diff --git a/README.md b/README.md
index 3dfd84aae..be022c78e 100644
--- a/README.md
+++ b/README.md
@@ -98,9 +98,9 @@ Then, select one of the following targets and `make` it according to your purpos
 
 | Target      | Description
 |-------------|-------------
-| `all`       | Build shared-library `libmeevax.0.5.306.so` and executable `meevax`.
+| `all`       | Build shared-library `libmeevax.0.5.307.so` and executable `meevax`.
 | `install`   | Copy files into `/usr/local` directly.
-| `package`   | Generate debian package `meevax_0.5.306_amd64.deb` (only Ubuntu). The generated package can be installed by `sudo apt install build/meevax_0.5.306_amd64.deb`.
+| `package`   | Generate debian package `meevax_0.5.307_amd64.deb` (only Ubuntu). The generated package can be installed by `sudo apt install build/meevax_0.5.307_amd64.deb`.
 | `test`      | Test executable `meevax`. This target requires Valgrind to be installed.
 | `uninstall` | Remove files copied to `/usr/local` directly by target `install`.
 
diff --git a/VERSION b/VERSION
index 2eef53e3f..0a10e1f39 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.306
+0.5.307
diff --git a/include/meevax/type_traits/is_dereferenceable.hpp b/include/meevax/type_traits/is_dereferenceable.hpp
deleted file mode 100644
index 381b7fa2c..000000000
--- a/include/meevax/type_traits/is_dereferenceable.hpp
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
-   Copyright 2018-2024 Tatsuya Yamasaki.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-#ifndef INCLUDED_MEEVAX_TYPE_TRAITS_IS_DEREFERENCEABLE_HPP
-#define INCLUDED_MEEVAX_TYPE_TRAITS_IS_DEREFERENCEABLE_HPP
-
-#include <type_traits>
-
-namespace meevax::inline type_traits
-{
-  template <typename T, typename = void>
-  [[deprecated]]
-  struct is_dereferenceable
-    : public std::false_type
-  {};
-
-  template <typename T>
-  [[deprecated]]
-  struct is_dereferenceable<T, std::void_t<decltype(*std::declval<T>())>>
-    : public std::true_type
-  {};
-} // namespace meevax::type_traits
-
-#endif // INCLUDED_MEEVAX_TYPE_TRAITS_IS_DEREFERENCEABLE_HPP