diff --git a/.pylintrc b/.pylintrc
index 501e9f3..5c1b324 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -437,6 +437,6 @@ valid-metaclass-classmethod-first-arg=mcs
 
 # Exceptions that will emit a warning when being caught. Defaults to
 # "Exception"
-overgeneral-exceptions=StandardError,
-                       Exception,
-                       BaseException
+overgeneral-exceptions=builtins.StandardError,
+                       builtins.Exception,
+                       builtins.BaseException
diff --git a/deploy.py b/deploy.py
index 35bb0fb..7af3ce1 100755
--- a/deploy.py
+++ b/deploy.py
@@ -1160,7 +1160,7 @@ if __name__ == "__main__":
 
   # We only need the apps_group if we have a board set
   apps_group = main_parser.add_mutually_exclusive_group(
-      required=(partial_args.board is not None))
+      required=partial_args.board is not None)
   apps_group.add_argument(
       "--no-app",
       dest="application",
diff --git a/src/ctap/mod.rs b/src/ctap/mod.rs
index 5c897aa..97e1bc4 100644
--- a/src/ctap/mod.rs
+++ b/src/ctap/mod.rs
@@ -111,8 +111,7 @@ const STATEFUL_COMMAND_TIMEOUT_DURATION: Milliseconds<ClockInt> = Milliseconds(3
 pub const FIDO2_VERSION_STRING: &str = "FIDO_2_0";
 #[cfg(feature = "with_ctap1")]
 pub const U2F_VERSION_STRING: &str = "U2F_V2";
-// TODO(#106) change to final string when ready
-pub const FIDO2_1_VERSION_STRING: &str = "FIDO_2_1_PRE";
+pub const FIDO2_1_VERSION_STRING: &str = "FIDO_2_1";
 
 // We currently only support one algorithm for signatures: ES256.
 // This algorithm is requested in MakeCredential and advertized in GetInfo.
diff --git a/tools/vendor_hid_test.py b/tools/vendor_hid_test.py
index 310d744..1bb1950 100644
--- a/tools/vendor_hid_test.py
+++ b/tools/vendor_hid_test.py
@@ -124,7 +124,7 @@ class HidInterfaces(unittest.TestCase):
   def get_device(cls, usage_page) -> HidDevice:
     devices = list(get_devices(usage_page))
     if len(devices) != 1:
-      raise Exception(f'Found {len(devices)} devices')
+      raise RuntimeError(f'Found {len(devices)} devices')
     return HidDevice(devices[0])
 
   def setUp(self) -> None:
@@ -277,7 +277,7 @@ def get_fido_device() -> CtapHidDevice:
   for d in CtapHidDevice.list_devices():
     if d.descriptor.vid == _OPENSK_VID and d.descriptor.pid == _OPENSK_PID:
       return d
-  raise Exception('Unable to find Fido device')
+  raise RuntimeError('Unable to find Fido device')
 
 
 def get_fido_device_vendor() -> CtapHidDevice: