diff --git a/test-suite-kotlin/build.gradle b/test-suite-kotlin/build.gradle
index 1f9abcc8d3a..1dda93d5bb4 100644
--- a/test-suite-kotlin/build.gradle
+++ b/test-suite-kotlin/build.gradle
@@ -7,14 +7,14 @@ dependencies {
     api "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion"
     api "org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion"
     api "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3"
-    api "org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.3.3"
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.5.1"
     api project(':http-server-netty')
     api project(':http-client')
     api project(':runtime')
 
     testImplementation "org.jetbrains.kotlin:kotlin-test-junit:$kotlinVersion"
     testImplementation "org.jetbrains.kotlin:kotlin-test:$kotlinVersion"
-    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.3.2"
+    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.5.1"
 
     // Adding these for now since micronaut-test isnt resolving correctly ... probably need to upgrade gradle there too
     testImplementation("org.junit.jupiter:junit-jupiter-api:$junit5Version")