diff --git a/CHANGELOG.md b/CHANGELOG.md
index faaa398..2f3c035 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
-## Version 0.3.0-SNAPSHOT
+## Version 0.4.0-SNAPSHOT
+
+*Work-in-progress for QuPath v0.6.0*
+
+
+## Version 0.3.0
 
 * Compatibility with QuPath v0.5.0
   * Improved `DnnModel` implementation with better memory management
diff --git a/build.gradle b/build.gradle
index 26ffa7d..01694b1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ ext.qupathVersion = gradle.ext.qupathVersion
 
 base {
 	description = 'QuPath extension to use Deep Java Library'
-	version = "0.3.1-SNAPSHOT"
+	version = "0.4.0-SNAPSHOT"
 	group = 'io.github.qupath'
 }
 
@@ -65,11 +65,11 @@ tasks.register("copyDependencies", Copy) {
 }
 
 /*
- * Ensure Java 17 compatibility
+ * Ensure Java 21 compatibility
  */
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
     if (project.properties['sources'])
 	    withSourcesJar()
diff --git a/settings.gradle b/settings.gradle
index ba23612..6a0cd59 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,12 +1,12 @@
 pluginManagement {
 	plugins {
-		id 'org.bytedeco.gradle-javacpp-platform' version '1.5.9'
+		id 'org.bytedeco.gradle-javacpp-platform' version '1.5.10'
 	}
 }
 
 rootProject.name = 'qupath-extension-djl'
 
-gradle.ext.qupathVersion = "0.5.0"
+gradle.ext.qupathVersion = "0.6.0-SNAPSHOT"
 
 dependencyResolutionManagement {