diff --git a/FloconAndroid/flocon-base/build.gradle.kts b/FloconAndroid/flocon-base/build.gradle.kts
index 0cbd1bb7..4c63dfe7 100644
--- a/FloconAndroid/flocon-base/build.gradle.kts
+++ b/FloconAndroid/flocon-base/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     alias(libs.plugins.kotlin.multiplatform)
     alias(libs.plugins.android.library)
@@ -5,7 +7,11 @@ plugins {
 }
 
 kotlin {
-    androidTarget()
+    androidTarget {
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_11)
+        }
+    }
     
     jvm()
 
@@ -62,6 +68,7 @@ android {
             )
         }
     }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
diff --git a/FloconAndroid/flocon/build.gradle.kts b/FloconAndroid/flocon/build.gradle.kts
index bcabc819..337f2b1e 100644
--- a/FloconAndroid/flocon/build.gradle.kts
+++ b/FloconAndroid/flocon/build.gradle.kts
@@ -9,7 +9,11 @@ plugins {
 }
 
 kotlin {
-    androidTarget()
+    androidTarget {
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_11)
+        }
+    }
     
     jvm()
 
@@ -79,7 +83,6 @@ buildConfig {
     buildConfigField("APP_VERSION", System.getenv("PROJECT_VERSION_NAME") ?: project.property("floconVersion") as String)
 }
 
-
 android {
     namespace = "io.github.openflocon.flocon"
     compileSdk = 36
diff --git a/FloconAndroid/gradle/libs.versions.toml b/FloconAndroid/gradle/libs.versions.toml
index 6458cf27..2b6541ed 100644
--- a/FloconAndroid/gradle/libs.versions.toml
+++ b/FloconAndroid/gradle/libs.versions.toml
@@ -4,7 +4,7 @@ apollo = "4.0.0"
 coilCompose = "3.2.0"
 compose = "1.9.0"
 datastorePreferences = "1.1.7"
-kotlin = "2.2.0"
+kotlin = "2.1.0"
 mavenPublish = "0.34.0"
 coreKtx = "1.16.0"
 junit = "4.13.2"
@@ -12,7 +12,7 @@ junitVersion = "1.2.1"
 espressoCore = "3.6.1"
 kotlinxCoroutinesBom = "1.10.2"
 kotlinxSerialization = "1.9.0"
-ktor = "3.4.1"
+ktor = "3.2.3"
 lifecycleRuntimeKtx = "2.9.1"
 activityCompose = "1.10.1"
 composeBom = "2025.06.01"
@@ -26,7 +26,7 @@ grpc = "1.70.0"
 protobufPlugin = "0.9.5"
 grpcKotlin = "1.4.3"
 protobuf = "4.26.1"
-ksp = "2.3.6"
+ksp = "2.1.0-1.0.29"
 processPhoenix = "3.0.0"
 sqlite = "2.5.2"
 sqliteJdbc = "3.50.3.0"
diff --git a/FloconAndroid/ktor-interceptor/build.gradle.kts b/FloconAndroid/ktor-interceptor/build.gradle.kts
index 73f545ab..b7d332a7 100644
--- a/FloconAndroid/ktor-interceptor/build.gradle.kts
+++ b/FloconAndroid/ktor-interceptor/build.gradle.kts
@@ -7,7 +7,11 @@ plugins {
 }
 
 kotlin {
-    androidTarget()
+    androidTarget {
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_11)
+        }
+    }
     
     jvm()