diff --git a/src/sqlalchemy_cratedb/type/vector.py b/src/sqlalchemy_cratedb/type/vector.py
index 9cde7ea2..a46c406a 100644
--- a/src/sqlalchemy_cratedb/type/vector.py
+++ b/src/sqlalchemy_cratedb/type/vector.py
@@ -44,7 +44,7 @@
 __all__ = ["FloatVector"]
 
 
-def from_db(value: t.Iterable) -> t.Optional[npt.ArrayLike]:
+def from_db(value: t.Iterable) -> t.Optional["npt.ArrayLike"]:
     import numpy as np
 
     # from `pgvector.utils`
@@ -146,13 +146,13 @@ def __init__(self, dimensions: int = None):
     def as_generic(self):
         return sa.ARRAY
 
-    def bind_processor(self, dialect: sa.Dialect) -> t.Callable:
+    def bind_processor(self, dialect: sa.engine.Dialect) -> t.Callable:
         def process(value: t.Iterable) -> t.Optional[t.List]:
             return to_db(value, self.dimensions)
 
         return process
 
-    def result_processor(self, dialect: sa.Dialect, coltype: t.Any) -> t.Callable:
+    def result_processor(self, dialect: sa.engine.Dialect, coltype: t.Any) -> t.Callable:
         def process(value: t.Any) -> t.Optional[npt.ArrayLike]:
             return from_db(value)