diff --git a/bazel/repositories.bzl b/bazel/repositories.bzl
index 233e895b..7949ec41 100644
--- a/bazel/repositories.bzl
+++ b/bazel/repositories.bzl
@@ -38,6 +38,7 @@ def yacl_deps():
     _com_github_google_cpu_features()
     _com_github_dltcollab_sse2neon()
     _com_github_msgpack_msgpack()
+    _com_github_greendow_hash_drbg()
 
     # crypto related
     _com_github_openssl_openssl()
@@ -61,14 +62,6 @@ def yacl_deps():
         remote = "{}/interconnection.git".format(SECRETFLOW_GIT),
     )
 
-    maybe(
-        git_repository,
-        name = "com_github_greendow_hash_drbg",
-        build_file = "@yacl//bazel:hash_drbg.BUILD",
-        commit = "2411fa9d0de81c69dce2a48555c30298253db15d",
-        remote = "https://github.com/greendow/Hash-DRBG.git",
-    )
-
     # Add homebrew openmp for macOS, somehow..homebrew installs to different location on Apple Silcon/Intel macs.. so we need two rules here
     native.new_local_repository(
         name = "macos_omp_x64",
@@ -331,6 +324,19 @@ def _com_github_msgpack_msgpack():
         build_file = "@yacl//bazel:msgpack.BUILD",
     )
 
+def _com_github_greendow_hash_drbg():
+    maybe(
+        http_archive,
+        name = "com_github_greendow_hash_drbg",
+        sha256 = "c03a3da5742d0f0c40232817d84f21d8eed4c4af498c4dff3a51b3bcadcb3787",
+        type = "tar.gz",
+        strip_prefix = "Hash-DRBG-2411fa9d0de81c69dce2a48555c30298253db15d",
+        urls = [
+            "https://github.com/greendow/Hash-DRBG/archive/2411fa9d0de81c69dce2a48555c30298253db15d.tar.gz",
+        ],
+        build_file = "@yacl//bazel:hash_drbg.BUILD",
+    )
+
 def _com_github_herumi_mcl():
     maybe(
         http_archive,
diff --git a/yacl/utils/spi/argument/arg_kv.cc b/yacl/utils/spi/argument/arg_kv.cc
index 4662c703..1075893c 100644
--- a/yacl/utils/spi/argument/arg_kv.cc
+++ b/yacl/utils/spi/argument/arg_kv.cc
@@ -20,12 +20,12 @@ const std::string& SpiArg::Key() const { return key_; }
 
 bool SpiArg::HasValue() const { return value_.has_value(); }
 
-SpiArg SpiArg::operator=(const char* value) {
+SpiArg& SpiArg::operator=(const char* value) {
   value_ = absl::AsciiStrToLower(std::string(value));
   return *this;
 }
 
-SpiArg SpiArg::operator=(const std::string& value) {
+SpiArg& SpiArg::operator=(const std::string& value) {
   value_ = absl::AsciiStrToLower(value);
   return *this;
 }
diff --git a/yacl/utils/spi/argument/arg_kv.h b/yacl/utils/spi/argument/arg_kv.h
index 9939cfe3..9e3bc5a6 100644
--- a/yacl/utils/spi/argument/arg_kv.h
+++ b/yacl/utils/spi/argument/arg_kv.h
@@ -45,8 +45,8 @@ class SpiArg {
   }
 
   // Specialized functions of operator=<T>
-  SpiArg operator=(const char *value);
-  SpiArg operator=(const std::string &value);
+  SpiArg &operator=(const char *value);
+  SpiArg &operator=(const std::string &value);
 
   const std::string &Key() const;
   bool HasValue() const;