diff --git a/requirements/base.txt b/requirements/base.txt
index 8a2c639cc..640879bc5 100755
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -3,5 +3,6 @@ jsonschema<5,>=3.2  # TODO: evaluate risk of removing jsonschema 3.x support
 typing_extensions>=4.4 # 3.8 doesn't have Required, TypeGuard and ParamSpec
 
 # resource validation & schema generation
-# 1.10.15 and 1.10.17 included breaking change from pydantic, more info: https://github.com/aws/serverless-application-model/issues/3617
-pydantic>=1.8,<3,!=1.10.15,!=1.10.17
+# we should remove support for Python 3.8 soon (and 3.9), but supporting it for now
+pydantic>=2.10.6; python_version>="3.8"
+pydantic~=2.12.5; python_version>="3.9"
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 911e125a7..1a1227bc6 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -23,7 +23,7 @@ black==24.3.0
 ruamel.yaml==0.17.21  # It can parse yaml while perserving comments
 
 # type check
-mypy~=1.3.0
+mypy~=1.10.1
 
 # types
 boto3-stubs[appconfig,serverlessrepo]>=1.34.0,<2.0.0
diff --git a/samtranslator/model/__init__.py b/samtranslator/model/__init__.py
index 3005d2493..be2682a2e 100644
--- a/samtranslator/model/__init__.py
+++ b/samtranslator/model/__init__.py
@@ -824,7 +824,7 @@ def resolve_resource_type(self, resource_dict: Dict[str, Any]) -> Any:
 
 
 class ResourceResolver:
-    def __init__(self, resources: Dict[str, Any]) -> None:
+    def __init__(self, resources: Dict[str, Dict[str, Any]]) -> None:
         """
         Instantiate the resolver
         :param dict resources: Map of resource
@@ -832,7 +832,6 @@ def __init__(self, resources: Dict[str, Any]) -> None:
 
         if not isinstance(resources, dict):
             raise TypeError("'Resources' is either null or not a valid dictionary.")
-
         self.resources = resources
 
     def get_all_resources(self) -> Dict[str, Any]:
@@ -850,7 +849,6 @@ def get_resource_by_logical_id(self, _input: str) -> Optional[Dict[str, Any]]:
         """
         if not isinstance(_input, str):
             raise TypeError(f"Invalid logical ID '{_input}'. Expected a string.")
-
         return self.resources.get(_input, None)
 
 
diff --git a/samtranslator/model/apigateway.py b/samtranslator/model/apigateway.py
index c737c810b..70585c4aa 100644
--- a/samtranslator/model/apigateway.py
+++ b/samtranslator/model/apigateway.py
@@ -522,7 +522,7 @@ def _get_identity_header(self) -> Optional[str]:
         if not self.identity or not self.identity.get("Header"):
             return "Authorization"
 
-        return self.identity.get("Header")
+        return self.identity.get("Header")  # type: ignore[no-any-return]
 
     def _get_reauthorize_every(self) -> Optional[PassThrough]:
         if not self.identity:
diff --git a/samtranslator/model/stepfunctions/generators.py b/samtranslator/model/stepfunctions/generators.py
index e5cf744be..0c443a478 100644
--- a/samtranslator/model/stepfunctions/generators.py
+++ b/samtranslator/model/stepfunctions/generators.py
@@ -396,7 +396,7 @@ def _get_paths_to_intrinsics(self, _input, path=None):  # type: ignore[no-untype
         else:
             return dynamic_value_paths
 
-        for key, value in sorted(iterator, key=lambda item: item[0]):  # type: ignore[no-any-return]
+        for key, value in sorted(iterator, key=lambda item: item[0]):
             if is_intrinsic(value) or is_dynamic_reference(value):
                 dynamic_value_paths.append([*path, key])
             elif isinstance(value, (dict, list)):