diff --git a/ethpm/_utils/deployments.py b/ethpm/_utils/deployments.py
index 13ef648a93..e6cfe7f927 100644
--- a/ethpm/_utils/deployments.py
+++ b/ethpm/_utils/deployments.py
@@ -70,7 +70,7 @@ def validate_linked_references(
                 "Error validating linked reference. "
                 f"Offset: {offset} "
                 f"Value: {values[idx]} "
-                f"Bytecode: {bytecode} ."
+                f"Bytecode: {bytecode!r} ."
             )
 
 
@@ -122,8 +122,8 @@ def validate_deployments_tx_receipt(
                 if tx_receipt["blockHash"] != to_bytes(hexstr=data["block"]):
                     raise EthPMValidationError(
                         f"Error validating tx_receipt for {name} deployment. "
-                        f"Block found in manifest's deployment data: {data['block']} does not "
-                        f"Does not match block found on tx_receipt: {tx_receipt['blockHash']}."
+                        f"Block found in manifest's deployment data: {data['block']!r} does not "
+                        f"Does not match block found on tx_receipt: {tx_receipt['blockHash']!r}."
                     )
             elif allow_missing_data is False:
                 raise EthPMValidationError(
diff --git a/ethpm/package.py b/ethpm/package.py
index 79d1a20d5d..139c412614 100644
--- a/ethpm/package.py
+++ b/ethpm/package.py
@@ -301,7 +301,7 @@ def get_contract_instance(self, name: ContractName, address: Address) -> Contrac
         except KeyError:
             raise InsufficientAssetsError(
                 "Package does not have the ABI required to generate a contract instance "
-                f"for contract: {name} at address: {address}."
+                f"for contract: {name} at address: {address!r}."
             )
         contract_kwargs = generate_contract_factory_kwargs(
             self.manifest["contractTypes"][name]
diff --git a/ethpm/validation/misc.py b/ethpm/validation/misc.py
index 14f05012dc..2b3807c203 100644
--- a/ethpm/validation/misc.py
+++ b/ethpm/validation/misc.py
@@ -22,8 +22,8 @@ def validate_empty_bytes(offset: int, length: int, bytecode: bytes) -> None:
     slot = bytecode[offset:slot_length]
     if slot != bytearray(length):
         raise EthPMValidationError(
-            f"Bytecode segment: [{offset}:{slot_length}] is not comprised of empty bytes, "
-            f"rather: {slot}."
+            f"Bytecode segment: [{offset}:{slot_length}] "
+            f"is not comprised of empty bytes, rather: {slot!r}."
         )
 
 
diff --git a/newsfragments/1980.misc.rst b/newsfragments/1980.misc.rst
new file mode 100644
index 0000000000..7e2931c1c9
--- /dev/null
+++ b/newsfragments/1980.misc.rst
@@ -0,0 +1 @@
+Update mypy from 0.730 to 0.812
diff --git a/setup.py b/setup.py
index d2f0caf2f9..10c2ba37ee 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
     'linter': [
         "flake8==3.8.3",
         "isort>=4.2.15,<4.3.5",
-        "mypy==0.730",
+        "mypy==0.812",
     ],
     'docs': [
         "mock",
diff --git a/web3/_utils/abi.py b/web3/_utils/abi.py
index 2288b98584..7fbdc9968b 100644
--- a/web3/_utils/abi.py
+++ b/web3/_utils/abi.py
@@ -580,7 +580,7 @@ def get_constructor_abi(contract_abi: ABI) -> ABIFunction:
         abi for abi in contract_abi if abi['type'] == 'constructor'
     ]
     if len(candidates) == 1:
-        return cast(ABIFunction, candidates[0])
+        return candidates[0]
     elif len(candidates) == 0:
         return None
     elif len(candidates) > 1:
diff --git a/web3/_utils/events.py b/web3/_utils/events.py
index 34468c5730..896535af7e 100644
--- a/web3/_utils/events.py
+++ b/web3/_utils/events.py
@@ -332,8 +332,8 @@ def fromBlock(self, value: BlockIdentifier) -> None:
             self._fromBlock = value
         else:
             raise ValueError(
-                "fromBlock is already set to {0}. "
-                "Resetting filter parameters is not permitted".format(self._fromBlock))
+                f"fromBlock is already set to {self._fromBlock!r}. "
+                "Resetting filter parameters is not permitted")
 
     @property
     def toBlock(self) -> BlockIdentifier:
@@ -345,8 +345,8 @@ def toBlock(self, value: BlockIdentifier) -> None:
             self._toBlock = value
         else:
             raise ValueError(
-                "toBlock is already set to {0}. "
-                "Resetting filter parameters is not permitted".format(self._toBlock))
+                f"toBlock is already set to {self._toBlock!r}. "
+                "Resetting filter parameters is not permitted")
 
     @property
     def address(self) -> ChecksumAddress:
@@ -358,8 +358,8 @@ def address(self, value: ChecksumAddress) -> None:
             self._address = value
         else:
             raise ValueError(
-                "address is already set to {0}. "
-                "Resetting filter parameters is not permitted".format(self.address))
+                f"address is already set to {self.address!r}. "
+                "Resetting filter parameters is not permitted")
 
     @property
     def ordered_args(self) -> Tuple[Any, ...]:
diff --git a/web3/_utils/method_formatters.py b/web3/_utils/method_formatters.py
index 1562d7806b..de94ed2904 100644
--- a/web3/_utils/method_formatters.py
+++ b/web3/_utils/method_formatters.py
@@ -586,7 +586,7 @@ def get_request_formatters(
 
 def raise_block_not_found(params: Tuple[BlockIdentifier, bool]) -> NoReturn:
     block_identifier = params[0]
-    raise BlockNotFound(f"Block with id: {block_identifier} not found.")
+    raise BlockNotFound(f"Block with id: {block_identifier!r} not found.")
 
 
 def raise_block_not_found_for_uncle_at_index(
@@ -595,13 +595,14 @@ def raise_block_not_found_for_uncle_at_index(
     block_identifier = params[0]
     uncle_index = to_integer_if_hex(params[1])
     raise BlockNotFound(
-        f"Uncle at index: {uncle_index} of block with id: {block_identifier} not found."
+        f"Uncle at index: {uncle_index} of block with id: "
+        f"{block_identifier!r} not found."
     )
 
 
 def raise_transaction_not_found(params: Tuple[_Hash32]) -> NoReturn:
     transaction_hash = params[0]
-    raise TransactionNotFound(f"Transaction with hash: {transaction_hash} not found.")
+    raise TransactionNotFound(f"Transaction with hash: {transaction_hash!r} not found.")
 
 
 def raise_transaction_not_found_with_index(params: Tuple[BlockIdentifier, int]) -> NoReturn:
@@ -609,7 +610,7 @@ def raise_transaction_not_found_with_index(params: Tuple[BlockIdentifier, int])
     transaction_index = to_integer_if_hex(params[1])
     raise TransactionNotFound(
         f"Transaction index: {transaction_index} "
-        f"on block id: {block_identifier} not found."
+        f"on block id: {block_identifier!r} not found."
     )
 
 
diff --git a/web3/_utils/transactions.py b/web3/_utils/transactions.py
index e484960ffa..165dc7a339 100644
--- a/web3/_utils/transactions.py
+++ b/web3/_utils/transactions.py
@@ -141,8 +141,7 @@ def get_buffered_gas_estimate(
 def get_required_transaction(web3: "Web3", transaction_hash: _Hash32) -> TxData:
     current_transaction = web3.eth.get_transaction(transaction_hash)
     if not current_transaction:
-        raise ValueError('Supplied transaction with hash {} does not exist'
-                         .format(transaction_hash))
+        raise ValueError(f'Supplied transaction with hash {transaction_hash!r} does not exist')
     return current_transaction
 
 
@@ -186,8 +185,8 @@ def prepare_replacement_transaction(
     gas_multiplier: float = 1.125
 ) -> TxParams:
     if current_transaction['blockHash'] is not None:
-        raise ValueError('Supplied transaction with hash {} has already been mined'
-                         .format(current_transaction['hash']))
+        raise ValueError(f'Supplied transaction with hash {current_transaction["hash"]!r} '
+                         'has already been mined')
     if 'nonce' in new_transaction and new_transaction['nonce'] != current_transaction['nonce']:
         raise ValueError('Supplied nonce in new_transaction must match the pending transaction')
 
diff --git a/web3/contract.py b/web3/contract.py
index 340d384b46..579cb4309b 100644
--- a/web3/contract.py
+++ b/web3/contract.py
@@ -1160,9 +1160,9 @@ def _parse_logs(
                     raise e
                 else:
                     warnings.warn(
-                        f"The log with transaction hash: {log['transactionHash']} and "
+                        f"The log with transaction hash: {log['transactionHash']!r} and "
                         f"logIndex: {log['logIndex']} encountered the following error "
-                        f'during processing: {type(e).__name__}({e}). It has been discarded.'
+                        f"during processing: {type(e).__name__}({e}). It has been discarded."
                     )
                     continue
             yield rich_log
@@ -1518,12 +1518,8 @@ def call_contract_function(
             )
         else:
             msg = (
-                "Could not decode contract function call {} return data {} for "
-                "output_types {}".format(
-                    function_identifier,
-                    return_data,
-                    output_types
-                )
+                "Could not decode contract function call {function_identifier} "
+                "return data {return_data!r} for output_types {output_types}"
             )
         raise BadFunctionCallOutput(msg) from e
 
diff --git a/web3/gas_strategies/time_based.py b/web3/gas_strategies/time_based.py
index 4005435d0b..34af8e6cde 100644
--- a/web3/gas_strategies/time_based.py
+++ b/web3/gas_strategies/time_based.py
@@ -113,7 +113,7 @@ def _aggregate_miner_data(
         yield MinerData(
             miner,
             len(set(block_hashes)),
-            min(gas_prices),
+            min(gas_prices),  # type: ignore
             price_percentile)
 
 
diff --git a/web3/middleware/filter.py b/web3/middleware/filter.py
index b1ec26b1a7..5b2f82a417 100644
--- a/web3/middleware/filter.py
+++ b/web3/middleware/filter.py
@@ -240,7 +240,7 @@ def __init__(
             self._from_block = BlockNumber(hex_to_integer(from_block))  # type: ignore
         else:
             # cast b/c LatestBlockParam is handled above
-            self._from_block = cast(BlockNumber, from_block)
+            self._from_block = from_block
         self._to_block = to_block
         self.filter_changes = self._get_filter_changes()
 
@@ -257,7 +257,7 @@ def to_block(self) -> BlockNumber:
         elif is_hex(self._to_block):
             to_block = BlockNumber(hex_to_integer(self._to_block))  # type: ignore
         else:
-            to_block = cast(BlockNumber, self._to_block)
+            to_block = self._to_block
 
         return to_block
 
diff --git a/web3/middleware/stalecheck.py b/web3/middleware/stalecheck.py
index 86711ee67c..7b244653f9 100644
--- a/web3/middleware/stalecheck.py
+++ b/web3/middleware/stalecheck.py
@@ -26,7 +26,10 @@
 
 
 def _isfresh(block: BlockData, allowable_delay: int) -> bool:
-    return block and time.time() - block['timestamp'] <= allowable_delay
+    if block and (time.time() - block['timestamp'] <= allowable_delay):
+        return True
+    else:
+        return False
 
 
 def make_stalecheck_middleware(
diff --git a/web3/pm.py b/web3/pm.py
index 5257db22bd..10cd5ccff7 100644
--- a/web3/pm.py
+++ b/web3/pm.py
@@ -389,13 +389,13 @@ def set_registry(self, address: Union[Address, ChecksumAddress, ENS]) -> None:
             addr_lookup = self.web3.ens.address(str(address))
             if not addr_lookup:
                 raise NameNotFound(
-                    "No address found after ENS lookup for name: {0}.".format(address)
+                    f"No address found after ENS lookup for name: {address!r}."
                 )
             self.registry = SimpleRegistry(addr_lookup, self.web3)
         else:
             raise PMError(
                 "Expected a canonical/checksummed address or ENS name for the address, "
-                "instead received {0}.".format(type(address))
+                f"instead received {type(address)}."
             )
 
     def deploy_and_set_registry(self) -> ChecksumAddress: