diff --git a/.idea/modules/kotlin-unsigned.iml b/.idea/modules/kotlin-unsigned.iml
index 82f35f5..c9de21e 100644
--- a/.idea/modules/kotlin-unsigned.iml
+++ b/.idea/modules/kotlin-unsigned.iml
@@ -19,6 +19,7 @@
           <option name="pluginClasspaths">
             <array />
           </option>
+          <option name="coroutinesState" value="warn" />
         </compilerArguments>
       </configuration>
     </facet>
@@ -37,8 +38,8 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib:1.2.51" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.2.51" level="project" />
+    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib:1.2.60" level="project" />
+    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60" level="project" />
     <orderEntry type="library" name="Gradle: org.jetbrains:annotations:13.0" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: io.kotlintest:kotlintest-runner-junit5:3.1.0" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: io.kotlintest:kotlintest-runner-jvm:3.1.0" level="project" />
diff --git a/build.gradle b/build.gradle
index d4a26c1..f6aa5bc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ apply plugin: 'com.github.johnrengelman.shadow'
 
 buildscript {
 
-    ext.kotlinVersion = '1.2.51'
+    ext.kotlinVersion = '1.2.60'
 
     repositories {
         jcenter()   // shadow