diff --git a/starknet_py/net/schemas/rpc/contract.py b/starknet_py/net/schemas/rpc/contract.py
index f774a4b02..7cf3f8a21 100644
--- a/starknet_py/net/schemas/rpc/contract.py
+++ b/starknet_py/net/schemas/rpc/contract.py
@@ -2,7 +2,7 @@
 
 from marshmallow import EXCLUDE
 from marshmallow import Schema as MarshmallowSchema
-from marshmallow import SchemaOpts, ValidationError, fields, post_load
+from marshmallow import ValidationError, fields, post_load
 
 from starknet_py.abi.v0.schemas import ContractAbiEntrySchema
 from starknet_py.net.client_models import (
@@ -22,7 +22,7 @@
 from starknet_py.net.executable_models import CasmClass
 from starknet_py.net.schemas.common import Felt, NumberAsHex
 from starknet_py.net.schemas.rpc.executables_api import HintSchema
-from starknet_py.utils.schema import ExcludeOpts, Schema
+from starknet_py.utils.schema import Schema
 
 
 class SyncStatusSchema(Schema):
@@ -183,10 +183,7 @@ def make_dataclass(self, data, **kwargs) -> CasmClassEntryPointsByType:
         return CasmClassEntryPointsByType(**data)
 
 
-# TODO(#1564): `CasmClassSchema` should inherit from `Schema` and shouldn't overwrite `OPTION_CLASS`
-#  once issue is resolved.
 class CasmClassSchema(MarshmallowSchema):
-    OPTIONS_CLASS = ExcludeOpts
     prime = NumberAsHex(data_key="prime", required=True)
     bytecode = fields.List(Felt(), data_key="bytecode", required=True)
     bytecode_segment_lengths = fields.List(
diff --git a/starknet_py/utils/schema.py b/starknet_py/utils/schema.py
index 7f8ffb051..304bbd214 100644
--- a/starknet_py/utils/schema.py
+++ b/starknet_py/utils/schema.py
@@ -16,13 +16,5 @@ def __init__(self, meta, **kwargs):
         )
 
 
-# TODO(#1564): `ExcludeOpts` should be removed once issue is resolved.
-class ExcludeOpts(SchemaOpts):
-
-    def __init__(self, meta, **kwargs):
-        SchemaOpts.__init__(self, meta, **kwargs)
-        self.unknown = EXCLUDE
-
-
 class Schema(MarshmallowSchema):
     OPTIONS_CLASS = UnknownOpts