diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 3b1c332..c86ed03 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,7 +1,7 @@
 == Changelog
 
 === 2.0.1 (under construction)
-* TBD
+* upgrade to Java 17+
 
 === 2.0.0 (released 01.07.2025)
 * upgrade to Java 11+
diff --git a/gradle/compilation.gradle b/gradle/compilation.gradle
index 9078259..24a3d45 100644
--- a/gradle/compilation.gradle
+++ b/gradle/compilation.gradle
@@ -3,6 +3,9 @@
 compileJava.options.debugOptions.debugLevel = "source,lines,vars"
 
 java {
-  sourceCompatibility = 11
-  targetCompatibility = 11
+  sourceCompatibility = 17
+  targetCompatibility = 17
+  toolchain {
+    languageVersion = JavaLanguageVersion.of(17)
+  }
 }