diff --git a/crates/chrono/RUSTSEC-2020-0159.md b/crates/chrono/RUSTSEC-2020-0159.md
index 7ef2787..4e14e71 100644
--- a/crates/chrono/RUSTSEC-2020-0159.md
+++ b/crates/chrono/RUSTSEC-2020-0159.md
@@ -11,7 +11,7 @@ withdrawn = "2022-05-12" # see rustsec/advisory-db#1190
 yanked = true
 
 [versions]
-patched = []
+patched = [">=0.4.20"]
 ```
 
 # Potential segfault in `localtime_r` invocations