diff --git a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/provider.py b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/provider.py
index 2ba4945a..15c86f67 100644
--- a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/provider.py
+++ b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/provider.py
@@ -82,8 +82,7 @@ def setup_resolver(self) -> AbstractResolver:
             )
 
     def initialize(self, evaluation_context: EvaluationContext) -> None:
-        if hasattr(self.resolver, "initialize"):
-            self.resolver.initialize(evaluation_context)
+        self.resolver.initialize(evaluation_context)
 
     def shutdown(self) -> None:
         if self.resolver:
diff --git a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/__init__.py b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/__init__.py
index 53e17938..1b77c0c8 100644
--- a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/__init__.py
+++ b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/__init__.py
@@ -10,6 +10,9 @@
 
 
 class AbstractResolver(Protocol):
+    def initialize(self, evaluation_context: EvaluationContext) -> None:
+        return
+
     def shutdown(self) -> None: ...
 
     def resolve_boolean_details(
diff --git a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/grpc.py b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/grpc.py
index caab101a..c2f98522 100644
--- a/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/grpc.py
+++ b/providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/grpc.py
@@ -16,11 +16,12 @@
 from ..config import Config
 from ..flag_type import FlagType
 from ..proto.schema.v1 import schema_pb2, schema_pb2_grpc
+from . import AbstractResolver
 
 T = typing.TypeVar("T")
 
 
-class GrpcResolver:
+class GrpcResolver(AbstractResolver):
     def __init__(self, config: Config):
         self.config = config
         channel_factory = (
diff --git a/providers/openfeature-provider-flagd/test-harness b/providers/openfeature-provider-flagd/test-harness
index 6197b3d9..c9e0be36 160000
--- a/providers/openfeature-provider-flagd/test-harness
+++ b/providers/openfeature-provider-flagd/test-harness
@@ -1 +1 @@
-Subproject commit 6197b3d956d358bf662e5b8e0aebdc4800480f6b
+Subproject commit c9e0be36e89ad33aa99b8e32b40d67e9bf350f88