diff --git a/pkgs/development/libraries/gtksourceview/4.x.nix b/pkgs/development/libraries/gtksourceview/4.x.nix
index acfd2c48081e..3f0d2332519e 100644
--- a/pkgs/development/libraries/gtksourceview/4.x.nix
+++ b/pkgs/development/libraries/gtksourceview/4.x.nix
@@ -3,11 +3,11 @@
 
 stdenv.mkDerivation rec {
   name = "gtksourceview-${version}";
-  version = "4.0.3";
+  version = "4.2.0";
 
   src = fetchurl {
     url = "mirror://gnome/sources/gtksourceview/${stdenv.lib.versions.majorMinor version}/${name}.tar.xz";
-    sha256 = "0wwxgw43dmmaz07lzdzpladir26l2bly3lnf2ks6pna152wafm9x";
+    sha256 = "0xgnjj7jd56wbl99s76sa1vjq9bkz4mdsxwgwlcphg689liyncf4";
   };
 
   propagatedBuildInputs = [