diff --git a/gradle.properties b/gradle.properties
index 93900c7..e1f83fe 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,11 +2,11 @@ kotlin.code.style=official
 org.gradle.parallel=true
 kotlin.incremental.multiplatform=true
 
-kotlin_version=1.4.30
-kotlin_serialisation_runtime_version=1.1.0
+kotlin_version=1.5.10
+kotlin_serialisation_runtime_version=1.2.1
 klassindex_version=4.1.0-rc.1
 
 github_release_plugin_version=2.2.12
 
 group=dev.inmo
-version=0.4.1
+version=0.5.0
diff --git a/src/commonMain/kotlin/dev/inmo/sdi/ModuleSerializer.kt b/src/commonMain/kotlin/dev/inmo/sdi/ModuleSerializer.kt
index 389081a..c22587f 100644
--- a/src/commonMain/kotlin/dev/inmo/sdi/ModuleSerializer.kt
+++ b/src/commonMain/kotlin/dev/inmo/sdi/ModuleSerializer.kt
@@ -94,7 +94,7 @@ internal data class SerializationContext(
 
 @Serializer(Module::class)
 class ModuleSerializer(
-    private val additionalClassesToInclude: Iterable<KClass<*>>,
+    private val additionalClassesToInclude: Iterable<KClass<*>> = emptyList(),
     private val moduleBuilder: (SerializersModuleBuilder.() -> Unit)? = null
 ) : KSerializer<Module> {
     constructor() : this(emptyList()) // to be able to create default instance