diff --git a/internal/core/src/common/BitsetView.cpp b/internal/core/src/common/BitsetView.cpp
deleted file mode 100644
index a1ced54442..0000000000
--- a/internal/core/src/common/BitsetView.cpp
+++ /dev/null
@@ -1,31 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "common/BitsetView.h"
-
-namespace milvus {
-
-BitsetView
-BitsetView::subview(size_t offset, size_t size) const {
-    if (empty()) {
-        return BitsetView();
-    }
-    assert(offset % 8 == 0);
-    assert((offset + size) <= this.size());
-    return BitsetView(data() + offset / 8, size);
-}
-
-}  // namespace milvus
diff --git a/internal/core/src/common/BitsetView.h b/internal/core/src/common/BitsetView.h
index 12e9baefb0..a5ab535a2d 100644
--- a/internal/core/src/common/BitsetView.h
+++ b/internal/core/src/common/BitsetView.h
@@ -18,22 +18,21 @@
 
 #include <deque>
 #include <boost_ext/dynamic_bitset_ext.hpp>
+
 #include "common/Types.h"
 #include "knowhere/utils/BitsetView.h"
 
 namespace milvus {
 
 class BitsetView : public faiss::BitsetView {
-    using BaseBitsetView = faiss::BitsetView;
-
  public:
     BitsetView() = default;
     ~BitsetView() = default;
 
-    BitsetView(const std::nullptr_t value) : BaseBitsetView(value) {  // NOLINT
+    BitsetView(const std::nullptr_t value) : faiss::BitsetView(value) {  // NOLINT
     }
 
-    BitsetView(const uint8_t* data, size_t num_bits) : BaseBitsetView(data, num_bits) {  // NOLINT
+    BitsetView(const uint8_t* data, size_t num_bits) : faiss::BitsetView(data, num_bits) {  // NOLINT
     }
 
     BitsetView(const BitsetType& bitset)  // NOLINT
@@ -47,7 +46,14 @@ class BitsetView : public faiss::BitsetView {
     }
 
     BitsetView
-    subview(size_t pos, size_t count) const;
+    subview(size_t offset, size_t size) const {
+        if (empty()) {
+            return BitsetView();
+        }
+        assert((offset & 0x7) == 0);
+        assert((offset + size) <= this->size());
+        return BitsetView(data() + (offset >> 3), size);
+    }
 };
 
 }  // namespace milvus
diff --git a/internal/core/src/common/CMakeLists.txt b/internal/core/src/common/CMakeLists.txt
index c7da3b1992..7c894d451c 100644
--- a/internal/core/src/common/CMakeLists.txt
+++ b/internal/core/src/common/CMakeLists.txt
@@ -12,7 +12,6 @@
 set(COMMON_SRC
         Schema.cpp
         Types.cpp
-	BitsetView.cpp
         SystemProperty.cpp
         vector_index_c.cpp
         )
diff --git a/internal/core/thirdparty/knowhere/CMakeLists.txt b/internal/core/thirdparty/knowhere/CMakeLists.txt
index 66cfe1685f..d6b4847170 100644
--- a/internal/core/thirdparty/knowhere/CMakeLists.txt
+++ b/internal/core/thirdparty/knowhere/CMakeLists.txt
@@ -11,8 +11,8 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 #-------------------------------------------------------------------------------
 
-set( KNOWHERE_VERSION v1.1.4 )
-set( KNOWHERE_SOURCE_MD5 "605a11509d54e4af1f6c4f23de8beaa9" )
+set( KNOWHERE_VERSION v1.1.5 )
+set( KNOWHERE_SOURCE_MD5 "5baa7ecaea0e9e5c9f3f440cf8757d3c")
 
 if ( DEFINED ENV{MILVUS_KNOWHERE_URL} )
     set( KNOWHERE_SOURCE_URL "$ENV{MILVUS_KNOWHERE_URL}" )
@@ -21,13 +21,6 @@ else ()
         "https://github.com/milvus-io/knowhere/archive/refs/tags/${KNOWHERE_VERSION}.tar.gz" )
 endif ()
 
-if (MSYS)
-    # TODO(matrixji) replace with official release after `support windows` merged/tagged
-    # windows adaptation + milvus-io/knowhere@v1.1.3
-    set (KNOWHERE_SOURCE_URL "https://github.com/matrixji/knowhere/archive/refs/tags/v1.1.3-win.tar.gz")
-    set (KNOWHERE_SOURCE_MD5 "58021c73c4dc9fce40f429c02968bf79")
-endif (MSYS)
-
 macro(build_knowhere)
     message(STATUS "Building knowhere-${KNOWHERE_VERSION} from source")
     set (KNOWHERE_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX})
@@ -40,7 +33,7 @@ macro(build_knowhere)
 
     externalproject_add(knowhere_ep
             #GIT_REPOSITORY  "https://github.com/milvus-io/knowhere.git"
-            #GIT_TAG         v1.0.1
+            #GIT_TAG         main
             URL             ${KNOWHERE_SOURCE_URL}
             URL_MD5         ${KNOWHERE_SOURCE_MD5}
             CMAKE_ARGS      ${KNOWHERE_CMAKE_ARGS}