diff --git a/README.md b/README.md
index 21a9143ca5..b5eacd88e7 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ released in late 2009.
 
 ## Prerequisites
 
-OpenRS2 requires version 8 or later of the [Java Development Kit][jdk].
+OpenRS2 requires version 11 or later of the [Java Development Kit][jdk].
 
 The JDK is required even if a pre-built copy of OpenRS2 is used, as it depends
 on JDK-only tools, such as `jarsigner`, at runtime.
diff --git a/build.gradle.kts b/build.gradle.kts
index 9ad7c08a8e..73f5ae4015 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -41,14 +41,14 @@ allprojects {
         configure<JavaPluginExtension> {
             withSourcesJar()
 
-            sourceCompatibility = JavaVersion.VERSION_1_8
-            targetCompatibility = JavaVersion.VERSION_1_8
+            sourceCompatibility = JavaVersion.VERSION_11
+            targetCompatibility = JavaVersion.VERSION_11
         }
     }
 
     tasks.withType<KotlinCompile> {
         kotlinOptions {
-            jvmTarget = "1.8"
+            jvmTarget = "11"
             freeCompilerArgs = listOf("-Xjsr305=strict")
         }
     }
diff --git a/jsobject/build.gradle.kts b/jsobject/build.gradle.kts
deleted file mode 100644
index 876b8eb221..0000000000
--- a/jsobject/build.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-plugins {
-    `java-library`
-    `maven-publish`
-}
-
-publishing {
-    publications.create<MavenPublication>("maven") {
-        from(components["java"])
-
-        pom {
-            packaging = "jar"
-            name.set("OpenRS2 JavaScript Object")
-            description.set(
-                """
-                Stubs for the netscape.javascript package.
-            """.trimIndent()
-            )
-        }
-    }
-}
diff --git a/jsobject/src/main/java/netscape/javascript/JSObject.java b/jsobject/src/main/java/netscape/javascript/JSObject.java
deleted file mode 100644
index e91b86f37e..0000000000
--- a/jsobject/src/main/java/netscape/javascript/JSObject.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package netscape.javascript;
-
-import java.applet.Applet;
-
-public abstract class JSObject {
-	public static JSObject getWindow(Applet applet) {
-		return null;
-	}
-
-	public abstract Object call(String methodName, Object... args);
-	public abstract Object eval(String s);
-}
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 79a1403ba9..39291edba4 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -11,8 +11,7 @@ include(
     "deob",
     "deob-annotations",
     "deob-ast",
-    "game",
-    "jsobject"
+    "game"
 )
 
 if (Files.exists(rootProject.projectDir.toPath().resolve("nonfree/build.gradle.kts"))) {