diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e43652b442..99aa5dcb41 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -140,6 +140,7 @@ jobs:
           remotes::install_cran("magrittr", force=TRUE)
           remotes::install_cran("testthat", force=TRUE)
           remotes::install_cran("glue", force=TRUE)
+          remotes::install_cran("diffobj", force=TRUE)
         shell: Rscript {0}
 
       - name: Check