diff --git a/src/aleph/vm/controllers/firecracker/program.py b/src/aleph/vm/controllers/firecracker/program.py
index 2bc060200..6b7436899 100644
--- a/src/aleph/vm/controllers/firecracker/program.py
+++ b/src/aleph/vm/controllers/firecracker/program.py
@@ -284,7 +284,7 @@ def __init__(
             prepare_jailer,
         )
 
-    async def setup(self):
+    async def setup(self) -> None:
         logger.debug(f"Setup started for VM={self.vm_id}")
         await setfacl()
 
@@ -326,7 +326,7 @@ async def wait_for_init(self) -> None:
         """Wait for the custom init inside the virtual machine to signal it is ready."""
         await self.fvm.wait_for_init()
 
-    async def load_configuration(self):
+    async def load_configuration(self) -> None:
         code: bytes | None
         volumes: list[Volume]
 
@@ -342,7 +342,7 @@ async def _setup_configuration(
         input_data: bytes | None,
         interface: Interface,
         volumes: list[Volume],
-    ):
+    ) -> None:
         """Set up the VM configuration. The program mode uses a VSOCK connection to the custom init of the virtual
         machine to send this configuration. Other modes may use Cloud-init, ..."""
         logger.debug("Sending configuration")
diff --git a/src/aleph/vm/controllers/qemu/instance.py b/src/aleph/vm/controllers/qemu/instance.py
index a8b9cde4e..d0d341c91 100644
--- a/src/aleph/vm/controllers/qemu/instance.py
+++ b/src/aleph/vm/controllers/qemu/instance.py
@@ -111,7 +111,7 @@ def make_logs_queue(stdout_identifier, stderr_identifier, skip_past=True) -> tup
     r.add_match(SYSLOG_IDENTIFIER=stderr_identifier)
     queue: asyncio.Queue = asyncio.Queue(maxsize=1000)
 
-    def _ready_for_read():
+    def _ready_for_read() -> None:
         change_type = r.process()  # reset fd status
         if change_type != journal.APPEND:
             return
diff --git a/src/aleph/vm/orchestrator/views/authentication.py b/src/aleph/vm/orchestrator/views/authentication.py
index f1acb2f01..84dd96982 100644
--- a/src/aleph/vm/orchestrator/views/authentication.py
+++ b/src/aleph/vm/orchestrator/views/authentication.py
@@ -68,7 +68,7 @@ def payload_must_be_hex(cls, v: bytes) -> bytes:
         return bytes.fromhex(v.decode())
 
     @root_validator(pre=False, skip_on_failure=True)
-    def check_expiry(cls, values):
+    def check_expiry(cls, values) -> dict[str, bytes]:
         """Check that the token has not expired"""
         payload: bytes = values["payload"]
         content = SignedPubKeyPayload.parse_raw(payload)
@@ -78,7 +78,7 @@ def check_expiry(cls, values):
         return values
 
     @root_validator(pre=False, skip_on_failure=True)
-    def check_signature(cls, values):
+    def check_signature(cls, values) -> dict[str, bytes]:
         """Check that the signature is valid"""
         signature: bytes = values["signature"]
         payload: bytes = values["payload"]