diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 71836ac..004f184 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 # use the verse rocker image, as it contains tidyverse, devtools and some texlive
-image: rocker/verse
+image: rocker/tidyverse
 
 # define stages of runner. at the moment,
 # just build (no test or deploy).
@@ -23,25 +23,24 @@
 
     - start_section install_linux_packages "Installing missing Linux packages"
     - apt-get update
-    - apt-get install -y build-essential libglpk40 libcurl4-gnutls-dev libxml2-dev libsodium-dev libsecret-1-dev libfontconfig1-dev libssl-dev libxt6 libpq-dev imagemagick ghostscript software-properties-common inkscape scour
-    - add-apt-repository ppa:saiarcot895/chromium-beta
-    - apt update
-    - apt install -y chromium-browser
+    - apt-get install -y libvulkan1 libu2f-udev fonts-liberation build-essential libglpk40 libcurl4-gnutls-dev libxml2-dev libsodium-dev libsecret-1-dev libfontconfig1-dev libssl-dev libxt6 libpq-dev imagemagick ghostscript  inkscape scour
+    - wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
+    - dpkg -i google-chrome-stable_current_amd64.deb || apt-get install -y -f
     - locale-gen de_DE.utf8 en_GB.utf8 en_US.utf8
     - end_section install_linux_packages
 
+    - start_section testing_chromium "Testing chromium PDF export"
+    - ./ci/html2pdf https://google.com test.pdf 1
+    - ls -l ./test.pdf
+    - end_section testing_chromium
+
     - start_section install_fonts "Installing Libertinus and Fira fonts"
     - wget -O- https://github.com/mozilla/Fira/archive/refs/tags/4.202.tar.gz | tar -C /usr/share/fonts -zx --wildcards "*.otf"
     - fc-cache
     - end_section install_fonts
 
-    - start_section testing_chromium Testing chromium PDF export
-    - chromium-browser --headless --disable-gpu --no-sandbox --run-all-compositor-stages-before-draw --no-pdf-header-footer --print-to-pdf-no-header --print-to-pdf=./test.pdf https://www.ids-mannheim.de/
-    - ls -l ./test.pdf
-    - end_section testing_chromium
-
     - start_section install_r_packages "Installing missing R packages"
-    - R -e "install.packages(c('scales', 'sp', 'raster', 'kableExtra', 'DT', 'svglite'))"
+    - R -e "install.packages(c('devtools', 'scales', 'sp', 'raster', 'kableExtra', 'DT', 'svglite'))"
     - R -e 'devtools::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/idsThemeR")'
     - R -e 'devtools::install_git("https://korap.ids-mannheim.de/gerrit/IDS-Mannheim/posterdown")'
     - end_section install_r_packages