diff --git a/build.gradle b/build.gradle
index 0cc3e50..15a0f5a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,8 +17,8 @@ buildscript {
 }
 
 plugins {
-    id 'com.github.kt3k.coveralls' version '2.8.2'
-    id 'com.github.ben-manes.versions' version '0.20.0'
+    id 'com.github.kt3k.coveralls' version '2.10.1'
+    id 'com.github.ben-manes.versions' version '0.28.0'
     id "com.jfrog.bintray" version "1.8.4"
 }
 
@@ -34,7 +34,7 @@ idea {
 
 project.ext {
     artifactGroup = "com.jdiazcano.cfg4k"
-    artifactVersion = "0.9.4"
+    artifactVersion = "0.9.41"
 }
 
 repositories {
diff --git a/cfg4k-core/src/test/kotlin/com/jdiazcano/cfg4k/sources/URLConfigSourceTest.kt b/cfg4k-core/src/test/kotlin/com/jdiazcano/cfg4k/sources/URLConfigSourceTest.kt
index 8962bb9..cc514b9 100644
--- a/cfg4k-core/src/test/kotlin/com/jdiazcano/cfg4k/sources/URLConfigSourceTest.kt
+++ b/cfg4k-core/src/test/kotlin/com/jdiazcano/cfg4k/sources/URLConfigSourceTest.kt
@@ -28,7 +28,7 @@ class URLConfigSourceTest: FeatureSpec({
         val configSource = "a: b"
         val configPath = "/path"
         val server = MockWebServer().apply { start() }
-        val configUrl = server.url(configPath).url()
+        val configUrl = server.url(configPath).toUrl()
 
         scenario("should fetch config") {
             val source = URLConfigSource(configUrl)
@@ -38,7 +38,7 @@ class URLConfigSourceTest: FeatureSpec({
                 val fetchedConfigSource = it.toList().single()
                 fetchedConfigSource.shouldBe(configSource)
 
-                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)
+                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)!!
                 request.method shouldBe "GET"
                 request.path shouldBe configPath
             }
@@ -49,7 +49,7 @@ class URLConfigSourceTest: FeatureSpec({
             server.enqueue(MockResponse().setBody(configSource))
             // Calling use to auto-close the stream
             source.read().use {
-                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)
+                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)!!
                 request.getHeader(AUTH_HEADER).shouldBeNull()
             }
         }
@@ -60,7 +60,7 @@ class URLConfigSourceTest: FeatureSpec({
             server.enqueue(MockResponse().setBody(configSource))
             // Calling use to auto-close the stream
             source.read().use {
-                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)
+                val request = server.takeRequest(1, TimeUnit.MILLISECONDS)!!
                 request.getHeader(AUTH_HEADER).shouldBe(authHeader)
             }
         }
diff --git a/gradle/versions.gradle b/gradle/versions.gradle
index 241c3a6..4310bc9 100644
--- a/gradle/versions.gradle
+++ b/gradle/versions.gradle
@@ -1,22 +1,22 @@
 ext.versions = [
         jetbrains: [
-                kotlin: '1.3.21',
+                kotlin: '1.3.70',
                 spek: '1.1.2',
                 engine: '1.2.1'
         ],
-        bytebuddy: '1.9.10',
-        klaxon: '5.0.5',
-        typesafe: '1.3.3',
+        bytebuddy: '1.10.8',
+        klaxon: '5.2',
+        typesafe: '1.4.0',
         jgit: '4.9.0.201710071750-r',
         expekt: '0.5.0',
         junitrunner: '1.1.0-M1',
-        snakeyaml: '1.24',
+        snakeyaml: '1.26',
         jcommander: '1.72',
-        mockwebserver: '3.13.1',
-        aws: '1.11.510',
-        logging: '1.6.25',
+        mockwebserver: '4.4.1',
+        aws: '1.11.745',
+        logging: '1.7.8',
         mockk: '1.9.3',
-        kotlintest: '3.3.1',
+        kotlintest: '3.4.2',
         assertk: '0.13'
 ]