diff --git a/deny.toml b/deny.toml
index c5d2843d3..cdd505084 100644
--- a/deny.toml
+++ b/deny.toml
@@ -8,3 +8,12 @@ private = { ignore = true }
 name = "ring"
 expression = "ISC AND MIT AND OpenSSL"
 license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]
+
+[advisories]
+ignore = [
+    # Unsoundness in chrono, via rcgen, exposed by concurrent access
+    # to environment variables. rcgen is only used in example/test
+    # code, so this is not a genuine security hazard. Remove once
+    # https://github.com/qnighy/yasna.rs/issues/63 is resolved.
+    "RUSTSEC-2020-0159"
+]