diff --git a/pack/plantuml-syntax/opt/plantuml-syntax b/pack/plantuml-syntax/opt/plantuml-syntax
new file mode 160000
index 0000000..845abb5
--- /dev/null
+++ b/pack/plantuml-syntax/opt/plantuml-syntax
@@ -0,0 +1 @@
+Subproject commit 845abb56dcd3f12afa6eb47684ef5ba3055802b8
diff --git a/pack/sessionman/opt/sessionman b/pack/sessionman/opt/sessionman
index 845d35b..1465951 160000
--- a/pack/sessionman/opt/sessionman
+++ b/pack/sessionman/opt/sessionman
@@ -1 +1 @@
-Subproject commit 845d35b84c5c51f631d8bfa4afe3edc126102ba9
+Subproject commit 1465951fd6bb68e4d8cd239739cd12f3b6600aba
diff --git a/vimfiles.stefan/colors/Stefan.vim b/vimfiles.stefan/colors/Stefan.vim
index c94efaf..fb9dc7e 100644
--- a/vimfiles.stefan/colors/Stefan.vim
+++ b/vimfiles.stefan/colors/Stefan.vim
@@ -106,3 +106,7 @@ hi netrwMarkFile                                                          gui=bo
 " Termdebug
 hi debugPC                                                                                              guibg=darkgreen
 hi debugBreakpoint                                                                                      guibg=red
+
+" Spell
+hi  clear  Spellad
+hi SpellBad cterm=underline ctermbg=DarkRed gui=undercurl
diff --git a/vimfiles.stefan/vimrc b/vimfiles.stefan/vimrc
index 613f950..cd77d0b 100644
--- a/vimfiles.stefan/vimrc
+++ b/vimfiles.stefan/vimrc
@@ -44,14 +44,16 @@ packadd! flake8
 packadd! flog
 packadd! fugitive
 "packadd! gdb-from-vim
+"packadd! git-lens.vim
 packadd! gundo
 packadd! isort
 packadd! linediff
 packadd! merginal
+packadd! plantuml-syntax
 "packadd! pyclewn
 "packadd! pylint
 packadd! python-pep8-indent
-packadd! qml
+packadd qml
 packadd! sessionman
 packadd! SrchRplcHiGrp
 packadd! syntastic
@@ -59,7 +61,7 @@ packadd! tagbar
 "packadd! tail
 packadd! tcomment
 packadd! termdebug
-packadd! vc
+" packadd! vc
 packadd! vimagit
 packadd! vim-clang-format
 packadd! VisIncr
@@ -67,6 +69,12 @@ packadd! xml
 packadd! yapf
 packadd! YouCompleteMe
 
+" call plug#begin()
+" ...
+" Plug 'Eliot00/git-lens.vim'
+" ...
+" call plug#end()
+
 " global settings
 " ---------------
 set nobackup            " keep no backup file
@@ -83,10 +91,13 @@ filetype plugin indent on
 "syntax on
 syntax enable
 
-" no syntax highliting when printing
+" no syntax highlighting when printing
 set printoptions+=syntax:n
 
-"highlite search
+# truecolor for console
+set termguicolors
+
+"highlight search
 set incsearch
 set hlsearch
 
@@ -157,6 +168,8 @@ if &diff
     set guioptions+=b
     " turn off csv ftplugin in diff mode
     au! filetypedetect * *.csv,*.dat,*.tsv,*.tab
+    " Turn off spellcheck
+    setlocal nospell
 endif
 
 " horizontal scrollbar in diff-mode
@@ -262,7 +275,7 @@ let g:DoxygenToolkit_compactOneLineDoc  = "yes"
 let g:DoxygenToolkit_compactDoc         = "yes"
 " Replace version by copyright ...
 let g:DoxygenToolkit_versionTag         = "@copyright "
-let g:DoxygenToolkit_versionString      = "(c) 2020 TOPTICA Photonics AG"
+let g:DoxygenToolkit_versionString      = "(c) 2020-2023 TOPTICA Photonics AG"
 
 " -----
 " netrw
@@ -311,6 +324,10 @@ let g:ycm_clangd_args = ['--all-scopes-completion', '--header-insertion=iwyu', '
 " use tt for YCM GoTo
 nnoremap tt :YcmCompleter GoTo<CR>
 
+" -----
+" Gundo
+" -----
+let g:gundo_prefer_python3 = 1
 
 if exists('g:debug')
     if (g:debug > 0)