diff --git a/README.md b/README.md
index 963261e..e00da0b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ repositories {
 }
 
 dependencies {
-    api("org.radarbase:radar-jersey:0.2.2")
+    api("org.radarbase:radar-jersey:0.2.2.1")
 }
 ```
 
diff --git a/build.gradle b/build.gradle
index d9f149b..0e3b0a8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
 
 description = 'Library for Jersey authorization, exception handling and configuration with the RADAR platform'
 group = 'org.radarbase'
-version = '0.2.2'
+version = '0.2.2.1'
 
 ext {
     githubRepoName = 'RADAR-base/radar-jersey'
@@ -52,7 +52,7 @@ dependencies {
 
     runtimeOnly("org.glassfish.jersey.media:jersey-media-json-jackson:$jerseyVersion")
 
-    runtimeOnly("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion")
     runtimeOnly("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:$jacksonVersion")
     runtimeOnly("com.fasterxml.jackson.datatype:jackson-datatype-jdk8:$jacksonVersion")
 
diff --git a/src/main/kotlin/org/radarbase/jersey/config/ConfigLoader.kt b/src/main/kotlin/org/radarbase/jersey/config/ConfigLoader.kt
index 2d95248..b53a8fd 100644
--- a/src/main/kotlin/org/radarbase/jersey/config/ConfigLoader.kt
+++ b/src/main/kotlin/org/radarbase/jersey/config/ConfigLoader.kt
@@ -2,6 +2,7 @@ package org.radarbase.jersey.config
 
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
+import com.fasterxml.jackson.module.kotlin.KotlinModule
 import org.glassfish.jersey.internal.inject.AbstractBinder
 import org.glassfish.jersey.server.ResourceConfig
 import org.radarbase.jersey.auth.AuthConfig
@@ -33,7 +34,8 @@ object ConfigLoader {
         return createResourceConfig(enhancerFactory.createEnhancers())
     }
 
-    fun <T> loadConfig(fileName: String, args: Array<String>, clazz: Class<T>): T {
+    @JvmOverloads
+    fun <T> loadConfig(fileName: String, args: Array<String>, clazz: Class<T>, mapper: ObjectMapper? = null): T {
         val configFileName = when {
             args.size == 1 -> args[0]
             Files.exists(Paths.get(fileName)) -> fileName
@@ -44,8 +46,9 @@ object ConfigLoader {
         val configFile = File(configFileName)
         logger.info("Reading configuration from ${configFile.absolutePath}")
         try {
-            val mapper = ObjectMapper(YAMLFactory())
-            return mapper.readValue(configFile, clazz)
+            val localMapper = mapper ?: ObjectMapper(YAMLFactory())
+                    .registerModule(KotlinModule())
+            return localMapper.readValue(configFile, clazz)
         } catch (ex: IOException) {
             logger.error("Usage: <command> [$fileName]")
             logger.error("Failed to read config file $configFile: ${ex.message}")
@@ -59,8 +62,8 @@ object ConfigLoader {
      *
      * @throws IllegalArgumentException if a file matching configFileName cannot be found
      */
-    inline fun <reified T> loadConfig(fileName: String, args: Array<String>): T =
-        loadConfig(fileName, args, T::class.java)
+    inline fun <reified T> loadConfig(fileName: String, args: Array<String>, mapper: ObjectMapper? = null): T =
+        loadConfig(fileName, args, T::class.java, mapper)
 
     /**
      * Create a resourceConfig based on the provided resource enhancers. This method also disables