diff --git a/accessibility-toolbox/build.gradle.kts b/accessibility-toolbox/build.gradle.kts
index 8da11d89f..9e5ccf139 100644
--- a/accessibility-toolbox/build.gradle.kts
+++ b/accessibility-toolbox/build.gradle.kts
@@ -35,13 +35,13 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -53,6 +53,10 @@ android {
     }
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     implementation(project(":utils"))
 
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index 832285481..952deba08 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -39,13 +39,13 @@ android {
 
     compileOptions {
         isCoreLibraryDesugaringEnabled = true
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -63,6 +63,10 @@ android {
     }
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     coreLibraryDesugaring(libs.desugarJdkLibsNio)
 
diff --git a/mlkit-scanner-engine/build.gradle.kts b/mlkit-scanner-engine/build.gradle.kts
index 0f3fde38d..4762df74d 100644
--- a/mlkit-scanner-engine/build.gradle.kts
+++ b/mlkit-scanner-engine/build.gradle.kts
@@ -34,13 +34,13 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -53,6 +53,10 @@ android {
     }
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     implementation(project(":core"))
     implementation(project(":ui"))
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 64007c00c..21275782c 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -5,6 +5,10 @@ pluginManagement {
     }
 }
 
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "1.0.0"
+}
+
 include(
     ":core",
     "kotlin-sample",
diff --git a/ui-toolkit/build.gradle.kts b/ui-toolkit/build.gradle.kts
index ecf0a1188..f67da5128 100644
--- a/ui-toolkit/build.gradle.kts
+++ b/ui-toolkit/build.gradle.kts
@@ -37,13 +37,13 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -66,6 +66,10 @@ android {
 
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     implementation(project(":accessibility-toolbox"))
     implementation(project(":utils"))
diff --git a/ui/build.gradle.kts b/ui/build.gradle.kts
index a0e719caa..1b3662534 100644
--- a/ui/build.gradle.kts
+++ b/ui/build.gradle.kts
@@ -38,13 +38,13 @@ android {
 
     compileOptions {
         isCoreLibraryDesugaringEnabled = true
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -62,6 +62,10 @@ android {
     }
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     coreLibraryDesugaring(libs.desugarJdkLibsNio)
 
diff --git a/utils/build.gradle.kts b/utils/build.gradle.kts
index e0eead33d..6773080cd 100644
--- a/utils/build.gradle.kts
+++ b/utils/build.gradle.kts
@@ -38,13 +38,13 @@ android {
 
     compileOptions {
         isCoreLibraryDesugaringEnabled = true
-        sourceCompatibility = JavaVersion.VERSION_21
-        targetCompatibility = JavaVersion.VERSION_21
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget = JvmTarget.JVM_21
+            jvmTarget = JvmTarget.JVM_17
             freeCompilerArgs.addAll(
                 "-jvm-default=enable"
             )
@@ -62,6 +62,10 @@ android {
     }
 }
 
+kotlin {
+    jvmToolchain(21)
+}
+
 dependencies {
     coreLibraryDesugaring(libs.desugarJdkLibsNio)