diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index 2941f9c3ab..bb0b836788 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -58,7 +58,7 @@ jobs:
           cache-dependency-path: 'setup.py'
       - name: Install dependencies
         run: |
-          python -m pip install -U pip mypy==0.990
+          python -m pip install -U pip mypy==1.2
           pip install -e ".[zstd, encryption, ocsp]"
       - name: Run mypy
         run: |
diff --git a/bson/decimal128.py b/bson/decimal128.py
index ab2d1a24ac..bce5b251e9 100644
--- a/bson/decimal128.py
+++ b/bson/decimal128.py
@@ -100,7 +100,7 @@ def _decimal_to_128(value: _VALUE_OPTIONS) -> Tuple[int, int]:
         if significand & (1 << i):
             high |= 1 << (i - 64)
 
-    biased_exponent = exponent + _EXPONENT_BIAS
+    biased_exponent = exponent + _EXPONENT_BIAS  # type: ignore[operator]
 
     if high >> 49 == 1:
         high = high & 0x7FFFFFFFFFFF
diff --git a/bson/son.py b/bson/son.py
index e4238b4058..bba108aa80 100644
--- a/bson/son.py
+++ b/bson/son.py
@@ -66,7 +66,7 @@ def __init__(
         self.update(kwargs)
 
     def __new__(cls: Type["SON[_Key, _Value]"], *args: Any, **kwargs: Any) -> "SON[_Key, _Value]":
-        instance = super(SON, cls).__new__(cls, *args, **kwargs)
+        instance = super(SON, cls).__new__(cls, *args, **kwargs)  # type: ignore[type-var]
         instance.__keys = []
         return instance
 
@@ -115,7 +115,7 @@ def clear(self) -> None:
         self.__keys = []
         super(SON, self).clear()
 
-    def setdefault(self, key: _Key, default: _Value) -> _Value:  # type: ignore[override]
+    def setdefault(self, key: _Key, default: _Value) -> _Value:
         try:
             return self[key]
         except KeyError:
diff --git a/test/test_encryption.py b/test/test_encryption.py
index 6cdc8da3b6..872e0356ad 100644
--- a/test/test_encryption.py
+++ b/test/test_encryption.py
@@ -2162,7 +2162,7 @@ def test_05_tlsDisableOCSPEndpointCheck_is_permitted(self):
         self.addCleanup(encryption.close)
         ctx = encryption._io_callbacks.opts._kms_ssl_contexts["aws"]
         if not hasattr(ctx, "check_ocsp_endpoint"):
-            raise self.skipTest("OCSP not enabled")  # type:ignore
+            raise self.skipTest("OCSP not enabled")
         self.assertFalse(ctx.check_ocsp_endpoint)