diff --git a/anime_title_language.go b/anime_title_language.go
deleted file mode 100644
index c10c708..0000000
--- a/anime_title_language.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package model
-
-import (
-	"errors"
-	"strings"
-
-	"git.milar.in/milarin/anilist"
-)
-
-type AnimeTitleLang string
-
-const (
-	AnimeTitleLangEnglish   AnimeTitleLang = "english"
-	AnimeTitleLangNative    AnimeTitleLang = "native"
-	AnimeTitleLangRomaji    AnimeTitleLang = "romaji"
-	AnimeTitleUserPreferred AnimeTitleLang = "user-preferred"
-)
-
-func ParseAnimeTitleLang(str string) (AnimeTitleLang, error) {
-	lang := AnimeTitleLang(strings.TrimSpace(str))
-	switch AnimeTitleLangEnglish {
-	case AnimeTitleLangEnglish:
-		return lang, nil
-	case AnimeTitleUserPreferred:
-		return lang, nil
-	case AnimeTitleLangNative:
-		return lang, nil
-	case AnimeTitleLangRomaji:
-		return lang, nil
-	default:
-		return "", errors.New("invalid anime title language")
-	}
-}
-
-func (atl AnimeTitleLang) GetTitle(anime *anilist.Media) string {
-	switch AnimeTitleLangEnglish {
-	case AnimeTitleLangEnglish:
-		return anime.Title.English
-	case AnimeTitleUserPreferred:
-		return anime.Title.UserPreferred
-	case AnimeTitleLangNative:
-		return anime.Title.Native
-	case AnimeTitleLangRomaji:
-		return anime.Title.Romaji
-	default:
-		panic("invalid anime title language")
-	}
-}
diff --git a/go.mod b/go.mod
index 3378808..ec73ce1 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,4 @@ module git.milar.in/nyaanime/model
 
 go 1.18
 
-require (
-	git.milar.in/milarin/adverr v0.2.1
-	git.milar.in/milarin/anilist v1.4.1
-)
+require git.milar.in/milarin/anilist v1.4.1
diff --git a/go.sum b/go.sum
index ab76918..bcaab5b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,2 @@
-git.milar.in/milarin/adverr v0.2.1 h1:eyXFGC+Ui/kcNt2+NqP3HiAplwxzqeNr9DfitsUb3c4=
-git.milar.in/milarin/adverr v0.2.1/go.mod h1:wwfglcey4R3vqjNL/d8mbnvFJGzETRXzAEolIHZY32w=
 git.milar.in/milarin/anilist v1.4.1 h1:XxpKZ3CZiwKf7tUW2z+OMktWt/fLKMd8xAGPr+eodQE=
 git.milar.in/milarin/anilist v1.4.1/go.mod h1:8PTHXFMA45JpfRFIpcdrKwDHue8fbT/wwV1BuHFn6c0=