diff --git a/build.gradle b/build.gradle
index 9bc28ab..96b020c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,25 +2,23 @@ apply plugin: 'idea'
 apply plugin: 'maven'
 
 buildscript {
-    ext.kotlin_version = '1.3.50'
-    ext.kotlinxcoroutine_version = '1.3.2'
-    ext.kotlinlogging_version = '1.7.6'
-    ext.protobufgradle_version = '0.8.9'
-    ext.grpc_version = '1.24.0'
-    ext.tcnative_version = '2.0.25.Final'
-    ext.junit_version = '4.12'
-    ext.mockito_version = '1.10.19'
+    ext.kotlin_version = '1.4.0'
+    ext.kotlinxcoroutine_version = '1.3.9'
+    ext.kotlinlogging_version = '1.8.3'
+    ext.protobufgradle_version = '0.8.13'
+    ext.grpc_version = '1.31.1'
+    ext.tcnative_version = '2.0.34.Final'
     ext.jackson_version = '2.9.8'
     ext.protoc_version = '3.10.0'
     ext.kroto_version = '0.6.1'
-    ext.slf4j_version = '1.7.28'
-    ext.log4jslf4j_version = '2.12.1'
-    ext.junit5_version = '5.4.2'
-    ext.mockk_version = '1.9.3'
-    ext.assertj_version = '3.12.2'
-    ext.awaitility_version = '3.1.6'
-    ext.clikt_version = '2.1.0'
-    ext.doxygen_version = '0.5'
+    ext.slf4j_version = '1.7.30'
+    ext.log4jslf4j_version = '2.13.3'
+    ext.junit5_version = '5.6.2'
+    ext.mockk_version = '1.10.0'
+    ext.assertj_version = '3.17.2'
+    ext.awaitility_version = '4.0.3'
+    ext.clikt_version = '2.8.0'
+    ext.doxygen_version = '0.6'
 
 
     ext.repos = {
@@ -71,7 +69,7 @@ allprojects {
     apply plugin: 'maven-publish'
 
     group 'com.github.gordonmu.coio'
-    version = '0.7.0'
+    version = '0.7.1'
     if (!project.hasProperty("release")) {
         version += '-SNAPSHOT'
     }
@@ -79,14 +77,14 @@ allprojects {
     repositories repos
 
     compileKotlin {
-        kotlinOptions.jvmTarget = "11"
+        kotlinOptions.jvmTarget = "1.8"
     }
     compileTestKotlin {
-        kotlinOptions.jvmTarget = "11"
+        kotlinOptions.jvmTarget = "1.8"
     }
     java {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
     }
 
     jar {
diff --git a/coio-tls/build.gradle b/coio-tls/build.gradle
index 4607bd4..b85917f 100644
--- a/coio-tls/build.gradle
+++ b/coio-tls/build.gradle
@@ -8,8 +8,8 @@ dependencies {
     implementation group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-jdk8', version: "$kotlinxcoroutine_version"
     implementation group: 'io.github.microutils', name: 'kotlin-logging', version: "$kotlinlogging_version"
     implementation group: 'org.slf4j', name: 'slf4j-api', version: "$slf4j_version"
-    implementation group: 'io.netty', name: 'netty-buffer', version: '4.1.45.Final'
-    implementation group: 'io.netty', name: 'netty-handler', version: '4.1.45.Final'
+    implementation group: 'io.netty', name: 'netty-buffer', version: '4.1.52.Final'
+    implementation group: 'io.netty', name: 'netty-handler', version: '4.1.52.Final'
     implementation group: 'com.github.marianobarrios', name: 'tls-channel', version: '0.4.0'
     runtime group: 'io.netty', name: 'netty-tcnative-boringssl-static', version: "$tcnative_version"
 
diff --git a/coio/src/test/kotlin/FileTests.kt b/coio/src/test/kotlin/FileTests.kt
index 1632a35..7d27e27 100644
--- a/coio/src/test/kotlin/FileTests.kt
+++ b/coio/src/test/kotlin/FileTests.kt
@@ -3,10 +3,10 @@ import kotlinx.coroutines.flow.count
 import kotlinx.coroutines.runBlocking
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatCode
-import org.junit.Assert
 import org.junit.jupiter.api.BeforeAll
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.fail
 import java.io.File
 import java.io.IOException
 import java.nio.ByteBuffer
@@ -111,7 +111,7 @@ class FileTests {
             assertThat(fc.filesCount).isEqualTo(1)
             assertThat(fc.bytesCount).isEqualTo(testFileSize)
             val h1 = fc.get("xyz", 1000000) { f ->
-                Assert.fail("should not regenerate cached file")
+                fail("should not regenerate cached file")
             }
             assertThat(fc.filesCount).isEqualTo(1)
             assertThat(fc.bytesCount).isEqualTo(testFileSize)
diff --git a/coio/src/test/kotlin/NioTestServer.kt b/coio/src/test/kotlin/NioTestServer.kt
index 7a10353..423aa68 100644
--- a/coio/src/test/kotlin/NioTestServer.kt
+++ b/coio/src/test/kotlin/NioTestServer.kt
@@ -3,7 +3,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import java.nio.ByteBuffer
 
-fun main(args: Array<String>) {
+fun main() {
     runBlocking {
         val inc = CoIOTcp.listen(8775)