diff --git a/pkgs/applications/gis/grass/default.nix b/pkgs/applications/gis/grass/default.nix
index 4eb10a34d2e24..41d560a4ebd52 100644
--- a/pkgs/applications/gis/grass/default.nix
+++ b/pkgs/applications/gis/grass/default.nix
@@ -23,7 +23,7 @@
 , pkg-config
 , postgresql
 , proj
-, python3Packages
+, python311Packages
 , readline
 , sqlite
 , wxGTK32
@@ -31,6 +31,9 @@
 , zstd
 }:
 
+let
+  pyPackages = python311Packages;
+in
 stdenv.mkDerivation (finalAttrs: {
   pname = "grass";
   version = "8.3.2";
@@ -53,7 +56,7 @@ stdenv.mkDerivation (finalAttrs: {
     libmysqlclient # for `mysql_config`
     netcdf # for `nc-config`
     pkg-config
-  ] ++ (with python3Packages; [ python-dateutil numpy wxpython ]);
+  ] ++ (with pyPackages; [ python-dateutil numpy wxpython ]);
 
   buildInputs = [
     blas
@@ -86,7 +89,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   # Correct mysql_config query
   postPatch = ''
-      substituteInPlace configure --replace "--libmysqld-libs" "--libs"
+    substituteInPlace configure --replace "--libmysqld-libs" "--libs"
   '';
 
   configureFlags = [
@@ -127,7 +130,7 @@ stdenv.mkDerivation (finalAttrs: {
   postInstall = ''
     wrapProgram $out/bin/grass \
     --set PYTHONPATH $PYTHONPATH \
-    --set GRASS_PYTHON ${python3Packages.python.interpreter} \
+    --set GRASS_PYTHON ${pyPackages.python.interpreter} \
     --suffix LD_LIBRARY_PATH ':' '${gdal}/lib'
     ln -s $out/grass*/lib $out/lib
     ln -s $out/grass*/include $out/include
diff --git a/pkgs/applications/gis/qgis/unwrapped-ltr.nix b/pkgs/applications/gis/qgis/unwrapped-ltr.nix
index 3515294150255..c1d334909e1f0 100644
--- a/pkgs/applications/gis/qgis/unwrapped-ltr.nix
+++ b/pkgs/applications/gis/qgis/unwrapped-ltr.nix
@@ -29,7 +29,7 @@
 , postgresql
 , proj
 , protobuf
-, python3
+, python311
 , qca-qt5
 , qscintilla
 , qt3d
@@ -48,7 +48,7 @@
 }:
 
 let
-  py = python3.override {
+  py = python311.override {
     packageOverrides = self: super: {
       pyqt5 = super.pyqt5.override {
         withLocation = true;
diff --git a/pkgs/applications/gis/qgis/unwrapped.nix b/pkgs/applications/gis/qgis/unwrapped.nix
index 3efce9160d051..dfee6b06b598a 100644
--- a/pkgs/applications/gis/qgis/unwrapped.nix
+++ b/pkgs/applications/gis/qgis/unwrapped.nix
@@ -29,7 +29,7 @@
 , postgresql
 , proj
 , protobuf
-, python3
+, python311
 , qca-qt5
 , qscintilla
 , qt3d
@@ -48,7 +48,7 @@
 }:
 
 let
-  py = python3.override {
+  py = python311.override {
     packageOverrides = self: super: {
       pyqt5 = super.pyqt5.override {
         withLocation = true;