diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e588c0b..8635a8c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -105,7 +105,7 @@ jobs:
         staging="gobang-${{ env.GOBANG_VERSION }}-${{ matrix.target }}"
         mkdir -p "$staging"/{complete,doc}
 
-        cp {README.md,COPYING,UNLICENSE,LICENSE-MIT} "$staging/"
+        cp {README.md,LICENSE} "$staging/"
 
         if [ "${{ matrix.os }}" = "windows-2019" ]; then
           cp "target/${{ matrix.target }}/release/gobang.exe" "$staging/"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..55f2267
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Takayuki Maeda
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.