diff --git a/external/json b/external/json
index cb58021..2652d82 160000
--- a/external/json
+++ b/external/json
@@ -1 +1 @@
-Subproject commit cb58021b519a57c9d969c0e8bc3a179fe4811f0f
+Subproject commit 2652d82e7728fd26a14896cc37e16559c41d198b
diff --git a/include/tao/config/internal/json_base.hpp b/include/tao/config/internal/json_base.hpp
index d92b3d4..618545c 100644
--- a/include/tao/config/internal/json_base.hpp
+++ b/include/tao/config/internal/json_base.hpp
@@ -16,7 +16,7 @@ namespace tao::config::internal
       pegtl::position position;
 
       json_base()
-         : position( pegtl::internal::iterator{ nullptr, 1, 1, 1 }, "TODO: Delete the default c'tor!" )
+         : position( pegtl::internal::frobnicator{ nullptr, 1, 1, 1 }, "TODO: Delete the default c'tor!" )
       {}
       //      json_base() = delete;
 
diff --git a/include/tao/config/internal/system_utility.hpp b/include/tao/config/internal/system_utility.hpp
index f32314e..b2c28f8 100644
--- a/include/tao/config/internal/system_utility.hpp
+++ b/include/tao/config/internal/system_utility.hpp
@@ -20,7 +20,7 @@ namespace tao::config::internal
 
    [[nodiscard]] inline std::string read_file_throws( const std::string& filename )
    {
-      return pegtl::internal::file_reader( filename ).read();
+      return pegtl::internal::read_file_stdio( filename ).read_string();
    }
 
    [[nodiscard]] inline std::optional< std::string > read_file_nothrow( const std::string& filename )