diff --git a/pkgs/development/compilers/ecl/default.nix b/pkgs/development/compilers/ecl/default.nix
index 40690841965a..d2c26487c0f4 100644
--- a/pkgs/development/compilers/ecl/default.nix
+++ b/pkgs/development/compilers/ecl/default.nix
@@ -6,11 +6,11 @@ let
   s = # Generated upstream information
   rec {
     baseName="ecl";
-    version="12.12.1";
+    version="13.5.1";
     name="${baseName}-${version}";
-    hash="15y2dgj95li6mxiz9pnllj9x88km0z8gfh46kysfllkp2pl7rrsl";
-    url="mirror://sourceforge/project/ecls/ecls/12.12/ecl-12.12.1.tgz";
-    sha256="15y2dgj95li6mxiz9pnllj9x88km0z8gfh46kysfllkp2pl7rrsl";
+    hash="18ic8w9sdl0dh3kmyc9lsrafikrd9cg1jkhhr25p9saz0v75f77r";
+    url="mirror://sourceforge/project/ecls/ecls/13.5/ecl-13.5.1.tgz";
+    sha256="18ic8w9sdl0dh3kmyc9lsrafikrd9cg1jkhhr25p9saz0v75f77r";
   };
   buildInputs = [
     libffi