diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 853edee..2b20a14 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -85,6 +85,7 @@ jobs:
           install.packages("lavaan")
           install.packages("testthat")
           install.packages("devtools")
+          install.packages("mokken")
           devtools::build(pkg = ".", binary = TRUE)
           rcmdcheck::rcmdcheck(args = "--no-manual", error_on = "warning")
         shell: Rscript {0}