diff --git a/pkgs/servers/sql/mysql55/default.nix b/pkgs/servers/sql/mysql55/default.nix
index 6a824b4f51c..493f86f00f7 100644
--- a/pkgs/servers/sql/mysql55/default.nix
+++ b/pkgs/servers/sql/mysql55/default.nix
@@ -3,11 +3,11 @@
 # Note: zlib is not required; MySQL can use an internal zlib.
 
 stdenv.mkDerivation {
-  name = "mysql-5.5.15";
+  name = "mysql-5.5.20";
 
   src = fetchurl {
-    url = ftp://mirror.leaseweb.com/mysql/Downloads/MySQL-5.5/mysql-5.5.15.tar.gz;
-    sha256 = "10jwkkmp231swc986z01nsp0q67kp0zdkfb4q4v9if2vn6a51ldy";
+    url = ftp://mirror.leaseweb.com/mysql/Downloads/MySQL-5.5/mysql-5.5.20.tar.gz;
+    sha256 = "03jl60mzrsd1jb8fvkz6c8j2239b37k8n1i07jk1q4yk58aq8ynh";
   };
 
   buildInputs = [ cmake bison ncurses openssl readline zlib ];