diff --git a/artifacts/src/main/resources/common/protocol-version-schema.json b/artifacts/src/main/resources/common/protocol-version-schema.json
index d513abb..eb3c23d 100644
--- a/artifacts/src/main/resources/common/protocol-version-schema.json
+++ b/artifacts/src/main/resources/common/protocol-version-schema.json
@@ -78,7 +78,9 @@
         },
         "profile": {
           "type": "array",
-          "items": "string"
+          "items": {
+            "type": "string"
+          }
         }
       },
       "required": [
diff --git a/artifacts/src/main/resources/negotiation/contract-schema.json b/artifacts/src/main/resources/negotiation/contract-schema.json
index c44257a..c3e07de 100644
--- a/artifacts/src/main/resources/negotiation/contract-schema.json
+++ b/artifacts/src/main/resources/negotiation/contract-schema.json
@@ -32,7 +32,9 @@
           "oneOf": [
             {
               "type": "array",
-              "items": "string"
+              "items": {
+                "type": "string"
+              }
             },
             {
               "type": "string"