diff --git a/nix/docker/default.nix b/nix/docker/default.nix
index 98ec639da..1f63f37f7 100644
--- a/nix/docker/default.nix
+++ b/nix/docker/default.nix
@@ -31,11 +31,12 @@ let
       busybox # should provide a working lpr -- to be tested
       htop
       pdftk # for encrypting pdfs
+      roboto roboto-mono
       #texlive.combined.scheme-medium # too large for container in LMU build environment.
       (texlive.combine {
           inherit (texlive) scheme-basic
             babel-german babel-english booktabs textpos
-            enumitem eurosym koma-script parskip xcolor dejavu
+            enumitem eurosym koma-script parskip xcolor roboto
             # required fro LuaTeX
             luatexbase lualatex-math unicode-math selnolig
             ;
diff --git a/shell.nix b/shell.nix
index 42c65ae1f..d11179020 100644
--- a/shell.nix
+++ b/shell.nix
@@ -279,13 +279,14 @@ in pkgs.mkShell {
       # busybox # for print services, but interferes with build commands in develop-shell
       htop
       pdftk # pdftk just for testing pdf-passwords
+      roboto roboto-mono
       # texlive.combined.scheme-full # works
       # texlive.combined.scheme-medium
       # texlive.combined.scheme-small
       (texlive.combine {
         inherit (texlive) scheme-basic
         babel-german babel-english booktabs textpos
-        enumitem eurosym koma-script parskip xcolor dejavu
+        enumitem eurosym koma-script parskip xcolor roboto
         luatexbase lualatex-math unicode-math selnolig # required for LuaTeX
         ;
       })
diff --git a/templates/letter/din5008.latex b/templates/letter/din5008.latex
index 17042126a..744b76d91 100644
--- a/templates/letter/din5008.latex
+++ b/templates/letter/din5008.latex
@@ -59,6 +59,8 @@ $endfor$
 \def\languageshorthands#1{}
 $endif$
 
+\usepackage[sfdefault]{roboto}
+
 \ifLuaTeX
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
@@ -67,11 +69,11 @@ $endif$
   \usepackage[$if(fontenc)$$fontenc$$else$T1$endif$]{fontenc}
   \usepackage[utf8]{inputenc}
   \usepackage{textcomp} % provide euro and other symbols
-  \usepackage{DejaVuSansMono} % better monofont
+  % \usepackage{DejaVuSansMono} % better monofont
 \else 
   % if luatex or xetex
   \usepackage{fontspec}
-  \setmonofont{DejaVu Sans Mono}
+  % \setmonofont{DejaVu Sans Mono}  
 \fi
 \renewcommand{\familydefault}{\sfdefault}
 
diff --git a/templates/letter/din5008with_pin.latex b/templates/letter/din5008with_pin.latex
index fe950b11c..3401230d7 100644
--- a/templates/letter/din5008with_pin.latex
+++ b/templates/letter/din5008with_pin.latex
@@ -63,15 +63,17 @@ $endif$
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
 
+\usepackage[sfdefault]{roboto}
+
 \ifPDFTeX
   \usepackage[$if(fontenc)$$fontenc$$else$T1$endif$]{fontenc}
   \usepackage[utf8]{inputenc}
   \usepackage{textcomp} % provide euro and other symbols
-  \usepackage{DejaVuSansMono} % better monofont
+  % \usepackage{DejaVuSansMono} % better monofont
 \else 
   % if luatex or xetex
   \usepackage{fontspec}
-  \setmonofont{DejaVu Sans Mono}
+  % \setmonofont{DejaVu Sans Mono}
 \fi 
 \renewcommand{\familydefault}{\sfdefault}
 
diff --git a/templates/letter/plain_article.latex b/templates/letter/plain_article.latex
index 7c4038158..4ba5a5540 100644
--- a/templates/letter/plain_article.latex
+++ b/templates/letter/plain_article.latex
@@ -56,19 +56,21 @@ $endif$
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
 
+\usepackage[sfdefault]{roboto}
+
 \ifPDFTeX
   \usepackage{helvet}
   \usepackage[$if(fontenc)$$fontenc$$else$T1$endif$]{fontenc}
   \usepackage[utf8]{inputenc}
   \usepackage{textcomp}% provide euro and other symbols
-  \usepackage{DejaVuSansMono}% better monofont  
+  % \usepackage{DejaVuSansMono}% better monofont  
   \renewcommand{\familydefault}{\sfdefault}
 \else 
   % if luatex or xetex
   \usepackage{fontspec}    
   %\setmainfont{TeXGyreHeros}%could not install the package somehow tex-gyre in default.nix/shell.nix did not work
-  \setmainfont{DejaVu Sans}
-  \setmonofont{DejaVu Sans Mono}
+  % \setmainfont{DejaVu Sans}
+  %\setmonofont{DejaVu Sans Mono}
   \renewcommand{\familydefault}{\sfdefault}
 \fi