diff --git a/lnbits/app.py b/lnbits/app.py
index feb69ed80..6fceb9364 100644
--- a/lnbits/app.py
+++ b/lnbits/app.py
@@ -518,19 +518,19 @@ def configure_logger() -> None:
 class Formatter:
     def __init__(self):
         self.padding = 0
-        self.minimal_fmt: str = (
+        self.minimal_fmt = (
             "<green>{time:YYYY-MM-DD HH:mm:ss.SS}</green> | <level>{level}</level> | "
             "<level>{message}</level>\n"
         )
         if settings.debug:
-            self.fmt: str = (
+            self.fmt = (
                 "<green>{time:YYYY-MM-DD HH:mm:ss.SS}</green> | "
                 "<level>{level: <4}</level> | "
                 "<cyan>{name}</cyan>:<cyan>{function}</cyan>:<cyan>{line}</cyan> | "
                 "<level>{message}</level>\n"
             )
         else:
-            self.fmt: str = self.minimal_fmt
+            self.fmt = self.minimal_fmt
 
     def format(self, record):
         function = "{function}".format(**record)
diff --git a/lnbits/cache.py b/lnbits/cache.py
index 68ec9808b..41955bdd9 100644
--- a/lnbits/cache.py
+++ b/lnbits/cache.py
@@ -17,7 +17,7 @@ class Cache:
     Small caching utility providing simple get/set interface (very much like redis)
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._values: dict[Any, Cached] = {}
 
     def get(self, key: str, default=None) -> Optional[Any]:
diff --git a/lnbits/core/services.py b/lnbits/core/services.py
index 651c16a29..3b9f1b1dd 100644
--- a/lnbits/core/services.py
+++ b/lnbits/core/services.py
@@ -516,7 +516,7 @@ async def init_admin_settings(super_user: Optional[str] = None) -> SuperSettings
 
 
 class WebsocketConnectionManager:
-    def __init__(self):
+    def __init__(self) -> None:
         self.active_connections: List[WebSocket] = []
 
     async def connect(self, websocket: WebSocket, item_id: str):
diff --git a/lnbits/db.py b/lnbits/db.py
index fdd791d4f..9c692f519 100644
--- a/lnbits/db.py
+++ b/lnbits/db.py
@@ -59,6 +59,15 @@ else:
         )
 
 
+def compat_timestamp_placeholder():
+    if DB_TYPE == POSTGRES:
+        return "to_timestamp(?)"
+    elif DB_TYPE == COCKROACH:
+        return "cast(? AS timestamp)"
+    else:
+        return "?"
+
+
 class Compat:
     type: Optional[str] = "<inherited>"
     schema: Optional[str] = "<inherited>"
@@ -107,15 +116,9 @@ class Compat:
             return "BIGINT"
         return "INT"
 
-    @classmethod
     @property
-    def timestamp_placeholder(cls):
-        if DB_TYPE == POSTGRES:
-            return "to_timestamp(?)"
-        elif DB_TYPE == COCKROACH:
-            return "cast(? AS timestamp)"
-        else:
-            return "?"
+    def timestamp_placeholder(self) -> str:
+        return compat_timestamp_placeholder()
 
 
 class Connection(Compat):
@@ -402,7 +405,7 @@ class Filter(BaseModel, Generic[TFilterModel]):
     @property
     def statement(self):
         if self.model and self.model.__fields__[self.field].type_ == datetime.datetime:
-            placeholder = Compat.timestamp_placeholder
+            placeholder = compat_timestamp_placeholder()
         else:
             placeholder = "?"
         if self.op in (Operator.INCLUDE, Operator.EXCLUDE):
diff --git a/lnbits/extension_manager.py b/lnbits/extension_manager.py
index 1e1abe45d..957037474 100644
--- a/lnbits/extension_manager.py
+++ b/lnbits/extension_manager.py
@@ -204,7 +204,7 @@ class Extension(NamedTuple):
 
 
 class ExtensionManager:
-    def __init__(self):
+    def __init__(self) -> None:
         p = Path(settings.lnbits_path, "extensions")
         Path(p).mkdir(parents=True, exist_ok=True)
         self._extension_folders: List[Path] = [f for f in p.iterdir() if f.is_dir()]
diff --git a/lnbits/tasks.py b/lnbits/tasks.py
index 506880ee0..2f95a42be 100644
--- a/lnbits/tasks.py
+++ b/lnbits/tasks.py
@@ -149,7 +149,7 @@ async def check_pending_payments():
             logger.info(
                 f"Task: checking all pending payments (incoming={incoming}, outgoing={outgoing}) of last 15 days"
             )
-            start_time: float = time.time()
+            start_time = time.time()
             pending_payments = await get_payments(
                 since=(int(time.time()) - 60 * 60 * 24 * 15),  # 15 days ago
                 complete=False,
@@ -168,7 +168,7 @@ async def check_pending_payments():
             # we delete expired invoices once upon the first pending check
             if incoming:
                 logger.debug("Task: deleting all expired invoices")
-                start_time: float = time.time()
+                start_time = time.time()
                 await delete_expired_invoices(conn=conn)
                 logger.info(
                     f"Task: expired invoice deletion finished (took {time.time() - start_time:0.3f} s)"
diff --git a/poetry.lock b/poetry.lock
index 1d0967417..27305b0c2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1078,44 +1078,48 @@ test = ["pytest (<5.4)", "pytest-cov"]
 
 [[package]]
 name = "mypy"
-version = "0.971"
+version = "1.5.1"
 description = "Optional static typing for Python"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.8"
 files = [
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+    {file = "mypy-1.5.1-py3-none-any.whl", hash = "sha256:f757063a83970d67c444f6e01d9550a7402322af3557ce7630d3c957386fa8f5"},
+    {file = "mypy-1.5.1.tar.gz", hash = "sha256:b031b9601f1060bf1281feab89697324726ba0c0bae9d7cd7ab4b690940f0b92"},
 ]
 
 [package.dependencies]
-mypy-extensions = ">=0.4.3"
+mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=3.10"
+typing-extensions = ">=4.1.0"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
-python2 = ["typed-ast (>=1.4.0,<2)"]
+install-types = ["pip"]
 reports = ["lxml"]
 
 [[package]]
@@ -2284,4 +2288,4 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10 | ^3.9"
-content-hash = "e3d7e1cba4ce9213f39e6f972400ad01e81a561078bf90eb1c1fbfd752a8cac2"
+content-hash = "1c9503faaa16edf4068424ef3e48b2e354fb9414c8743d9bf55b18efbe0f2ce4"
diff --git a/pyproject.toml b/pyproject.toml
index 40e1f24b7..b0c4ae8d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ mock = "^4.0.3"
 black = "^23.7.0"
 pytest-asyncio = "^0.19.0"
 pytest-cov = "^4.1.0"
-mypy = "^0.971"
+mypy = "^1.5.1"
 types-protobuf = "^3.19.22"
 pre-commit = "^3.2.2"
 types-mock = "^5.0.0.6"