diff --git a/pkgs/servers/squid/4.nix b/pkgs/servers/squid/4.nix
index f0429475be27..62f0b7c001b5 100644
--- a/pkgs/servers/squid/4.nix
+++ b/pkgs/servers/squid/4.nix
@@ -2,11 +2,11 @@
 , expat, libxml2, openssl }:
 
 stdenv.mkDerivation rec {
-  name = "squid-4.0.21";
+  name = "squid-4.0.23";
 
   src = fetchurl {
     url = "http://www.squid-cache.org/Versions/v4/${name}.tar.xz";
-    sha256 = "0cwfj3qpl72k5l1h2rvkv1xg0720rifk4wcvi49z216hznyqwk8m";
+    sha256 = "0a8g0zs3xayfkxl8maq823b14lckvh9d5lf7ryh9rx303xh1mdqq";
   };
 
   buildInputs = [