diff --git a/build.gradle b/build.gradle
index bf391dba..f5cf9aa8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -20,7 +20,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.22"
     }
 }
 
diff --git a/fints4k/build.gradle b/fints4k/build.gradle
index 8398b8b2..cf486f58 100644
--- a/fints4k/build.gradle
+++ b/fints4k/build.gradle
@@ -63,7 +63,7 @@ kotlin {
             dependencies {
                 api("org.jetbrains.kotlinx:kotlinx-datetime:$kotlinxDateTimeVersion")
 
-                implementation("net.codinux.log:kmp-log:1.5.1")
+                implementation("net.codinux.log:kmp-log:$klfVersion")
 
                 implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$kotlinxSerializationVersion")
 
diff --git a/gradle.properties b/gradle.properties
index f99ba83b..76c7601b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,12 +5,17 @@ org.gradle.parallel=true
 #org.gradle.workers.max=8
 
 
-kotlinVersion=1.8.20
+kotlinVersion=1.9.22
 
-coroutinesVersion=1.7.2
-ktorVersion=2.3.1
-kotlinxDateTimeVersion=0.4.0
-kotlinxSerializationVersion=1.5.1
+# Coroutines 1.9 (currently RC) requires Kotlin 2.0
+coroutinesVersion=1.8.1
+# Ktor 3.x (RC right now) requires Kotlin 2.0
+ktorVersion=2.3.12
+kotlinxDateTimeVersion=0.6.0
+# kotlinx-serialization 1.7.x requires Kotlin 2.0
+kotlinxSerializationVersion=1.6.3
+
+klfVersion=1.5.1
 
 android.useAndroidX=true
 android.enableJetifier=true
\ No newline at end of file