diff --git a/api/docker-kotlin.klib.api b/api/docker-kotlin.klib.api
index fafa4400..d7fbea65 100644
--- a/api/docker-kotlin.klib.api
+++ b/api/docker-kotlin.klib.api
@@ -280,7 +280,7 @@ final class me.devnatan.dockerkt.models.container/ContainerArchiveInfo { // me.d
 }
 
 final class me.devnatan.dockerkt.models.container/ContainerConfig { // me.devnatan.dockerkt.models.container/ContainerConfig|null[0]
-    constructor <init>(kotlin/String? = ..., kotlin/String? = ..., kotlin/String? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<me.devnatan.dockerkt.models/ExposedPort>? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/List<kotlin/String> = ..., me.devnatan.dockerkt.models/HealthConfig? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/Map<kotlin/String, kotlin/String> = ..., kotlin/String? = ..., kotlin/Int? = ..., kotlin.collections/List<kotlin/String> = ...) // me.devnatan.dockerkt.models.container/ContainerConfig.<init>|<init>(kotlin.String?;kotlin.String?;kotlin.String?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<me.devnatan.dockerkt.models.ExposedPort>?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<kotlin.String>?;kotlin.collections.List<kotlin.String>;me.devnatan.dockerkt.models.HealthConfig?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.collections.Map<kotlin.String,kotlin.String>;kotlin.String?;kotlin.Int?;kotlin.collections.List<kotlin.String>){}[0]
+    constructor <init>(kotlin/String? = ..., kotlin/String? = ..., kotlin/String? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<me.devnatan.dockerkt.models/ExposedPort>? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/List<kotlin/String>? = ..., me.devnatan.dockerkt.models/HealthConfig? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/Map<kotlin/String, kotlin/String> = ..., kotlin/String? = ..., kotlin/Int? = ..., kotlin.collections/List<kotlin/String> = ...) // me.devnatan.dockerkt.models.container/ContainerConfig.<init>|<init>(kotlin.String?;kotlin.String?;kotlin.String?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<me.devnatan.dockerkt.models.ExposedPort>?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<kotlin.String>?;kotlin.collections.List<kotlin.String>?;me.devnatan.dockerkt.models.HealthConfig?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.collections.Map<kotlin.String,kotlin.String>;kotlin.String?;kotlin.Int?;kotlin.collections.List<kotlin.String>){}[0]
 
     final val argsEscaped // me.devnatan.dockerkt.models.container/ContainerConfig.argsEscaped|{}argsEscaped[0]
         final fun <get-argsEscaped>(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.argsEscaped.<get-argsEscaped>|<get-argsEscaped>(){}[0]
@@ -291,7 +291,7 @@ final class me.devnatan.dockerkt.models.container/ContainerConfig { // me.devnat
     final val attachStdout // me.devnatan.dockerkt.models.container/ContainerConfig.attachStdout|{}attachStdout[0]
         final fun <get-attachStdout>(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.attachStdout.<get-attachStdout>|<get-attachStdout>(){}[0]
     final val command // me.devnatan.dockerkt.models.container/ContainerConfig.command|{}command[0]
-        final fun <get-command>(): kotlin.collections/List<kotlin/String> // me.devnatan.dockerkt.models.container/ContainerConfig.command.<get-command>|<get-command>(){}[0]
+        final fun <get-command>(): kotlin.collections/List<kotlin/String>? // me.devnatan.dockerkt.models.container/ContainerConfig.command.<get-command>|<get-command>(){}[0]
     final val domainname // me.devnatan.dockerkt.models.container/ContainerConfig.domainname|{}domainname[0]
         final fun <get-domainname>(): kotlin/String? // me.devnatan.dockerkt.models.container/ContainerConfig.domainname.<get-domainname>|<get-domainname>(){}[0]
     final val entrypoint // me.devnatan.dockerkt.models.container/ContainerConfig.entrypoint|{}entrypoint[0]
@@ -336,7 +336,7 @@ final class me.devnatan.dockerkt.models.container/ContainerConfig { // me.devnat
     final fun component1(): kotlin/String? // me.devnatan.dockerkt.models.container/ContainerConfig.component1|component1(){}[0]
     final fun component10(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.component10|component10(){}[0]
     final fun component11(): kotlin.collections/List<kotlin/String>? // me.devnatan.dockerkt.models.container/ContainerConfig.component11|component11(){}[0]
-    final fun component12(): kotlin.collections/List<kotlin/String> // me.devnatan.dockerkt.models.container/ContainerConfig.component12|component12(){}[0]
+    final fun component12(): kotlin.collections/List<kotlin/String>? // me.devnatan.dockerkt.models.container/ContainerConfig.component12|component12(){}[0]
     final fun component13(): me.devnatan.dockerkt.models/HealthConfig? // me.devnatan.dockerkt.models.container/ContainerConfig.component13|component13(){}[0]
     final fun component14(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.component14|component14(){}[0]
     final fun component15(): kotlin/String? // me.devnatan.dockerkt.models.container/ContainerConfig.component15|component15(){}[0]
@@ -358,7 +358,7 @@ final class me.devnatan.dockerkt.models.container/ContainerConfig { // me.devnat
     final fun component7(): kotlin.collections/List<me.devnatan.dockerkt.models/ExposedPort>? // me.devnatan.dockerkt.models.container/ContainerConfig.component7|component7(){}[0]
     final fun component8(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.component8|component8(){}[0]
     final fun component9(): kotlin/Boolean? // me.devnatan.dockerkt.models.container/ContainerConfig.component9|component9(){}[0]
-    final fun copy(kotlin/String? = ..., kotlin/String? = ..., kotlin/String? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<me.devnatan.dockerkt.models/ExposedPort>? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/List<kotlin/String> = ..., me.devnatan.dockerkt.models/HealthConfig? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/Map<kotlin/String, kotlin/String> = ..., kotlin/String? = ..., kotlin/Int? = ..., kotlin.collections/List<kotlin/String> = ...): me.devnatan.dockerkt.models.container/ContainerConfig // me.devnatan.dockerkt.models.container/ContainerConfig.copy|copy(kotlin.String?;kotlin.String?;kotlin.String?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<me.devnatan.dockerkt.models.ExposedPort>?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<kotlin.String>?;kotlin.collections.List<kotlin.String>;me.devnatan.dockerkt.models.HealthConfig?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.collections.Map<kotlin.String,kotlin.String>;kotlin.String?;kotlin.Int?;kotlin.collections.List<kotlin.String>){}[0]
+    final fun copy(kotlin/String? = ..., kotlin/String? = ..., kotlin/String? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<me.devnatan.dockerkt.models/ExposedPort>? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin/Boolean? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/List<kotlin/String>? = ..., me.devnatan.dockerkt.models/HealthConfig? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin/Boolean? = ..., kotlin/String? = ..., kotlin.collections/List<kotlin/String>? = ..., kotlin.collections/Map<kotlin/String, kotlin/String> = ..., kotlin/String? = ..., kotlin/Int? = ..., kotlin.collections/List<kotlin/String> = ...): me.devnatan.dockerkt.models.container/ContainerConfig // me.devnatan.dockerkt.models.container/ContainerConfig.copy|copy(kotlin.String?;kotlin.String?;kotlin.String?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<me.devnatan.dockerkt.models.ExposedPort>?;kotlin.Boolean?;kotlin.Boolean?;kotlin.Boolean?;kotlin.collections.List<kotlin.String>?;kotlin.collections.List<kotlin.String>?;me.devnatan.dockerkt.models.HealthConfig?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.Boolean?;kotlin.String?;kotlin.collections.List<kotlin.String>?;kotlin.collections.Map<kotlin.String,kotlin.String>;kotlin.String?;kotlin.Int?;kotlin.collections.List<kotlin.String>){}[0]
     final fun equals(kotlin/Any?): kotlin/Boolean // me.devnatan.dockerkt.models.container/ContainerConfig.equals|equals(kotlin.Any?){}[0]
     final fun hashCode(): kotlin/Int // me.devnatan.dockerkt.models.container/ContainerConfig.hashCode|hashCode(){}[0]
     final fun toString(): kotlin/String // me.devnatan.dockerkt.models.container/ContainerConfig.toString|toString(){}[0]
diff --git a/src/commonMain/kotlin/me/devnatan/dockerkt/models/container/ContainerConfig.kt b/src/commonMain/kotlin/me/devnatan/dockerkt/models/container/ContainerConfig.kt
index 663807b0..af162669 100644
--- a/src/commonMain/kotlin/me/devnatan/dockerkt/models/container/ContainerConfig.kt
+++ b/src/commonMain/kotlin/me/devnatan/dockerkt/models/container/ContainerConfig.kt
@@ -23,8 +23,8 @@ public data class ContainerConfig(
     @SerialName("Tty") public val tty: Boolean? = null,
     @SerialName("OpenStdin") public val openStdin: Boolean? = null,
     @SerialName("StdinOnce") public val stdinOnce: Boolean? = null,
-    @SerialName("Env") public val env: List<String>? = emptyList(),
-    @SerialName("Cmd") public val command: List<String> = emptyList(),
+    @SerialName("Env") public val env: List<String>? = null,
+    @SerialName("Cmd") public val command: List<String>? = null,
     @SerialName("Healthcheck") public val healthcheck: HealthConfig? = null,
     @SerialName("ArgsEscaped") public val argsEscaped: Boolean? = null,
     @SerialName("Image") public val image: String? = null,
diff --git a/src/commonTest/kotlin/me/devnatan/dockerkt/resource/container/InspectContainerIT.kt b/src/commonTest/kotlin/me/devnatan/dockerkt/resource/container/InspectContainerIT.kt
index 763b425a..b275235f 100644
--- a/src/commonTest/kotlin/me/devnatan/dockerkt/resource/container/InspectContainerIT.kt
+++ b/src/commonTest/kotlin/me/devnatan/dockerkt/resource/container/InspectContainerIT.kt
@@ -10,26 +10,22 @@ import me.devnatan.dockerkt.resource.ResourceIT
 import me.devnatan.dockerkt.withContainer
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertNull
 
 class InspectContainerIT : ResourceIT() {
     @Test
     fun `inspects container with volumes`() =
         runTest {
             testClient.withContainer(
-                "busybox:latest",
-                {
+                image = "busybox:latest",
+                options = {
                     volume("/opt")
                     keepStartedForever()
                 },
-            ) { id ->
-                testClient.containers.start(id)
-                try {
-                    val container = testClient.containers.inspect(id)
-                    val volumes = container.config.volumes
-                    assertEquals(volumes, listOf("/opt"))
-                } finally {
-                    testClient.containers.stop(id)
-                }
+            ) { containerId ->
+                val container = testClient.containers.inspect(containerId)
+                val volumes = container.config.volumes
+                assertEquals(volumes, listOf("/opt"))
             }
         }
 }
diff --git a/src/commonTest/kotlin/me/devnatan/dockerkt/util/JsonTest.kt b/src/commonTest/kotlin/me/devnatan/dockerkt/util/JsonTest.kt
deleted file mode 100644
index a90a1e01..00000000
--- a/src/commonTest/kotlin/me/devnatan/dockerkt/util/JsonTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package me.devnatan.dockerkt.util
-
-import kotlinx.serialization.SerialName
-import kotlinx.serialization.Serializable
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-class JsonTest {
-    @Test
-    fun `deserialization of nullable api field with default value`() {
-        @Serializable
-        data class Entity(
-            @SerialName("Cmd") val command: List<String> = emptyList(),
-        )
-
-        val json = """{"Cmd": null}"""
-        val entity = DockerKotlinJson.decodeFromString<Entity>(json)
-
-        assertEquals(
-            expected = Entity(command = emptyList()),
-            actual = entity,
-        )
-    }
-}