         None,
         title="Latitude",
         description="Target latitude coordinate",
     )
-    distance: float = Query(
+    distance: Optional[float] = Query(
         None,
         title="Distance",
         description="Include measurements that are this kilometers far from the target",
@@ -174,7 +174,7 @@ class Provider(BaseModel):
     )
 
     class Config:
-        orm_mode = True
+        from_attributes = True
 
 
 class APIKey(BaseModel):
@@ -233,7 +233,7 @@ class Report(BaseModel):
         title="Latitude",
         description="Target latitude coordinate",
     )
-    quality: Quality = Field(
+    quality: Optional[Quality] = Field(
         None,
         title="Quality",
         description="Quality according to AQI",
diff --git a/app/service.py b/app/service.py
index 08178fd..ebb4bac 100644
--- a/app/service.py
+++ b/app/service.py
@@ -13,6 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from contextlib import asynccontextmanager
 from fastapi import FastAPI, Depends
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.security.api_key import APIKey
@@ -25,7 +26,14 @@
 from .authentication import validate_api_key, validate_master_key
 
 
-app = FastAPI()
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    await db.connect()
+    yield
+    await db.disconnect()
+
+
+app = FastAPI(lifespan=lifespan)
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["*"],
@@ -35,16 +43,6 @@
 )
 
 
-@app.on_event("startup")
-async def startup():
-    await db.connect()
-
-
-@app.on_event("shutdown")
-async def shutdown():
-    await db.disconnect()
-
-
 @app.post("/api/v1/providers", response_model=schemas.APIKey)
 async def create_provider(
     provider: schemas.Provider, key: APIKey = Depends(validate_master_key)
diff --git a/requirements.txt b/requirements.txt
index 05c1055..0f96929 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-fastapi==0.94.1
+fastapi==0.114.1
 httpx==0.23.3
 uvicorn==0.21.0
 gunicorn==20.1.0
@@ -9,8 +9,9 @@ black==23.1.0
 aiosqlite==0.18.0
 databases==0.7.0
 SQLAlchemy==1.4.46
-asyncpg==0.27.0
-psycopg2-binary==2.9.5
+asyncpg==0.29.0
+psycopg2-binary==2.9.9
 alembic==1.10.2
 geopy==2.3.0
-pytest-dependency==0.5.1
\ No newline at end of file
+pytest-dependency==0.5.1
+pydantic==2.9.1
diff --git a/tests/service.py b/tests/service.py
index 845298c..86b3886 100644
--- a/tests/service.py
+++ b/tests/service.py
@@ -43,7 +43,7 @@
         "co2": 1000.0,
         "longitude": -57.521369,
         "latitude": -25.194156,
-        "recorded": "2020-10-24T20:47:57.370721+00:00",
+        "recorded": "2020-10-24T20:47:57.370721Z",
     },
     {
         "sensor": "nullable",
@@ -59,7 +59,7 @@
         "co2": None,
         "longitude": -57.521369,
         "latitude": -25.194156,
-        "recorded": "2020-10-24T20:47:57.370721+00:00",
+        "recorded": "2020-10-24T20:47:57.370721Z",
     },
     {
         "sensor": "test",
@@ -75,7 +75,7 @@
         "co2": 200.0,
         "longitude": -57.521369,
         "latitude": -25.194156,
-        "recorded": "2020-10-24T20:47:57.370721+00:00",
+        "recorded": "2020-10-24T20:47:57.370721Z",
     },
 ]
 aqi = [