diff --git a/README.md b/README.md
index 0077c1d..c2c2f17 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 A tool for reverse engineering Android ROM images.
 
 ##  Requirements
-Make sure you have [JDK17](https://www.oracle.com/java/technologies/downloads/#java17) and [Python3](https://www.python.org/downloads/).
+Make sure you have [JDK11+](https://www.oracle.com/java/technologies/downloads/#java17) and [Python3](https://www.python.org/downloads/).
 
 * Linux / WSL: `sudo apt install git device-tree-compiler lz4 xz-utils zlib1g-dev openjdk-17-jdk gcc g++ python3 python-is-python3 p7zip-full`
 
diff --git a/bbootimg/build.gradle.kts b/bbootimg/build.gradle.kts
index efde796..8f10185 100644
--- a/bbootimg/build.gradle.kts
+++ b/bbootimg/build.gradle.kts
@@ -57,11 +57,16 @@ application {
     mainClass.set("cfig.packable.PackableLauncherKt")
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+}
+
 tasks.withType<KotlinCompile>().all {
     kotlinOptions {
         freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
         freeCompilerArgs += "-opt-in=kotlin.ExperimentalUnsignedTypes"
-        jvmTarget = "17"
+        jvmTarget = "11"
     }
 }
 
diff --git a/helper/build.gradle.kts b/helper/build.gradle.kts
index 61d0ba5..10b34b0 100644
--- a/helper/build.gradle.kts
+++ b/helper/build.gradle.kts
@@ -49,11 +49,16 @@ dependencies {
     testImplementation("com.fasterxml.jackson.core:jackson-databind:2.13.3")
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+}
+
 tasks.withType<KotlinCompile>().all {
     kotlinOptions {
         freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
         freeCompilerArgs += "-opt-in=kotlin.ExperimentalUnsignedTypes"
-        jvmTarget = "17"
+        jvmTarget = "11"
     }
 }