diff --git a/base_image/faiss b/base_image/faiss
index 2929bf4..f9ccd58 160000
--- a/base_image/faiss
+++ b/base_image/faiss
@@ -1 +1 @@
-Subproject commit 2929bf471bcfbc161e6e97356d33582af29a6c05
+Subproject commit f9ccd582f9a9b8400428625d1ff3217ae83422b9
diff --git a/remote_vector_index_builder/core/common/models/index_builder/faiss/faiss_index_hnsw_cagra_builder.py b/remote_vector_index_builder/core/common/models/index_builder/faiss/faiss_index_hnsw_cagra_builder.py
index fb5c98b..cb3c69d 100755
--- a/remote_vector_index_builder/core/common/models/index_builder/faiss/faiss_index_hnsw_cagra_builder.py
+++ b/remote_vector_index_builder/core/common/models/index_builder/faiss/faiss_index_hnsw_cagra_builder.py
@@ -98,15 +98,14 @@ def _do_convert_gpu_to_cpu_binary_index(
     ):
         try:
             # Convert GPU binary index to CPU binary index
-            cpu_index = faiss.index_binary_gpu_to_cpu(
-                faiss_gpu_build_index_output.gpu_index
-            )
-
-            # Configure CPU Index parameters
+            cpu_index = faiss.IndexBinaryHNSWCagra()
             cpu_index.hnsw.efConstruction = self.ef_construction
             cpu_index.hnsw.efSearch = self.ef_search
             cpu_index.base_level_only = self.base_level_only
 
+            # Convert GPU binary index to CPU binary index
+            faiss_gpu_build_index_output.gpu_index.copyTo(cpu_index)
+
             # Remove reference of GPU Index from the IndexBinaryIDMap
             faiss_gpu_build_index_output.index_id_map.index = None
 
diff --git a/test_remote_vector_index_builder/test_core/conftest.py b/test_remote_vector_index_builder/test_core/conftest.py
index cdf26e5..4cc32f8 100644
--- a/test_remote_vector_index_builder/test_core/conftest.py
+++ b/test_remote_vector_index_builder/test_core/conftest.py
@@ -94,8 +94,8 @@ def is_deleted(self):
 
     def copyTo(self, cpu_index):
         """Mock implementation of copyTo method"""
-        if not isinstance(cpu_index, MockIndexBinaryHNSW):
-            raise TypeError("Target must be IndexBinaryHNSW")
+        if not isinstance(cpu_index, MockIndexBinaryHNSWCagra):
+            raise TypeError("Target must be MockIndexBinaryHNSWCagra")
         # Simulate copying data to CPU index
         return True
 
@@ -160,6 +160,22 @@ def is_deleted(self):
         return _deletion_tracker.is_deleted(self.id)
 
 
+class MockIndexBinaryHNSWCagra(Mock):
+    """Mock for IndexBinaryHNSWCagra"""
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.hnsw = Mock()
+        self.base_level_only = False
+
+    def __del__(self):
+        _deletion_tracker.mark_deleted(self.id)
+
+    @property
+    def is_deleted(self):
+        return _deletion_tracker.is_deleted(self.id)
+
+
 class MockIndexBinaryHNSW(Mock):
     """Mock for faiss.IndexBinaryHNSW"""
 
@@ -218,6 +234,7 @@ def __init__(self):
         self.StandardGpuResources = Mock()
         self.GpuIndexCagra = MockGpuIndexCagra
         self.GpuIndexBinaryCagra = MockGpuIndexBinaryCagra
+        self.IndexBinaryHNSWCagra = MockIndexBinaryHNSWCagra
         self.IndexIDMap = MockIndexIDMap
         self.IndexBinaryIDMap = MockIndexBinaryIDMap
         self.IndexHNSWCagra = MockIndexHNSWCagra