diff --git a/pkgs/tools/system/at/default.nix b/pkgs/tools/system/at/default.nix
index 2964db34e124..1dc36043ea9e 100644
--- a/pkgs/tools/system/at/default.nix
+++ b/pkgs/tools/system/at/default.nix
@@ -1,12 +1,12 @@
 { fetchurl, stdenv, bison, flex, pam, ssmtp }:
 
 stdenv.mkDerivation {
-  name = "at-3.1.14";
+  name = "at-3.1.15";
 
   src = fetchurl {
     # Debian is apparently the last location where it can be found.
-    url = mirror://debian/pool/main/a/at/at_3.1.14.orig.tar.gz;
-    sha256 = "cd092bf05d29c25b286f55a960ce8b8c3c5beb571d86ed8eb1dfb3b61291b3ae";
+    url = mirror://debian/pool/main/a/at/at_3.1.15.orig.tar.gz;
+    sha256 = "1z7pgglr0zmwapb4sc1bdb3z0hgig1asyzqv4gs5xafmjd94za03";
   };
 
   patches = [ ./install.patch ];