diff --git a/rendercv/themes/classic/__init__.py b/rendercv/themes/classic/__init__.py
index 8127ce9..acd6042 100644
--- a/rendercv/themes/classic/__init__.py
+++ b/rendercv/themes/classic/__init__.py
@@ -128,6 +128,8 @@ class ClassicThemeMargins(pydantic.BaseModel):
 class ClassicThemeOptions(pydantic.BaseModel):
     """ """
 
+    model_config = pydantic.ConfigDict(extra="forbid")
+
     theme: Literal["classic"]
     font: Literal["SourceSans3", "Roboto", "EBGaramond"] = pydantic.Field(
         default="SourceSans3",
diff --git a/rendercv/themes/mcdowell/__init__.py b/rendercv/themes/mcdowell/__init__.py
index 3565000..8ada56c 100644
--- a/rendercv/themes/mcdowell/__init__.py
+++ b/rendercv/themes/mcdowell/__init__.py
@@ -13,4 +13,6 @@ LaTeXDimension = Annotated[
 class McdowellThemeOptions(pydantic.BaseModel):
     """ """
 
+    model_config = pydantic.ConfigDict(extra="forbid")
+
     theme: Literal["mcdowell"]
diff --git a/rendercv/themes/moderncv/__init__.py b/rendercv/themes/moderncv/__init__.py
index bf31997..9d49b69 100644
--- a/rendercv/themes/moderncv/__init__.py
+++ b/rendercv/themes/moderncv/__init__.py
@@ -14,6 +14,8 @@ LaTeXDimension = Annotated[
 class ModerncvThemeOptions(pydantic.BaseModel):
     """ """
 
+    model_config = pydantic.ConfigDict(extra="forbid")
+
     theme: Literal["moderncv"]
     font_size: Literal["10pt", "11pt", "12pt"] = pydantic.Field(
         default="10pt",