diff --git a/lib/metrics/meson.build b/lib/metrics/meson.build
index 7d4c073e2..ca210b6ac 100644
--- a/lib/metrics/meson.build
+++ b/lib/metrics/meson.build
@@ -31,7 +31,7 @@ if metrics_impl_optval == 'prometheus'
     # 0.50.0: {'CMake Module'}
     # 0.51.0: {'subproject'}
 
-    libmicrohttpd_dep = dependency('libmicrohttpd', version: '>=0.9.61')
+    libmicrohttpd_dep = dependency('libmicrohttpd', version: '>=0.9.40')
 
     cmake = import('cmake')
     prometheus_client_c_proj = cmake.subproject('prometheus-client-c')
diff --git a/lib/sbi/meson.build b/lib/sbi/meson.build
index 5377857c6..f5c32ae40 100644
--- a/lib/sbi/meson.build
+++ b/lib/sbi/meson.build
@@ -49,7 +49,7 @@ sbi_cc_flags = ['-DOGS_SBI_COMPILATION']
 
 libgnutls_dep = cc.find_library('gnutls', required : true)
 libnghttp2_dep = dependency('libnghttp2', version: '>=1.18.1')
-libmicrohttpd_dep = dependency('libmicrohttpd', version: '>=0.9.61')
+libmicrohttpd_dep = dependency('libmicrohttpd', version: '>=0.9.40')
 libcurl_dep = dependency('libcurl', version: '>=7.52.1')
 
 libsbi = library('ogssbi',
diff --git a/lib/sbi/mhd-server.c b/lib/sbi/mhd-server.c
index 1c68c130c..279e4d035 100644
--- a/lib/sbi/mhd-server.c
+++ b/lib/sbi/mhd-server.c
@@ -289,10 +289,12 @@ static void server_stop(ogs_sbi_server_t *server)
     }
 }
 
+#if MHD_VERSION >= 0x00096100
 static void free_callback(void *cls)
 {
     ogs_free(cls);
 }
+#endif
 
 static bool server_send_response(
         ogs_sbi_stream_t *stream, ogs_sbi_response_t *response)
@@ -330,6 +332,7 @@ static bool server_send_response(
     ogs_assert(mhd_socket != INVALID_SOCKET);
 
     if (response->http.content) {
+#if MHD_VERSION >= 0x00096100
         mhd_response = MHD_create_response_from_buffer_with_free_callback(
                 response->http.content_length, response->http.content,
                 free_callback);
@@ -343,6 +346,12 @@ static bool server_send_response(
          * So, we'll set response->http.content to NULL.
          */
         response->http.content = NULL;
+#else
+        mhd_response = MHD_create_response_from_buffer(
+                response->http.content_length, response->http.content,
+                MHD_RESPMEM_MUST_COPY);
+        ogs_assert(mhd_response);
+#endif
 
     } else {
         mhd_response = MHD_create_response_from_buffer(