diff --git a/nixos/tests/postgis.nix b/nixos/tests/postgis.nix
index 9d81ebaad85f..d0685abc510c 100644
--- a/nixos/tests/postgis.nix
+++ b/nixos/tests/postgis.nix
@@ -9,7 +9,7 @@ import ./make-test-python.nix ({ pkgs, ...} : {
       { pkgs, ... }:
 
       {
-        services.postgresql = let mypg = pkgs.postgresql_11; in {
+        services.postgresql = let mypg = pkgs.postgresql; in {
             enable = true;
             package = mypg;
             extraPlugins = with mypg.pkgs; [
diff --git a/pkgs/servers/sql/postgresql/ext/postgis.nix b/pkgs/servers/sql/postgresql/ext/postgis.nix
index 328f2f64eba7..5745630964e4 100644
--- a/pkgs/servers/sql/postgresql/ext/postgis.nix
+++ b/pkgs/servers/sql/postgresql/ext/postgis.nix
@@ -16,13 +16,13 @@
 }:
 stdenv.mkDerivation rec {
   pname = "postgis";
-  version = "3.3.3";
+  version = "3.4.0";
 
   outputs = [ "out" "doc" ];
 
   src = fetchurl {
     url = "https://download.osgeo.org/postgis/source/postgis-${version}.tar.gz";
-    sha256 = "sha256-dOs1bj+F8UIzeRATNgiBtnSPeAgcxoj/nW8PZzp2LRM=";
+    sha256 = "sha256-rum2CmyITTVBZLMJbEZX8yRFQYZgf4WdHOBdiZeYr50=";
   };
 
   buildInputs = [ libxml2 postgresql geos proj gdal json_c protobufc pcre2.dev ]
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
 
   preConfigure = ''
     sed -i 's@/usr/bin/file@${file}/bin/file@' configure
-    configureFlags="--datadir=$out/share/postgresql --datarootdir=$out/share/postgresql --bindir=$out/bin --docdir=$doc/share/doc/${pname} --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev}"
+    configureFlags="--datadir=$out/share/postgresql --datarootdir=$out/share/postgresql --bindir=$out/bin --docdir=$doc/share/doc/${pname} --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev} --disable-extension-upgrades-install"
 
     makeFlags="PERL=${perl}/bin/perl datadir=$out/share/postgresql pkglibdir=$out/lib bindir=$out/bin docdir=$doc/share/doc/${pname}"
   '';
@@ -76,5 +76,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2;
     maintainers = [ maintainers.marcweber ];
     inherit (postgresql.meta) platforms;
+    broken = versionOlder postgresql.version "12";
   };
 }