diff --git a/pkgs/applications/gis/qgis/default.nix b/pkgs/applications/gis/qgis/default.nix
index 896387b1f7f4..279d83e92193 100644
--- a/pkgs/applications/gis/qgis/default.nix
+++ b/pkgs/applications/gis/qgis/default.nix
@@ -5,7 +5,7 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "qgis-2.18.17";
+  name = "qgis-2.18.20";
 
   buildInputs = [ gdal qt4 flex openssl bison proj geos xlibsWrapper sqlite gsl qwt qscintilla
     fcgi libspatialindex libspatialite postgresql qjson qca2 txt2tags pkgconfig ]
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "http://qgis.org/downloads/${name}.tar.bz2";
-    sha256 = "1nxwl5lwibbiz9v3qaw3px7iyxg113zr4j8d99yj07mhk2ap082y";
+    sha256 = "0bm9sv268lc3v48zjypsjjs62xnyb7zabzrms4jsy020waz6sk9g";
   };
 
   # CMAKE_FIND_FRAMEWORK=never stops the installer choosing system