diff --git a/pkgs/development/libraries/udunits/default.nix b/pkgs/development/libraries/udunits/default.nix
index b8ffc16f9052..b02ac8852371 100644
--- a/pkgs/development/libraries/udunits/default.nix
+++ b/pkgs/development/libraries/udunits/default.nix
@@ -3,10 +3,10 @@
 }:
 
 stdenv.mkDerivation rec {
-    name = "udunits-2.2.24";
+    name = "udunits-2.2.26";
     src = fetchurl {
         url = "ftp://ftp.unidata.ucar.edu/pub/udunits/${name}.tar.gz";
-        sha256 = "15bz2wv46wiwdzai8770gzy05prgj120x6j2hmihavv5y89cbfi0";
+        sha256 = "0v9mqw4drnkzkm57331ail6yvs9485jmi37s40lhvmf7r5lli3rn";
     };
 
     nativeBuildInputs = [ bison flex file ];