diff --git a/http/nghttp2_adapters.hpp b/http/nghttp2_adapters.hpp
index 8333b25..ff5e708 100644
--- a/http/nghttp2_adapters.hpp
+++ b/http/nghttp2_adapters.hpp
@@ -9,7 +9,9 @@
 
 #include "logging.hpp"
 
+#include <bit>
 #include <span>
+#include <string_view>
 
 /* This file contains RAII compatible adapters for nghttp2 structures.  They
  * attempt to be as close to a direct call as possible, while keeping the RAII
@@ -139,6 +141,14 @@
         return nghttp2_submit_settings(ptr, NGHTTP2_FLAG_NONE, iv.data(),
                                        iv.size());
     }
+
+    int sessionUpgrade2(std::string_view settingsPayload, bool headRequest)
+    {
+        return nghttp2_session_upgrade2(
+            ptr, std::bit_cast<uint8_t*>(settingsPayload.data()),
+            settingsPayload.size(), headRequest ? 1 : 0, nullptr);
+    }
+
     void setUserData(void* object)
     {
         nghttp2_session_set_user_data(ptr, object);