diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/DeleteMyCommands.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/DeleteMyCommands.kt
index 3995e5384a..c7a447c65b 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/DeleteMyCommands.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/DeleteMyCommands.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.DeleteMyCommands
 import dev.inmo.tgbotapi.types.commands.BotCommandScope
@@ -8,10 +8,10 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.deleteMyCommands(
     scope: BotCommandScope = BotCommandScopeDefault,
-    languageCode: IetfLanguageCode?
+    languageCode: IetfLang?
 ) = execute(DeleteMyCommands(scope, languageCode))
 
 suspend fun TelegramBot.deleteMyCommands(
     scope: BotCommandScope = BotCommandScopeDefault,
     languageCode: String? = null
-) = deleteMyCommands(scope, languageCode ?.let(::IetfLanguageCode))
+) = deleteMyCommands(scope, languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyCommands.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyCommands.kt
index 9fe8119ea6..cbb4283076 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyCommands.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyCommands.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.types.commands.BotCommandScope
@@ -8,10 +8,10 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.getMyCommands(
     scope: BotCommandScope = BotCommandScopeDefault,
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(GetMyCommands(scope, languageCode))
 
 suspend fun TelegramBot.getMyCommands(
     scope: BotCommandScope = BotCommandScopeDefault,
     languageCode: String?
-) = getMyCommands(scope, languageCode ?.let(::IetfLanguageCode))
+) = getMyCommands(scope, languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyDescription.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyDescription.kt
index acb3288ed2..cf551df0d2 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyDescription.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyDescription.kt
@@ -1,16 +1,13 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
-import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.requests.bot.GetMyDescription
-import dev.inmo.tgbotapi.types.commands.BotCommandScope
-import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.getMyDescription(
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(GetMyDescription(languageCode))
 
 suspend fun TelegramBot.getMyDescription(
     languageCode: String?
-) = getMyDescription(languageCode ?.let(::IetfLanguageCode))
+) = getMyDescription(languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyName.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyName.kt
index 7db1ff1716..4783234dd9 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyName.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyName.kt
@@ -1,16 +1,13 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
-import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.requests.bot.GetMyName
-import dev.inmo.tgbotapi.types.commands.BotCommandScope
-import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.getMyName(
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(GetMyName(languageCode))
 
 suspend fun TelegramBot.getMyName(
     languageCode: String?
-) = getMyName(languageCode ?.let(::IetfLanguageCode))
+) = getMyName(languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyShortDescription.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyShortDescription.kt
index bfebfef460..32dc212ec3 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyShortDescription.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/GetMyShortDescription.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.requests.bot.GetMyShortDescription
@@ -8,9 +8,9 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScope
 import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.getMyShortDescription(
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(GetMyShortDescription(languageCode))
 
 suspend fun TelegramBot.getMyShortDescription(
     languageCode: String?
-) = getMyShortDescription(languageCode ?.let(::IetfLanguageCode))
+) = getMyShortDescription(languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyCommands.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyCommands.kt
index e7f5ef01bc..ec67a624c8 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyCommands.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyCommands.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.SetMyCommands
 import dev.inmo.tgbotapi.types.BotCommand
@@ -10,20 +10,20 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 suspend fun TelegramBot.setMyCommands(
     commands: List<BotCommand>,
     scope: BotCommandScope = BotCommandScopeDefault,
-    languageCode: IetfLanguageCode?
+    languageCode: IetfLang?
 ) = execute(SetMyCommands(commands, scope, languageCode))
 
 suspend fun TelegramBot.setMyCommands(
     vararg commands: BotCommand,
     scope: BotCommandScope = BotCommandScopeDefault,
-    languageCode: IetfLanguageCode?
+    languageCode: IetfLang?
 ) = setMyCommands(commands.toList(), scope, languageCode)
 
 suspend fun TelegramBot.setMyCommands(
     commands: List<BotCommand>,
     scope: BotCommandScope = BotCommandScopeDefault,
     languageCode: String? = null
-) = setMyCommands(commands, scope, languageCode ?.let(::IetfLanguageCode))
+) = setMyCommands(commands, scope, languageCode ?.let(::IetfLang))
 
 suspend fun TelegramBot.setMyCommands(
     vararg commands: BotCommand,
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyDescription.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyDescription.kt
index 370ca5a9a7..11f23cb34c 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyDescription.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyDescription.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.requests.bot.GetMyDescription
@@ -10,10 +10,10 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.setMyDescription(
     description: String? = null,
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(SetMyDescription(description, languageCode))
 
 suspend fun TelegramBot.setMyDescription(
     description: String?,
     languageCode: String?
-) = setMyDescription(description, languageCode ?.let(::IetfLanguageCode))
+) = setMyDescription(description, languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyName.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyName.kt
index 3af8abcbda..7e727c1fc4 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyName.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyName.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.GetMyCommands
 import dev.inmo.tgbotapi.requests.bot.GetMyName
@@ -10,10 +10,10 @@ import dev.inmo.tgbotapi.types.commands.BotCommandScopeDefault
 
 suspend fun TelegramBot.setMyName(
     name: String? = null,
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(SetMyName(name, languageCode))
 
 suspend fun TelegramBot.setMyName(
     name: String?,
     languageCode: String?
-) = setMyName(name, languageCode ?.let(::IetfLanguageCode))
+) = setMyName(name, languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyShortDescription.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyShortDescription.kt
index 2fcc869793..9431090b54 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyShortDescription.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/bot/SetMyShortDescription.kt
@@ -1,15 +1,15 @@
 package dev.inmo.tgbotapi.extensions.api.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.bot.TelegramBot
 import dev.inmo.tgbotapi.requests.bot.SetMyShortDescription
 
 suspend fun TelegramBot.setMyShortDescription(
     shortDescription: String? = null,
-    languageCode: IetfLanguageCode? = null
+    languageCode: IetfLang? = null
 ) = execute(SetMyShortDescription(shortDescription, languageCode))
 
 suspend fun TelegramBot.setMyShortDescription(
     shortDescription: String?,
     languageCode: String?
-) = setMyShortDescription(shortDescription, languageCode ?.let(::IetfLanguageCode))
+) = setMyShortDescription(shortDescription, languageCode ?.let(::IetfLang))
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/DeleteMyCommands.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/DeleteMyCommands.kt
index cdea8f87b8..ec4e573c6d 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/DeleteMyCommands.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/DeleteMyCommands.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.types.commands.*
 import dev.inmo.tgbotapi.types.languageCodeField
 import dev.inmo.tgbotapi.types.scopeField
@@ -14,8 +15,8 @@ data class DeleteMyCommands(
     @Serializable(BotCommandScopeSerializer::class)
     override val scope: BotCommandScope = BotCommandScopeDefault,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : MyCommandsRequest<Boolean> {
     override fun method(): String  = "deleteMyCommands"
     override val requestSerializer: SerializationStrategy<DeleteMyCommands>
@@ -28,7 +29,7 @@ data class DeleteMyCommands(
         languageCode: String?
     ) : this(
         scope,
-        languageCode ?.let(::IetfLanguageCode)
+        languageCode ?.let(::IetfLang)
     )
 
     companion object : MyCommandsRequest<Boolean> by DeleteMyCommands()
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyCommands.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyCommands.kt
index 511fc9e33f..d3e617c06c 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyCommands.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyCommands.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.commands.*
 import kotlinx.serialization.*
@@ -15,8 +16,8 @@ data class GetMyCommands(
     @Serializable(BotCommandScopeSerializer::class)
     override val scope: BotCommandScope = BotCommandScopeDefault,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : MyCommandsRequest<List<BotCommand>> {
     override fun method(): String = "getMyCommands"
     override val resultDeserializer: DeserializationStrategy<List<BotCommand>>
@@ -29,7 +30,7 @@ data class GetMyCommands(
         languageCode: String?
     ) : this(
         scope,
-        languageCode ?.let(::IetfLanguageCode)
+        languageCode ?.let(::IetfLang)
     )
 
     companion object : MyCommandsRequest<List<BotCommand>> by GetMyCommands()
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyDescription.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyDescription.kt
index fc971d3ea2..6edf46c4d7 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyDescription.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyDescription.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -12,8 +13,8 @@ import kotlinx.serialization.builtins.serializer
 @Serializable
 class GetMyDescription(
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<BotDescription>, WithOptionalLanguageCode {
     override fun method(): String = "getMyDescription"
     override val resultDeserializer: DeserializationStrategy<BotDescription>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyName.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyName.kt
index 94c606ef2b..ad5c7709a4 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyName.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyName.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -12,8 +13,8 @@ import kotlinx.serialization.builtins.serializer
 @Serializable
 class GetMyName(
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<BotName>, WithOptionalLanguageCode {
     override fun method(): String = "getMyName"
     override val resultDeserializer: DeserializationStrategy<BotName>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyShortDescription.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyShortDescription.kt
index c12ff05551..78c65802aa 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyShortDescription.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/GetMyShortDescription.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -12,8 +13,8 @@ import kotlinx.serialization.builtins.serializer
 @Serializable
 class GetMyShortDescription(
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<BotShortDescription>, WithOptionalLanguageCode {
     override fun method(): String = "getMyShortDescription"
     override val resultDeserializer: DeserializationStrategy<BotShortDescription>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyCommands.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyCommands.kt
index 6df10c13b1..10d75b5a52 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyCommands.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyCommands.kt
@@ -1,7 +1,8 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
+
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.commands.*
 import kotlinx.serialization.*
@@ -15,8 +16,8 @@ class SetMyCommands(
     @Serializable(BotCommandScopeSerializer::class)
     override val scope: BotCommandScope = BotCommandScopeDefault,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : MyCommandsRequest<Boolean> {
     override fun method(): String = "setMyCommands"
     override val resultDeserializer: DeserializationStrategy<Boolean>
@@ -31,7 +32,7 @@ class SetMyCommands(
     ) : this(
         commands,
         scope,
-        languageCode ?.let(::IetfLanguageCode)
+        languageCode ?.let(::IetfLang)
     )
 
     init {
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyDescription.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyDescription.kt
index f0ce0520c9..5e1e8d893f 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyDescription.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyDescription.kt
@@ -1,7 +1,7 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -14,8 +14,8 @@ class SetMyDescription(
     @SerialName(descriptionField)
     val description: String? = null,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<Boolean>, WithOptionalLanguageCode {
     override fun method(): String = "setMyDescription"
     override val resultDeserializer: DeserializationStrategy<Boolean>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyName.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyName.kt
index f1d867dd5e..9d0a90524b 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyName.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyName.kt
@@ -1,7 +1,7 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -14,8 +14,8 @@ class SetMyName(
     @SerialName(nameField)
     val name: String? = null,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<Boolean>, WithOptionalLanguageCode {
     override fun method(): String = "setMyName"
     override val resultDeserializer: DeserializationStrategy<Boolean>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyShortDescription.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyShortDescription.kt
index 1a11061860..cda3e11875 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyShortDescription.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/bot/SetMyShortDescription.kt
@@ -1,7 +1,7 @@
 package dev.inmo.tgbotapi.requests.bot
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
@@ -14,8 +14,8 @@ class SetMyShortDescription(
     @SerialName(shortDescriptionField)
     val shortDescription: String? = null,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null
 ) : SimpleRequest<Boolean>, WithOptionalLanguageCode {
     override fun method(): String = "setMyShortDescription"
     override val resultDeserializer: DeserializationStrategy<Boolean>
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/abstracts/WithOptionalLanguageCode.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/abstracts/WithOptionalLanguageCode.kt
index 125cb17826..588243fac3 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/abstracts/WithOptionalLanguageCode.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/abstracts/WithOptionalLanguageCode.kt
@@ -1,9 +1,9 @@
 package dev.inmo.tgbotapi.types.abstracts
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 
 interface WithOptionalLanguageCode {
-    val ietfLanguageCode: IetfLanguageCode?
+    val ietfLanguageCode: IetfLang?
 
     val languageCode: String?
         get() = ietfLanguageCode ?.code
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Impls.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Impls.kt
index 7588c3f55d..70ce032703 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Impls.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/chat/Impls.kt
@@ -1,7 +1,7 @@
 package dev.inmo.tgbotapi.types.chat
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
-import dev.inmo.micro_utils.language_codes.IetfLanguageCodeSerializer
+import dev.inmo.micro_utils.language_codes.IetfLang
+import dev.inmo.micro_utils.language_codes.IetfLangSerializer
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
 import dev.inmo.tgbotapi.utils.RiskFeature
@@ -99,8 +99,8 @@ data class CommonUser(
     @SerialName(usernameField)
     override val username: Username? = null,
     @SerialName(languageCodeField)
-    @Serializable(IetfLanguageCodeSerializer::class)
-    override val ietfLanguageCode: IetfLanguageCode? = null,
+    @Serializable(IetfLangSerializer::class)
+    override val ietfLanguageCode: IetfLang? = null,
     @SerialName(isPremiumField)
     override val isPremium: Boolean = false,
     @SerialName(addedToAttachmentMenuField)
@@ -112,5 +112,5 @@ data class CommonUser(
         lastName: String = "",
         username: Username? = null,
         languageCode: String
-    ) : this(id, firstName, lastName, username, IetfLanguageCode(languageCode))
+    ) : this(id, firstName, lastName, username, IetfLang(languageCode))
 }
diff --git a/tgbotapi.core/src/jvmMain/kotlin/dev/inmo/tgbotapi/types/UserLocale.kt b/tgbotapi.core/src/jvmMain/kotlin/dev/inmo/tgbotapi/types/UserLocale.kt
index 007efedfd0..bb8a49b824 100644
--- a/tgbotapi.core/src/jvmMain/kotlin/dev/inmo/tgbotapi/types/UserLocale.kt
+++ b/tgbotapi.core/src/jvmMain/kotlin/dev/inmo/tgbotapi/types/UserLocale.kt
@@ -1,8 +1,8 @@
 package dev.inmo.tgbotapi.types
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.types.abstracts.WithOptionalLanguageCode
 import java.util.*
 
-fun IetfLanguageCode?.javaLocale() = this ?.code ?.let { Locale.forLanguageTag(it) }
+fun IetfLang?.javaLocale() = this ?.code ?.let { Locale.forLanguageTag(it) }
 fun WithOptionalLanguageCode?.javaLocale() = this ?.ietfLanguageCode ?.javaLocale()
diff --git a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppUser.kt b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppUser.kt
index 75a018e789..46d834af4c 100644
--- a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppUser.kt
+++ b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppUser.kt
@@ -1,6 +1,6 @@
 package dev.inmo.tgbotapi.webapps
 
-import dev.inmo.micro_utils.language_codes.IetfLanguageCode
+import dev.inmo.micro_utils.language_codes.IetfLang
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.chat.CommonBot
 import dev.inmo.tgbotapi.types.chat.CommonUser
@@ -42,7 +42,7 @@ fun WebAppUser.asUser() = if (isBot == true) {
         firstName = firstName,
         lastName = lastName ?: "",
         username = username ?.let(::Username),
-        ietfLanguageCode = languageCode ?.let(::IetfLanguageCode),
+        ietfLanguageCode = languageCode ?.let(::IetfLang),
         isPremium = isPremium
     )
 }