diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b1baf601debe26cd9eaab7f61c60b5a7402e402b..fa7d4fc3eb9270bc177915397d0892843333ca7b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,6 +19,7 @@ testing:
       - master
   coverage: '/coverage: \d+.\d+% of statements/'
   script:
+      - Rscript -e 'install.packages("testthat")'
       - Rscript -e 'install.packages("DT")'
       - Rscript -e 'install.packages("covr")'
       - Rscript -e 'covr::gitlab(quiet = FALSE)'