diff --git a/build-gui/build.gradle b/build-gui/build.gradle
index 8067c2f..b10c89f 100644
--- a/build-gui/build.gradle
+++ b/build-gui/build.gradle
@@ -27,6 +27,12 @@ dependencies {
     implementation "org.openjfx:javafx-controls:$javafx.version:mac"
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(java_language_version)
+    }
+}
+
 application {
     mainClass = ss_main_class
 }
diff --git a/build-server/build.gradle b/build-server/build.gradle
index cdb3dd7..1e2df63 100644
--- a/build-server/build.gradle
+++ b/build-server/build.gradle
@@ -20,6 +20,12 @@ dependencies {
     implementation fileTree(dir: "libs", include: "*.jar")
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(java_language_version)
+    }
+}
+
 jar {
     enabled = false
 }
diff --git a/build-shared/build.gradle b/build-shared/build.gradle
index 9d13c09..6fa42d1 100644
--- a/build-shared/build.gradle
+++ b/build-shared/build.gradle
@@ -19,6 +19,12 @@ dependencies {
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.8.2", "com.eclipsesource.minimal-json:minimal-json:0.9.5"
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(java_language_version)
+    }
+}
+
 jar {
     archiveBaseName = "server-sync"
     archiveClassifier = "shared"