diff --git a/rubygems/versions.json b/rubygems/versions.json
index d3bc3aa..d863299 100644
--- a/rubygems/versions.json
+++ b/rubygems/versions.json
@@ -495,13 +495,17 @@
     "3.5.20": {
       "url": "https://github.com/rubygems/rubygems/archive/refs/tags/v3.5.20.tar.gz",
       "hash": "sha256-4wUmznrMiQW8gxzRGsFcJ4t/KBlIDw9GzgWyibXHRLQ="
+    },
+    "3.5.21": {
+      "url": "https://github.com/rubygems/rubygems/archive/refs/tags/v3.5.21.tar.gz",
+      "hash": "sha256-1x0BinF8ft+CeCOm65rBTJLn+ZiUp0nBy+oMZp3bjhg="
     }
   },
   "aliases": {
     "1": "1.8.30",
     "2": "2.7.6",
-    "3": "3.5.20",
-    "3.5": "3.5.20",
+    "3": "3.5.21",
+    "3.5": "3.5.21",
     "3.4": "3.4.22",
     "3.3": "3.3.27",
     "3.2": "3.2.34",
@@ -512,7 +516,7 @@
     "2.2": "2.2.3",
     "2.0": "2.0.15",
     "1.8": "1.8.30",
-    "3_5": "3.5.20",
+    "3_5": "3.5.21",
     "3_4": "3.4.22",
     "3_3": "3.3.27",
     "3_2": "3.2.34",