diff --git a/pkgs/development/libraries/libngspice/default.nix b/pkgs/development/libraries/libngspice/default.nix
index e1b9e4f0bdc..84bd9b33e79 100644
--- a/pkgs/development/libraries/libngspice/default.nix
+++ b/pkgs/development/libraries/libngspice/default.nix
@@ -4,11 +4,11 @@
 # the ngspice derivation.
 stdenv.mkDerivation rec {
   pname = "libngspice";
-  version = "31";
+  version = "33";
 
   src = fetchurl {
     url = "mirror://sourceforge/ngspice/ngspice-${version}.tar.gz";
-    sha256 = "10n2lnfrpsv4vyrirkphr4jwjjhy7i617g6za78dwirfjq63npw4";
+    sha256 = "1wa1hmpn13spmxqgbb1m7vgy32mwvjqwrxhymzll8z65q5nbd7dr";
   };
 
   nativeBuildInputs = [ flex bison ];