diff --git a/aql/column.py b/aql/column.py
index b5acc50..80e082f 100644
--- a/aql/column.py
+++ b/aql/column.py
@@ -84,7 +84,7 @@ class Column:
     def __init__(
         self,
         name: str,
-        ctype: Type = None,
+        ctype: Optional[Type] = None,
         default: Any = NO_DEFAULT,
         table_name: str = "",
     ) -> None:
diff --git a/aql/engines/base.py b/aql/engines/base.py
index 6301d42..6ea9b55 100644
--- a/aql/engines/base.py
+++ b/aql/engines/base.py
@@ -200,7 +200,7 @@ def last_id(self) -> Optional[int]:
         """ID of last modified row, or None if not available."""
         raise self._cursor.lastrowid
 
-    def convert(self, row) -> T:
+    def convert(self, row) -> T:  # type: ignore[type-var]
         """Convert from the cursor's native data type to the query object type."""
         if self._query:
             return self._query.table(row)
diff --git a/aql/query.py b/aql/query.py
index c5154d4..f36b5a7 100644
--- a/aql/query.py
+++ b/aql/query.py
@@ -201,7 +201,7 @@ def orderby(self, column: Column, *args: Union[Column, Order, str]) -> "Query[T]
         return self
 
     @only()
-    def limit(self, n: int, offset: int = None) -> "Query[T]":
+    def limit(self, n: int, offset: Optional[int] = None) -> "Query[T]":
         self._limit = n
         self._offset = offset
         return self
diff --git a/aql/table.py b/aql/table.py
index 5d76715..cf19c72 100644
--- a/aql/table.py
+++ b/aql/table.py
@@ -31,7 +31,10 @@ class Table(Generic[T]):
     """Table specification using custom columns and a source type."""
 
     def __init__(
-        self, name: str, cons: Iterable[Union[Column, Index]], source: Type[T] = None
+        self,
+        name: str,
+        cons: Iterable[Union[Column, Index]],
+        source: Optional[Type[T]] = None,
     ) -> None:
         self._name = name
         self._columns: List[Column] = []
diff --git a/pyproject.toml b/pyproject.toml
index 4a3499f..bdf8895 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dev = [
     "flake8==7",
     "flake8-bugbear==24.4.21",
     "flit==3.9.0",
-    "mypy==0.931",
+    "mypy==1.9.0",
     "usort==1.0.8.post1",
 ]
 docs = [