diff --git a/api/serializers/agreement_signature.py b/api/serializers/agreement_signature.py
index e750812..9113139 100644
--- a/api/serializers/agreement_signature.py
+++ b/api/serializers/agreement_signature.py
@@ -14,4 +14,4 @@ class AgreementSignatureSerializer(ModelSerializer[User, AgreementSignature]):
 
     class Meta:
         model = AgreementSignature
-        fields = "__all__"
+        fields = ["id", "contributor", "agreement_id", "signed_at"]
diff --git a/api/serializers/contributor.py b/api/serializers/contributor.py
index 4e2817c..bd47679 100644
--- a/api/serializers/contributor.py
+++ b/api/serializers/contributor.py
@@ -13,4 +13,4 @@ class ContributorSerializer(ModelSerializer[User, Contributor]):
 
     class Meta:
         model = Contributor
-        fields = "__all__"
+        fields = ["id", "email", "name", "location", "html_url", "avatar_url"]