diff --git a/java-client-grpc/build.gradle.kts b/java-client-grpc/build.gradle.kts
index 951ae9f013..bb1b58e4d0 100644
--- a/java-client-grpc/build.gradle.kts
+++ b/java-client-grpc/build.gradle.kts
@@ -27,7 +27,7 @@ java {
     withSourcesJar()
 }
 
-val opensearchVersion = "3.5.0-SNAPSHOT"
+val opensearchVersion = "3.9.0-SNAPSHOT"
 val grpcVersion = "1.68.0"
 val protobufVersion = "3.25.5"
 val opensearchProtobufVersion = "1.2.0"
diff --git a/java-client/build.gradle.kts b/java-client/build.gradle.kts
index b5ff8e6430..b254dfbc42 100644
--- a/java-client/build.gradle.kts
+++ b/java-client/build.gradle.kts
@@ -143,7 +143,7 @@ tasks.build {
     dependsOn("spotlessJavaCheck")
 }
 
-val opensearchVersion = "3.5.0-SNAPSHOT"
+val opensearchVersion = "3.9.0-SNAPSHOT"
 val opensearchDockerVersion = opensearchVersion.removeSuffix("-SNAPSHOT")
 
 tasks.test {
diff --git a/java-codegen/build.gradle.kts b/java-codegen/build.gradle.kts
index a3e921dfa1..4d730c48f6 100644
--- a/java-codegen/build.gradle.kts
+++ b/java-codegen/build.gradle.kts
@@ -175,7 +175,7 @@ dependencies {
     implementation("org.commonmark", "commonmark", "0.24.0")
 
     // EPL-2.0
-    testImplementation(platform("org.junit:junit-bom:6.1.3"))
+    testImplementation(platform("org.junit:junit-bom:5.14.4"))
     testImplementation("org.junit.jupiter", "junit-jupiter")
     testRuntimeOnly("org.junit.platform", "junit-platform-launcher")
 }