diff --git a/pkgs/development/libraries/libngspice/default.nix b/pkgs/development/libraries/libngspice/default.nix
index 72fbcd1ab08..2f8aab830da 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 = "33";
+  version = "34";
 
   src = fetchurl {
     url = "mirror://sourceforge/ngspice/ngspice-${version}.tar.gz";
-    sha256 = "1wa1hmpn13spmxqgbb1m7vgy32mwvjqwrxhymzll8z65q5nbd7dr";
+    sha256 = "sha256-ImP//GaUdUlyr3By7wHP5irHkIANrWUbwpC/yueb17U=";
   };
 
   nativeBuildInputs = [ flex bison ];