diff --git a/pkgs/development/libraries/cimg/default.nix b/pkgs/development/libraries/cimg/default.nix
index a647c84016b..5dece8328b4 100644
--- a/pkgs/development/libraries/cimg/default.nix
+++ b/pkgs/development/libraries/cimg/default.nix
@@ -3,11 +3,11 @@
 stdenv.mkDerivation rec {
 
   name = "cimg-${version}";
-  version = "2.5.5";
+  version = "2.5.6";
 
   src = fetchurl {
     url = "http://cimg.eu/files/CImg_${version}.zip";
-    sha256 = "12jwis90ijakfiqngcd8s4a22wzr32f6midszja9ry41ilv63nic";
+    sha256 = "02n3xjjs68xszvyk2830i03clbqlngnic0cw1rk6xca7gsvad3ij";
   };
 
   nativeBuildInputs = [ unzip ];