diff --git a/.duplicate-id-guard b/.duplicate-id-guard
index 9fd120f..444662e 100644
--- a/.duplicate-id-guard
+++ b/.duplicate-id-guard
@@ -1,3 +1,3 @@
 This file causes merge conflicts if two ID assignment jobs run concurrently.
 This prevents duplicate ID assignment due to a race between those jobs.
-80b5a4b093d014fe17330b3a896a0f5b5f7423ad71441d444a4da919f633d640  -
+aca88be860a033f6f99bda0330d401dfe26e9f14790c9ab166b4bb63d4496fff  -
diff --git a/crates/nano_arena/RUSTSEC-0000-0000.md b/crates/nano_arena/RUSTSEC-2021-0031.md
similarity index 97%
rename from crates/nano_arena/RUSTSEC-0000-0000.md
rename to crates/nano_arena/RUSTSEC-2021-0031.md
index ef31691..5523947 100644
--- a/crates/nano_arena/RUSTSEC-0000-0000.md
+++ b/crates/nano_arena/RUSTSEC-2021-0031.md
@@ -1,6 +1,6 @@
 ```toml
 [advisory]
-id = "RUSTSEC-0000-0000"
+id = "RUSTSEC-2021-0031"
 package = "nano_arena"
 date = "2021-01-31"
 url = "https://github.com/bennetthardwick/nano-arena/issues/1"