diff --git a/build.gradle b/build.gradle
index 1d39cef8..b59daeb2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '2.0.0'
+    ext.kotlin_version = '1.9.24'
     repositories {
         mavenCentral()
         //Needed only for SNAPSHOT versions
@@ -69,7 +69,7 @@ dependencies {
     implementation 'javax.annotation:javax.annotation-api:1.3.2'
     implementation 'build.buf:protovalidate:0.2.1'
 
-    testImplementation 'org.jetbrains.kotlin:kotlin-stdlib:2.0.0'
+    testImplementation 'org.jetbrains.kotlin:kotlin-stdlib:1.9.24'
     testImplementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.3'
     testImplementation 'org.junit.jupiter:junit-jupiter:5.10.2'
     testImplementation 'io.grpc:grpc-okhttp:1.64.0'