diff --git a/build.gradle.kts b/build.gradle.kts
index 2ee2e280..7f212a07 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -20,6 +20,10 @@ application {
     applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
 }
 
+tasks.withType<Test> {
+    useJUnitPlatform()
+}
+
 repositories {
     mavenCentral()
 }
@@ -54,6 +58,7 @@ dependencies {
     implementation("io.ktor:ktor-client-core:$ktor_version")
     implementation("io.ktor:ktor-client-cio:$ktor_version")
     implementation("io.ktor:ktor-client-content-negotiation:$ktor_version")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.8.1")
 }
 
 jib {
diff --git a/src/main/kotlin/dev/usbharu/hideout/ap/Follow.kt b/src/main/kotlin/dev/usbharu/hideout/ap/Follow.kt
index ef668610..b2ab16c6 100644
--- a/src/main/kotlin/dev/usbharu/hideout/ap/Follow.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/ap/Follow.kt
@@ -13,4 +13,6 @@ open class Follow : Object{
         this.`object` = `object`
         this.actor = actor
     }
+
+
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/ap/JsonLd.kt b/src/main/kotlin/dev/usbharu/hideout/ap/JsonLd.kt
index 2cda262c..b4749c7b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/ap/JsonLd.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/ap/JsonLd.kt
@@ -5,12 +5,13 @@ import com.fasterxml.jackson.annotation.JsonCreator
 import com.fasterxml.jackson.annotation.JsonProperty
 import com.fasterxml.jackson.core.TreeNode
 import com.fasterxml.jackson.databind.JsonDeserializer
+import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize
 
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
 open class JsonLd {
     @JsonProperty("@context")
-    @JsonDeserialize(using = ContextDeserializer::class)
+    @JsonDeserialize(contentUsing = ContextDeserializer::class)
     var context:List<String> = emptyList()
 
     @JsonCreator
@@ -21,8 +22,12 @@ open class JsonLd {
     protected constructor()
 }
 
-public class ContextDeserializer : JsonDeserializer<List<String>>() {
-    override fun deserialize(p0: com.fasterxml.jackson.core.JsonParser?, p1: com.fasterxml.jackson.databind.DeserializationContext?): List<String> {
-        return emptyList()
+public class ContextDeserializer : JsonDeserializer<String>() {
+    override fun deserialize(p0: com.fasterxml.jackson.core.JsonParser?, p1: com.fasterxml.jackson.databind.DeserializationContext?): String {
+        val readTree : JsonNode  = p0?.codec?.readTree(p0) ?: return ""
+        if (readTree.isObject) {
+            return ""
+        }
+        return readTree.asText()
     }
 }
diff --git a/src/test/kotlin/dev/usbharu/hideout/ap/ContextDeserializerTest.kt b/src/test/kotlin/dev/usbharu/hideout/ap/ContextDeserializerTest.kt
new file mode 100644
index 00000000..a9b933c5
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/ap/ContextDeserializerTest.kt
@@ -0,0 +1,51 @@
+package dev.usbharu.hideout.ap
+
+import com.fasterxml.jackson.databind.DeserializationFeature
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import org.junit.jupiter.api.Assertions.*
+
+class ContextDeserializerTest {
+
+    @org.junit.jupiter.api.Test
+    fun deserialize() {
+        //language=JSON
+        val s = """
+            {
+  "@context": [
+    "https://www.w3.org/ns/activitystreams",
+    "https://w3id.org/security/v1",
+    {
+      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
+      "sensitive": "as:sensitive",
+      "Hashtag": "as:Hashtag",
+      "quoteUrl": "as:quoteUrl",
+      "toot": "http://joinmastodon.org/ns#",
+      "Emoji": "toot:Emoji",
+      "featured": "toot:featured",
+      "discoverable": "toot:discoverable",
+      "schema": "http://schema.org#",
+      "PropertyValue": "schema:PropertyValue",
+      "value": "schema:value",
+      "misskey": "https://misskey-hub.net/ns#",
+      "_misskey_content": "misskey:_misskey_content",
+      "_misskey_quote": "misskey:_misskey_quote",
+      "_misskey_reaction": "misskey:_misskey_reaction",
+      "_misskey_votes": "misskey:_misskey_votes",
+      "_misskey_talk": "misskey:_misskey_talk",
+      "isCat": "misskey:isCat",
+      "vcard": "http://www.w3.org/2006/vcard/ns#"
+    }
+  ],
+  "id": "https://test-misskey-v12.usbharu.dev/follows/9bg1zu54y7/9cydqvpjcn",
+  "type": "Follow",
+  "actor": "https://test-misskey-v12.usbharu.dev/users/9bg1zu54y7",
+  "object": "https://test-hideout.usbharu.dev/users/test3"
+}
+
+"""
+        val readValue = jacksonObjectMapper().enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY).configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false).readValue<Follow>(s)
+        println(readValue)
+        println(readValue.actor)
+    }
+}