diff --git a/bundles/sshmon/files/check_https_certificate_at_url b/bundles/sshmon/files/check_https_certificate_at_url
index f494e37..e9fb507 100644
--- a/bundles/sshmon/files/check_https_certificate_at_url
+++ b/bundles/sshmon/files/check_https_certificate_at_url
@@ -21,7 +21,8 @@ case "$issuer_hash" in
     # 8d33f237: issuer=C = US, O = Let's Encrypt, CN = R3
     # 462422cf: issuer=C = US, O = Let's Encrypt, CN = E5
     # 9aad238c: issuer=C = US, O = Let's Encrypt, CN = E6
-    4f06f81d|8d33f237|462422cf|9aad238c)
+    # 31dfb39d: issuer=C = US, O = Let's Encrypt, CN = R11
+    4f06f81d|8d33f237|462422cf|9aad238c|31dfb39d)
         warn_days=10
         crit_days=3
         ;;