diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index bfab15978..5624ec0dc 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -68,6 +68,7 @@ jobs:
         pip install .
     - name: Run Mypy
       run: mypy qcodes_contrib_drivers
+      if: matrix.python-version != '3.7'
     - name: Run tests
       run: |
         pytest --cov=qcodes_contrib_drivers --cov-report xml --cov-config=setup.cfg qcodes_contrib_drivers
diff --git a/qcodes_contrib_drivers/drivers/NationalInstruments/Switch.py b/qcodes_contrib_drivers/drivers/NationalInstruments/Switch.py
index 4cdc4449f..500ed8126 100644
--- a/qcodes_contrib_drivers/drivers/NationalInstruments/Switch.py
+++ b/qcodes_contrib_drivers/drivers/NationalInstruments/Switch.py
@@ -1,9 +1,8 @@
 import logging
-from typing import Optional, Dict, List, cast
+from typing import Dict, List, Optional, cast
 
-from qcodes import Instrument, InstrumentChannel, ChannelList
-
-from niswitch import Session, PathCapability
+from niswitch import PathCapability, Session
+from qcodes import ChannelList, Instrument, InstrumentChannel
 
 logger = logging.getLogger(__name__)
 
@@ -159,5 +158,5 @@ def disconnect_from_all(self) -> None:
         Disconnect this channel from all channels it is connected to.
         """
         while len(self.connection_list) > 0:
-            ch = cast(InstrumentChannel, self.connection_list[0])
+            ch = self.connection_list[0]
             self.disconnect_from(ch)
diff --git a/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py b/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
index 3e0912286..6e577706b 100644
--- a/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
+++ b/qcodes_contrib_drivers/drivers/QDevil/QDAC2.py
@@ -1554,14 +1554,14 @@ def __exit__(self, exc_type, exc_val, exc_tb):
         # Let Arrangement take care of freeing triggers
         return False
 
-    def actual_values_V(self, gate: str) -> Sequence[float]:
+    def actual_values_V(self, gate: str) -> np.ndarray:
         """The corrected values that would actually be sent to the gate
 
         Args:
             gate (str): Name of gate
 
         Returns:
-            Sequence[float]: Corrected voltages
+            np.ndarray: Corrected voltages
         """
         index = self._arrangement._gate_index(gate)
         return self._sweep[:, index]
diff --git a/qcodes_contrib_drivers/drivers/Spectrum/M4i.py b/qcodes_contrib_drivers/drivers/Spectrum/M4i.py
index a4c590854..8c0810060 100644
--- a/qcodes_contrib_drivers/drivers/Spectrum/M4i.py
+++ b/qcodes_contrib_drivers/drivers/Spectrum/M4i.py
@@ -988,7 +988,9 @@ def _transfer_buffer_numpy(self, memsize: int, numch: int, bytes_per_sample=2) -
             raise Exception(f'Error transferring data: {_errormsg_dict[res]} (0x{res:04x})')
 
         # convert buffer to numpy array
-        output = np.frombuffer(data_buffer, dtype=sample_ctype)
+        # this does not typecheck with numpy 1.22 should be updated
+        # by someone with access to test on the real data.
+        output = np.frombuffer(data_buffer, dtype=sample_ctype) # type: ignore[call-overload]
 
         return output
 
diff --git a/qcodes_contrib_drivers/tests/QDevil/test_sim_qdac2_init.py b/qcodes_contrib_drivers/tests/QDevil/test_sim_qdac2_init.py
index e2a3817c9..2a5470d0e 100644
--- a/qcodes_contrib_drivers/tests/QDevil/test_sim_qdac2_init.py
+++ b/qcodes_contrib_drivers/tests/QDevil/test_sim_qdac2_init.py
@@ -13,8 +13,11 @@ def test_refuse_wrong_model():
     # -----------------------------------------------------------------------
     assert 'Unknown model' in repr(error)
     # Circumvent Instrument not handling exceptions in constructor.
-    Instrument._all_instruments.pop(wrong_instrument)
-
+    # In qcodes < 0.32
+    try:
+        Instrument._all_instruments.pop(wrong_instrument)
+    except KeyError:
+        pass
 
 def test_refuse_incompatible_firmware():
     # -----------------------------------------------------------------------
@@ -23,4 +26,8 @@ def test_refuse_incompatible_firmware():
     # -----------------------------------------------------------------------
     assert 'Incompatible firmware' in repr(error)
     # Circumvent Instrument not handling exceptions in constructor.
-    Instrument._all_instruments.pop('qdac')
+    # In qcodes < 0.32
+    try:
+        Instrument._all_instruments.pop('qdac')
+    except KeyError:
+        pass
diff --git a/setup.cfg b/setup.cfg
index 56849a89c..326ffea44 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -46,6 +46,7 @@ show_column_numbers = True
 warn_unused_ignores = True
 warn_unused_configs = True
 warn_redundant_casts = True
+show_error_codes = True
 
 [mypy-qcodes_contrib_drivers._version]
 ignore_errors = True