diff --git a/pkgs/development/python-modules/mat2/default.nix b/pkgs/development/python-modules/mat2/default.nix
index 0d54656c1586..31bf90f7f0ae 100644
--- a/pkgs/development/python-modules/mat2/default.nix
+++ b/pkgs/development/python-modules/mat2/default.nix
@@ -21,7 +21,7 @@
 
 buildPythonPackage rec {
   pname = "mat2";
-  version = "0.12.2";
+  version = "0.12.3";
 
   disabled = pythonOlder "3.5";
 
@@ -30,7 +30,7 @@ buildPythonPackage rec {
     owner = "jvoisin";
     repo = "mat2";
     rev = version;
-    sha256 = "sha256-KaHdBmTeBlCRaVkG3WsfDtFo45s/X69x7VGDYY7W5O8=";
+    hash = "sha256-TW+FwlZ+J1tanPL5WuwXtZJmtYB9LaimeIaPlN/jzqo=";
   };
 
   patches = [
@@ -40,8 +40,6 @@ buildPythonPackage rec {
       bwrap = "${bubblewrap}/bin/bwrap";
       exiftool = "${exiftool}/bin/exiftool";
       ffmpeg = "${ffmpeg}/bin/ffmpeg";
-      # remove once faf0f8a8a4134edbeec0a73de7f938453444186d is in master
-      mimetypes = "${mime-types}/etc/mime.types";
     } // lib.optionalAttrs dolphinIntegration {
       kdialog = "${plasma5Packages.kdialog}/bin/kdialog";
     }))
diff --git a/pkgs/development/python-modules/mat2/paths.patch b/pkgs/development/python-modules/mat2/paths.patch
index 7e828d3f5339..50b0c9aaa789 100644
--- a/pkgs/development/python-modules/mat2/paths.patch
+++ b/pkgs/development/python-modules/mat2/paths.patch
@@ -1,5 +1,5 @@
 diff --git a/dolphin/mat2.desktop b/dolphin/mat2.desktop
-index d365bc5..56313e2 100644
+index 41c8de4..11df258 100644
 --- a/dolphin/mat2.desktop
 +++ b/dolphin/mat2.desktop
 @@ -8,6 +8,6 @@ Type=Service
@@ -7,11 +7,11 @@ index d365bc5..56313e2 100644
  Name[de]=Metadaten löschen
  Name[es]=Limpiar metadatos
 -Icon=/usr/share/icons/hicolor/scalable/apps/mat2.svg
--Exec=kdialog --yesno  "$( mat2 -s %U )" --title "Clean Metadata?" && mat2 %U
--Exec[de]=kdialog --yesno  "$( mat2 -s %U )" --title "Metadaten löschen?" && mat2 %U
+-Exec=kdialog --yesno  "$( mat2 -s %F )" --title "Clean Metadata?" && mat2 %U
+-Exec[de]=kdialog --yesno  "$( mat2 -s %F )" --title "Metadaten löschen?" && mat2 %U
 +Icon=@mat2svg@
-+Exec=@kdialog@ --yesno  "$( mat2 -s %U )" --title "Clean Metadata?" && mat2 %U
-+Exec[de]=@kdialog@ --yesno  "$( mat2 -s %U )" --title "Metadaten löschen?" && mat2 %U
++Exec=@kdialog@ --yesno  "$( @mat2@ -s %F )" --title "Clean Metadata?" && @mat2@ %U
++Exec[de]=@kdialog@ --yesno  "$( @mat2@ -s %F )" --title "Metadaten löschen?" && @mat2@ %U
 diff --git a/libmat2/bubblewrap.py b/libmat2/bubblewrap.py
 index 970d5dd..5d3c0b7 100644
 --- a/libmat2/bubblewrap.py
@@ -76,20 +76,8 @@ index eb65b2a..51a0fa1 100644
 -
 -    raise RuntimeError("Unable to find exiftool")
 +    return '@exiftool@'
-diff --git a/libmat2/parser_factory.py b/libmat2/parser_factory.py
-index 9965432..bd45179 100644
---- a/libmat2/parser_factory.py
-+++ b/libmat2/parser_factory.py
-@@ -8,6 +8,7 @@ from . import abstract, UNSUPPORTED_EXTENSIONS
- 
- T = TypeVar('T', bound='abstract.AbstractParser')
- 
-+mimetypes.init(['@mimetypes@'])
- mimetypes.add_type('application/epub+zip', '.epub')
- mimetypes.add_type('application/x-dtbncx+xml', '.ncx')  # EPUB Navigation Control XML File
- 
 diff --git a/libmat2/video.py b/libmat2/video.py
-index b4a3232..3dd7ee5 100644
+index ae9e463..2acc65c 100644
 --- a/libmat2/video.py
 +++ b/libmat2/video.py
 @@ -1,6 +1,4 @@