diff --git a/tests/ut/test_cluster.cc b/tests/ut/test_cluster.cc
index 68dfe209b..bcb84e046 100644
--- a/tests/ut/test_cluster.cc
+++ b/tests/ut/test_cluster.cc
@@ -40,7 +40,7 @@ TEST_CASE("Test Kmeans With Float Vector", "[float metrics]") {
     const std::string NUM_CLUSTERS = "num_clusters";
     auto topk = 1;
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[NUM_CLUSTERS] = num_clusters;
         return json;
diff --git a/tests/ut/test_diskann.cc b/tests/ut/test_diskann.cc
index a03b2d847..fc82bd392 100644
--- a/tests/ut/test_diskann.cc
+++ b/tests/ut/test_diskann.cc
@@ -342,7 +342,7 @@ TEST_CASE("Test DiskANN GetVectorByIds", "[diskann]") {
         fs::remove(kDir);
         REQUIRE_NOTHROW(fs::create_directories(kL2IndexDir));
 
-        auto base_gen = [&] {
+        auto base_gen = [=] {
             knowhere::Json json;
             json[knowhere::meta::RETRIEVE_FRIENDLY] = true;
             json["dim"] = dim;
@@ -351,7 +351,7 @@ TEST_CASE("Test DiskANN GetVectorByIds", "[diskann]") {
             return json;
         };
 
-        auto build_gen = [&]() {
+        auto build_gen = [=]() {
             knowhere::Json json = base_gen();
             json["index_prefix"] = kL2IndexPrefix;
             json["data_path"] = kRawDataPath;
diff --git a/tests/ut/test_feder.cc b/tests/ut/test_feder.cc
index 6c3b49bdd..e172d1f9a 100644
--- a/tests/ut/test_feder.cc
+++ b/tests/ut/test_feder.cc
@@ -144,7 +144,7 @@ TEST_CASE("Test Feder", "[feder]") {
 
     auto version = GenTestVersionList();
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = knowhere::metric::L2;
@@ -153,14 +153,14 @@ TEST_CASE("Test Feder", "[feder]") {
         return json;
     };
 
-    auto ivfflat_gen = [&base_gen]() {
+    auto ivfflat_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NLIST] = 16;
         json[knowhere::indexparam::NPROBE] = 4;
         return json;
     };
 
-    auto hnsw_gen = [&base_gen]() {
+    auto hnsw_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::HNSW_M] = 8;
         json[knowhere::indexparam::EFCONSTRUCTION] = 200;
diff --git a/tests/ut/test_gpu_search.cc b/tests/ut/test_gpu_search.cc
index 9243ff3b4..01bf5a276 100644
--- a/tests/ut/test_gpu_search.cc
+++ b/tests/ut/test_gpu_search.cc
@@ -30,7 +30,7 @@ TEST_CASE("Test All GPU Index", "[search]") {
 
     auto version = GenTestVersionList();
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = knowhere::metric::L2;
@@ -42,21 +42,21 @@ TEST_CASE("Test All GPU Index", "[search]") {
 
     auto bruteforce_gen = base_gen;
 
-    auto ivfflat_gen = [&base_gen]() {
+    auto ivfflat_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NLIST] = 16;
         json[knowhere::indexparam::NPROBE] = 16;
         return json;
     };
 
-    auto ivfpq_gen = [&ivfflat_gen]() {
+    auto ivfpq_gen = [ivfflat_gen]() {
         knowhere::Json json = ivfflat_gen();
         json[knowhere::indexparam::M] = 0;
         json[knowhere::indexparam::NBITS] = 8;
         return json;
     };
 
-    auto cagra_gen = [&base_gen]() {
+    auto cagra_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::INTERMEDIATE_GRAPH_DEGREE] = 128;
         json[knowhere::indexparam::GRAPH_DEGREE] = 64;
diff --git a/tests/ut/test_iterator.cc b/tests/ut/test_iterator.cc
index 9ddebbe08..71c918841 100644
--- a/tests/ut/test_iterator.cc
+++ b/tests/ut/test_iterator.cc
@@ -97,7 +97,7 @@ TEST_CASE("Test Iterator Mem Index With Float Vector", "[float metrics]") {
     auto metric = GENERATE(as<std::string>{}, knowhere::metric::L2, knowhere::metric::COSINE, knowhere::metric::IP);
     auto version = GenTestVersionList();
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = metric;
@@ -105,7 +105,7 @@ TEST_CASE("Test Iterator Mem Index With Float Vector", "[float metrics]") {
         return json;
     };
 
-    auto hnsw_gen = [&base_gen]() {
+    auto hnsw_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::HNSW_M] = 128;
         json[knowhere::indexparam::EFCONSTRUCTION] = 200;
@@ -113,14 +113,14 @@ TEST_CASE("Test Iterator Mem Index With Float Vector", "[float metrics]") {
         return json;
     };
 
-    auto ivfflat_gen = [&base_gen]() {
+    auto ivfflat_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NPROBE] = 16;
         json[knowhere::indexparam::NLIST] = 24;
         return json;
     };
 
-    auto ivfflatcc_gen = [&base_gen]() {
+    auto ivfflatcc_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NPROBE] = 16;
         json[knowhere::indexparam::NLIST] = 24;
@@ -252,7 +252,7 @@ TEST_CASE("Test Iterator IVFFlatCC With Newly Insert Vectors", "[float metrics]
     auto metric = GENERATE(as<std::string>{}, knowhere::metric::L2, knowhere::metric::COSINE, knowhere::metric::IP);
     auto version = GenTestVersionList();
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = metric;
@@ -260,7 +260,7 @@ TEST_CASE("Test Iterator IVFFlatCC With Newly Insert Vectors", "[float metrics]
         return json;
     };
 
-    auto ivfflatcc_gen = [&base_gen]() {
+    auto ivfflatcc_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NPROBE] = 16;
         json[knowhere::indexparam::NLIST] = 24;
@@ -332,7 +332,7 @@ TEST_CASE("Test Iterator Mem Index With Binary Metrics", "[binary metrics]") {
     auto metric = GENERATE(as<std::string>{}, knowhere::metric::HAMMING, knowhere::metric::JACCARD);
     auto version = GenTestVersionList();
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = metric;
@@ -340,7 +340,7 @@ TEST_CASE("Test Iterator Mem Index With Binary Metrics", "[binary metrics]") {
         return json;
     };
 
-    auto hnsw_gen = [&base_gen]() {
+    auto hnsw_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::HNSW_M] = 128;
         json[knowhere::indexparam::EFCONSTRUCTION] = 200;
diff --git a/tests/ut/test_ivfflat_cc.cc b/tests/ut/test_ivfflat_cc.cc
index 39525c38a..84569d044 100644
--- a/tests/ut/test_ivfflat_cc.cc
+++ b/tests/ut/test_ivfflat_cc.cc
@@ -35,7 +35,7 @@ TEST_CASE("Test Build Search Concurrency", "[Concurrency]") {
     int64_t build_task_num = 1;
     int64_t search_task_num = 10;
 
-    auto base_gen = [&]() {
+    auto base_gen = [=]() {
         knowhere::Json json;
         json[knowhere::meta::DIM] = dim;
         json[knowhere::meta::METRIC_TYPE] = metric;
@@ -45,7 +45,7 @@ TEST_CASE("Test Build Search Concurrency", "[Concurrency]") {
         return json;
     };
 
-    auto ivf_gen = [&base_gen]() {
+    auto ivf_gen = [base_gen]() {
         knowhere::Json json = base_gen();
         json[knowhere::indexparam::NLIST] = 128;
         json[knowhere::indexparam::NPROBE] = 16;
@@ -53,14 +53,14 @@ TEST_CASE("Test Build Search Concurrency", "[Concurrency]") {
         return json;
     };
 
-    auto ivf_cc_gen = [&ivf_gen]() {
+    auto ivf_cc_gen = [ivf_gen]() {
         knowhere::Json json = ivf_gen();
         json[knowhere::meta::NUM_BUILD_THREAD] = 1;
         json[knowhere::indexparam::SSIZE] = 48;
         return json;
     };
 
-    auto ivf_sq_8_cc_gen = [&ivf_cc_gen]() {
+    auto ivf_sq_8_cc_gen = [ivf_cc_gen]() {
         knowhere::Json json = ivf_cc_gen();
         json[knowhere::indexparam::CODE_SIZE] = 8;
         return json;
diff --git a/tests/ut/test_search.cc b/tests/ut/test_search.cc
index e74643972..775f95a30 100644
--- a/tests/ut/test_search.cc
+++ b/tests/ut/test_search.cc
@@ -378,7 +378,7 @@ TEST_CASE("Test Mem Index With Float Vector", "[float metrics]") {
                        .value();
         uint32_t nb = 1000;
         uint32_t dim = 128;
-        auto ivf_pq_gen = [&]() {
+        auto ivf_pq_gen = [=]() {
             knowhere::Json json;
             json[knowhere::meta::DIM] = dim;
             json[knowhere::meta::METRIC_TYPE] = knowhere::metric::L2;
@@ -398,7 +398,7 @@ TEST_CASE("Test Mem Index With Float Vector", "[float metrics]") {
                        .value();
         uint32_t nb = 1000;
         uint32_t dim = 128;
-        auto ivf_pq_gen = [&]() {
+        auto ivf_pq_gen = [=]() {
             knowhere::Json json;
             json[knowhere::meta::DIM] = dim;
             json[knowhere::meta::METRIC_TYPE] = knowhere::metric::L2;