diff --git a/pkgs/servers/monitoring/nagios/plugins/check_ssl_cert.nix b/pkgs/servers/monitoring/nagios/plugins/check_ssl_cert.nix
index 80bb74c4c2d2..de64666ec770 100644
--- a/pkgs/servers/monitoring/nagios/plugins/check_ssl_cert.nix
+++ b/pkgs/servers/monitoring/nagios/plugins/check_ssl_cert.nix
@@ -10,13 +10,13 @@
 
 stdenv.mkDerivation rec {
   pname = "check_ssl_cert";
-  version = "2.20.0";
+  version = "2.21.0";
 
   src = fetchFromGitHub {
     owner = "matteocorti";
     repo = "check_ssl_cert";
     rev = "v${version}";
-    sha256 = "sha256-M2Iy4FrdNw2Qyep8hHswzUEI7HSvVCuZO8wnJ398MfU=";
+    sha256 = "sha256-tUmRWXdPu3nGj+dUBNvF7cRayMn8vCyA94vyUmQrfRk=";
   };
 
   nativeBuildInputs = [