diff --git a/pkgs/tools/system/memtester/default.nix b/pkgs/tools/system/memtester/default.nix
index 276d4f446cfa..dfbaaffd8e85 100644
--- a/pkgs/tools/system/memtester/default.nix
+++ b/pkgs/tools/system/memtester/default.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   pname = "memtester";
-  version = "4.5.0";
+  version = "4.5.1";
 
   preConfigure = ''
     echo "$CC" > conf-cc
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "http://pyropus.ca/software/memtester/old-versions/memtester-${version}.tar.gz";
-    sha256 = "0dxfwayns3hjjplkxkpkm1409lmjlpi4chcrahcvdbnl0q6jpmcf";
+    sha256 = "sha256-HF/COCV2wISzFM/TNNEnpmwgvWOJLKyfRFvB2LTKWkc=";
   };
 
   installFlags = [ "INSTALLPATH=$(out)" ];