diff --git a/autonity_cli/auth.py b/autonity_cli/auth.py
index 038d18f..c8bf46b 100644
--- a/autonity_cli/auth.py
+++ b/autonity_cli/auth.py
@@ -4,11 +4,13 @@
 import click
 import trezorlib.ethereum as trezor_eth
 from eth_account import Account
-from eth_account._utils.legacy_transactions import encode_transaction
+from eth_account._utils.legacy_transactions import (
+    encode_transaction,
+    serializable_unsigned_transaction_from_dict,
+)
 from eth_account.datastructures import SignedTransaction
 from eth_account.messages import encode_defunct
 from eth_account.signers.local import LocalAccount
-from eth_account.typed_transactions.typed_transaction import TypedTransaction
 from eth_account.types import TransactionDictType
 from eth_typing import ChecksumAddress
 from eth_utils.conversions import to_int
@@ -92,28 +94,48 @@ def device_info(self, features: Features) -> str:
     def sign_transaction(self, params: "TxParams") -> SignedTransaction:
         assert "chainId" in params
         assert "gas" in params
-        assert "maxFeePerGas" in params
-        assert "maxPriorityFeePerGas" in params
         assert "nonce" in params
         assert "to" in params
         assert "value" in params
-        v_int, r_bytes, s_bytes = trezor_eth.sign_tx_eip1559(
-            self.client,
-            self.path,
-            nonce=params["nonce"],
-            gas_limit=params["gas"],
-            to=str(params["to"]),
-            value=params["value"],
-            data=HexBytes(params["data"]) if "data" in params else HexBytes(b""),
-            chain_id=params["chainId"],
-            max_gas_fee=int(params["maxFeePerGas"]),
-            max_priority_fee=int(params["maxPriorityFeePerGas"]),
-        )
+        data_bytes = HexBytes(params["data"] if "data" in params else b"")
+        try:
+            if "gasPrice" in params and params["gasPrice"]:
+                v_int, r_bytes, s_bytes = trezor_eth.sign_tx(
+                    self.client,
+                    self.path,
+                    nonce=cast(int, params["nonce"]),
+                    gas_price=cast(int, params["gasPrice"]),
+                    gas_limit=params["gas"],
+                    to=cast(str, params["to"]),
+                    value=cast(int, params["value"]),
+                    data=data_bytes,
+                    chain_id=params["chainId"],
+                )
+            else:
+                assert "maxFeePerGas" in params
+                assert "maxPriorityFeePerGas" in params
+                v_int, r_bytes, s_bytes = trezor_eth.sign_tx_eip1559(
+                    self.client,
+                    self.path,
+                    nonce=cast(int, params["nonce"]),
+                    gas_limit=params["gas"],
+                    to=cast(str, params["to"]),
+                    value=cast(int, params["value"]),
+                    data=data_bytes,
+                    chain_id=params["chainId"],
+                    max_gas_fee=int(params["maxFeePerGas"]),
+                    max_priority_fee=int(params["maxPriorityFeePerGas"]),
+                )
+        except Cancelled as exc:  # user cancelled optional passphrase prompt
+            raise click.Abort() from exc
         r_int = to_int(r_bytes)
         s_int = to_int(s_bytes)
-        filtered_params = dict((k, v) for (k, v) in params.items() if k != "from")
-        tx_unsigned = TypedTransaction.from_dict(
-            cast(TransactionDictType, filtered_params)
+        filtered_tx = dict((k, v) for (k, v) in params.items() if k not in ("from"))
+        # In a LegacyTransaction, "type" is not a valid field. See EIP-2718.
+        if "type" in filtered_tx and filtered_tx["type"] == "0x0":
+            filtered_tx.pop("type")
+        tx_unsigned = serializable_unsigned_transaction_from_dict(
+            cast(TransactionDictType, filtered_tx)
         )
         tx_encoded = encode_transaction(tx_unsigned, vrs=(v_int, r_int, s_int))
         txhash = keccak(tx_encoded)
diff --git a/autonity_cli/commands/tx.py b/autonity_cli/commands/tx.py
index 4f88c64..745651f 100644
--- a/autonity_cli/commands/tx.py
+++ b/autonity_cli/commands/tx.py
@@ -4,7 +4,6 @@
 
 from click import ClickException, Path, argument, group, option
 from eth_account.datastructures import SignedTransaction
-from eth_typing import HexStr
 from hexbytes import HexBytes
 from web3 import Web3
 
@@ -55,11 +54,6 @@ def tx_group() -> None:
 @option(
     "--data", "-d", help="compiled contract code OR method signature and parameters."
 )
-@option(
-    "--legacy",
-    is_flag=True,
-    help="if set, transaction type is 0x0 (pre-EIP1559), otherwise type is 0x2.",
-)
 def make(
     rpc_endpoint: Optional[str],
     ntn: bool,
@@ -156,12 +150,6 @@ def make(
 
     tx = finalize_tx_from_args(w3, rpc_endpoint, tx, from_addr)
 
-    # If the --legacy flag was given, explicitly set the type,
-    # otherwise have web3 determine it.
-
-    if legacy:
-        tx["type"] = HexStr("0x0")
-
     print(to_json(tx))
 
 
diff --git a/pyproject.toml b/pyproject.toml
index a810bd6..e62b8fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,9 +47,10 @@ allow-direct-references = true
 
 [tool.hatch.envs.default]
 description = "The standard dev, build, and test environment"
+dependencies = ["pyright"]
 
 [tool.hatch.envs.default.scripts]
-test = ["unit-tests", "script-tests"]
+test = ["unit-tests", "script-tests", "check-types"]
 unit-tests = "python -m unittest discover {args:tests}"
 script-tests = [
   "rm -rf test_*",
@@ -60,6 +61,8 @@ script-tests = [
   "hatch run ./scripts/test_account",
   "hatch run ./scripts/test_token",
 ]
+# Keep in default env so it can be used from `github` and `local` envs.
+check-types = "pyright {args}"
 
 [tool.hatch.envs.github]
 description = "Develop and build against autonity.py from Github"
@@ -78,22 +81,15 @@ post-install-commands = [
 
 [tool.hatch.envs.lint]
 description = "Run code linters"
-dependencies = [
-  "black",
-  "check-wheel-contents",
-  "ruff",
-  "pyright",
-  "wheel-inspect",
-]
+dependencies = ["black", "check-wheel-contents", "ruff", "wheel-inspect"]
 
 [tool.hatch.envs.lint.scripts]
-all = ["check-code", "check-wheel", "check-types"]
+all = ["check-code", "check-wheel"]
 check-code = ["ruff check {args:.}", "black --check {args:.}"]
 check-wheel = [
   "hatch build",
   "check-wheel-contents dist/autonity_cli-$(hatch version)-py3-none-any.whl",
 ]
-check-types = "pyright {args}"
 fix-code = "ruff check --fix {args:.}"
 format = [
   "black {args:.}",
diff --git a/typings/trezorlib/ethereum.pyi b/typings/trezorlib/ethereum.pyi
index ea9afaa..9177b57 100644
--- a/typings/trezorlib/ethereum.pyi
+++ b/typings/trezorlib/ethereum.pyi
@@ -12,6 +12,20 @@ def get_address(
     encoded_network: Optional[bytes] = None,
     chunkify: bool = False,
 ) -> str: ...
+def sign_tx(
+    client: TrezorClient,
+    n: Address,
+    nonce: int,
+    gas_price: int,
+    gas_limit: int,
+    to: str,
+    value: int,
+    data: Optional[bytes] = None,
+    chain_id: Optional[int] = None,
+    tx_type: Optional[int] = None,
+    definitions: Optional[messages.EthereumDefinitions] = None,
+    chunkify: bool = False,
+) -> Tuple[int, bytes, bytes]: ...
 def sign_tx_eip1559(
     client: TrezorClient,
     n: Address,