diff --git a/pom.xml b/pom.xml
index 89ee7729..84ef9eb3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
  * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
  * SPDX-License-Identifier: MIT
diff --git a/src/it/it-decoloring/pom.xml b/src/it/it-decoloring/pom.xml
index 4994fdfc..bcbd7125 100644
--- a/src/it/it-decoloring/pom.xml
+++ b/src/it/it-decoloring/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
  * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
  * SPDX-License-Identifier: MIT
diff --git a/src/it/settings.xml b/src/it/settings.xml
index 746e0928..cdf68ebb 100644
--- a/src/it/settings.xml
+++ b/src/it/settings.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
  * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
  * SPDX-License-Identifier: MIT
diff --git a/src/site/site.xml b/src/site/site.xml
index b0b4119b..426ac54c 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
  * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
  * SPDX-License-Identifier: MIT