diff --git a/multicall/signature.py b/multicall/signature.py
index 51deec7..d24999e 100644
--- a/multicall/signature.py
+++ b/multicall/signature.py
@@ -114,12 +114,12 @@ def __init__(self, signature: str) -> None:
         output_types = parsed[2]
         self.output_types: Final = output_types
         self.fourbyte: Final = get_4byte_selector(self.function)
-        self._encoder: Final = (
+        self._encoder: Final[faster_eth_abi.encoding.TupleEncoder | None] = (
             TupleEncoder(encoders=tuple(_get_encoder(type_str) for type_str in input_types))
             if input_types
             else None
         )
-        self._decoder: Final = TupleDecoder(
+        self._decoder: Final[faster_eth_abi.decoding.TupleDecoder[Any]] = TupleDecoder(
             decoders=tuple(_get_decoder(type_str) for type_str in output_types)
         )
 
diff --git a/poetry.lock b/poetry.lock
index 3ecc8bc..5411275 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -3981,4 +3981,4 @@ propcache = ">=0.2.1"
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<4"
-content-hash = "5fb40846f13a915c652717c0bd77edb46081464c9a6fcedbe1c24acc0b954c3b"
+content-hash = "a53973cef7936288534bfcb9832046d7dabb1e3eb2a607bcca247f0cfb7030b5"
diff --git a/pyproject.toml b/pyproject.toml
index 87185b4..0d9b17a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ authors = ["banteg"]
 [tool.poetry.dependencies]
 python = ">=3.10,<4"
 cchecksum = ">=0.0.3,<1"
-faster-eth-abi = ">=5.2.1,<6"
+faster-eth-abi = ">=5.2.16,<6"
 web3 = ">=7,<8"
 eth_retry = ">=0.3.5"
 
@@ -57,7 +57,7 @@ requires = [
     "tomli>=2.0.0; python_version < '3.11'",
     "types-requests",
     "eth_retry==0.3.5",
-    "faster-eth-abi==5.2.15",
+    "faster-eth-abi==5.2.29",
 ]
 build-backend = "setuptools.build_meta"