diff --git a/mr/build.gradle b/mr/build.gradle
index 4fa4d8753..c296b2c5d 100644
--- a/mr/build.gradle
+++ b/mr/build.gradle
@@ -65,7 +65,7 @@ dependencies {
 
     testImplementation(project(":test:shared"))
     testImplementation("com.fasterxml.jackson.core:jackson-databind:2.21.3")
-    testImplementation("io.netty:netty-all:4.2.10.Final")
+    testImplementation("io.netty:netty-all:4.2.15.Final")
     testImplementation("org.elasticsearch:securemock:1.2")
 
     itestEmbedded(project(":test:shared"))
diff --git a/test/shared/build.gradle b/test/shared/build.gradle
index facc163a9..a2abd7c68 100644
--- a/test/shared/build.gradle
+++ b/test/shared/build.gradle
@@ -80,7 +80,7 @@ dependencies {
 
     implementation("org.hamcrest:hamcrest-all:${project.ext.hamcrestVersion}")
 
-    implementation("io.netty:netty-all:4.0.56.Final") {
+    implementation("io.netty:netty-all:4.2.15.Final") {
         because "Needed for creating mock SSL Server to test against"
     }