diff --git a/package.json b/package.json
index 3875f56f4..9543c37e5 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@snapshot-labs/snapshot.js",
-  "version": "0.3.87",
+  "version": "0.3.88",
   "repository": "snapshot-labs/snapshot.js",
   "license": "MIT",
   "main": "dist/snapshot.cjs.js",
diff --git a/src/schemas/space.json b/src/schemas/space.json
index d6064af5c..26ee18bdb 100644
--- a/src/schemas/space.json
+++ b/src/schemas/space.json
@@ -123,7 +123,8 @@
             "minLength": 42,
             "maxLength": 42
           },
-          "title": "members"
+          "title": "members",
+          "uniqueItems": true
         },
         "admins": {
           "type": "array",
@@ -134,7 +135,8 @@
             "minLength": 42,
             "maxLength": 42
           },
-          "title": "admins"
+          "title": "admins",
+          "uniqueItems": true
         },
         "filters": {
           "type": "object",