diff --git a/multicall/call.py b/multicall/call.py
index 565c87ad..600b6296 100644
--- a/multicall/call.py
+++ b/multicall/call.py
@@ -18,6 +18,7 @@
 AnyAddress = Union[str,Address,ChecksumAddress,HexAddress]
 
 class Call:
+    __slots__ = "target", "returns", "block_id", "gas_limit", "state_override_code", "w3", "args", "function", "signature"
     def __init__(
         self, 
         target: AnyAddress, 
diff --git a/multicall/multicall.py b/multicall/multicall.py
index c70abeb6..c42827f8 100644
--- a/multicall/multicall.py
+++ b/multicall/multicall.py
@@ -31,6 +31,7 @@ def unpack_batch_results(batch_results: List[List[CallResponse]]) -> List[CallRe
 
 
 class Multicall:
+    __slots__ = "calls", "block_id", "require_success", "gas_limit", "w3", "chainid", "multicall_sig", "multicall_address"
     def __init__(
         self, 
         calls: List[Call],
@@ -138,6 +139,7 @@ class NotSoBrightBatcher:
     This class helps with processing a large volume of large multicalls.
     It's not so bright, but should quickly bring the batch size down to something reasonable for your node.
     """
+    __slots__ = "step", 
     def __init__(self) -> None:
         self.step = 10000
     
diff --git a/multicall/signature.py b/multicall/signature.py
index f8de5374..00d2b143 100644
--- a/multicall/signature.py
+++ b/multicall/signature.py
@@ -58,6 +58,7 @@ def parse_typestring(typestring: str) -> Optional[List[TypeStr]]:
 
 
 class Signature:
+    __slots__ = "signature", "function", "input_types", "output_types"
     def __init__(self, signature: str) -> None:
         self.signature = signature
         self.function, self.input_types, self.output_types = parse_signature(signature)
diff --git a/pyproject.toml b/pyproject.toml
index 6129fb5f..a51e386c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "multicall"
-version = "0.7.5"
+version = "0.7.6"
 description = "aggregate results from multiple ethereum contract calls"
 authors = ["banteg"]