diff --git a/api/src/controllers/entries.ts b/api/src/controllers/entries.ts
index c6618283..b5546ca4 100644
--- a/api/src/controllers/entries.ts
+++ b/api/src/controllers/entries.ts
@@ -274,9 +274,12 @@ export const entriesH = new Elysia({ tags: ["series"] })
 				}),
 				after: t.Optional(t.String({ description: desc.after })),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Entry),
 				404: {
diff --git a/api/src/controllers/images.ts b/api/src/controllers/images.ts
index 865af6cc..170f4e2b 100644
--- a/api/src/controllers/images.ts
+++ b/api/src/controllers/images.ts
@@ -196,9 +196,12 @@ export const imagesH = new Elysia({ tags: ["images"] })
 		},
 	)
 	.guard({
-		headers: t.Object({
-			"accept-language": AcceptLanguage(),
-		}),
+		headers: t.Object(
+			{
+				"accept-language": AcceptLanguage(),
+			},
+			{ additionalProperties: true },
+		),
 	})
 	.get(
 		"/studios/:id/logo",
diff --git a/api/src/controllers/seasons.ts b/api/src/controllers/seasons.ts
index d4559727..1a28683b 100644
--- a/api/src/controllers/seasons.ts
+++ b/api/src/controllers/seasons.ts
@@ -128,9 +128,12 @@ export const seasonsH = new Elysia({ tags: ["series"] })
 				}),
 				after: t.Optional(t.String({ description: desc.after })),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Season),
 				404: {
diff --git a/api/src/controllers/shows/collections.ts b/api/src/controllers/shows/collections.ts
index cb5474e6..f2fd177a 100644
--- a/api/src/controllers/shows/collections.ts
+++ b/api/src/controllers/shows/collections.ts
@@ -87,9 +87,12 @@ export const collections = new Elysia({
 					description: "Include related resources in the response.",
 				}),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage(),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage(),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: { ...FullCollection, description: "Found" },
 				404: {
@@ -170,9 +173,12 @@ export const collections = new Elysia({
 					}),
 				),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Collection),
 				422: KError,
@@ -203,9 +209,12 @@ export const collections = new Elysia({
 				}),
 			),
 		}),
-		headers: t.Object({
-			"accept-language": AcceptLanguage({ autoFallback: true }),
-		}),
+		headers: t.Object(
+			{
+				"accept-language": AcceptLanguage({ autoFallback: true }),
+			},
+			{ additionalProperties: true },
+		),
 	})
 	.get(
 		"/:id/movies",
diff --git a/api/src/controllers/shows/movies.ts b/api/src/controllers/shows/movies.ts
index 829edc7a..2781d171 100644
--- a/api/src/controllers/shows/movies.ts
+++ b/api/src/controllers/shows/movies.ts
@@ -77,9 +77,12 @@ export const movies = new Elysia({ prefix: "/movies", tags: ["movies"] })
 					description: "Include related resources in the response.",
 				}),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage(),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage(),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: { ...FullMovie, description: "Found" },
 				404: {
@@ -160,9 +163,12 @@ export const movies = new Elysia({ prefix: "/movies", tags: ["movies"] })
 					}),
 				),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Movie),
 				422: KError,
diff --git a/api/src/controllers/shows/series.ts b/api/src/controllers/shows/series.ts
index c788efdd..cd7d3440 100644
--- a/api/src/controllers/shows/series.ts
+++ b/api/src/controllers/shows/series.ts
@@ -77,9 +77,12 @@ export const series = new Elysia({ prefix: "/series", tags: ["series"] })
 					description: "Include related resources in the response.",
 				}),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage(),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage(),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: { ...FullSerie, description: "Found" },
 				404: {
@@ -160,9 +163,12 @@ export const series = new Elysia({ prefix: "/series", tags: ["series"] })
 					}),
 				),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Serie),
 				422: KError,
diff --git a/api/src/controllers/shows/shows.ts b/api/src/controllers/shows/shows.ts
index 2b6e5f87..a61983fb 100644
--- a/api/src/controllers/shows/shows.ts
+++ b/api/src/controllers/shows/shows.ts
@@ -105,9 +105,12 @@ export const showsH = new Elysia({ prefix: "/shows", tags: ["shows"] })
 					}),
 				),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Show),
 				422: KError,
diff --git a/api/src/controllers/studios.ts b/api/src/controllers/studios.ts
index 65ce97e9..ba8a5290 100644
--- a/api/src/controllers/studios.ts
+++ b/api/src/controllers/studios.ts
@@ -175,9 +175,12 @@ export const studiosH = new Elysia({ prefix: "/studios", tags: ["studios"] })
 					description: "Include related resources in the response.",
 				}),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage(),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage(),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: "studio",
 				404: {
@@ -249,9 +252,12 @@ export const studiosH = new Elysia({ prefix: "/studios", tags: ["studios"] })
 				}),
 				after: t.Optional(t.String({ description: desc.after })),
 			}),
-			headers: t.Object({
-				"accept-language": AcceptLanguage({ autoFallback: true }),
-			}),
+			headers: t.Object(
+				{
+					"accept-language": AcceptLanguage({ autoFallback: true }),
+				},
+				{ additionalProperties: true },
+			),
 			response: {
 				200: Page(Studio),
 				422: KError,
@@ -282,9 +288,12 @@ export const studiosH = new Elysia({ prefix: "/studios", tags: ["studios"] })
 				}),
 			),
 		}),
-		headers: t.Object({
-			"accept-language": AcceptLanguage({ autoFallback: true }),
-		}),
+		headers: t.Object(
+			{
+				"accept-language": AcceptLanguage({ autoFallback: true }),
+			},
+			{ additionalProperties: true },
+		),
 	})
 	.get(
 		"/:id/shows",