diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 4a07eaf2..dfdba9a8 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -22,14 +22,14 @@ jobs:
         uses: mamba-org/provision-with-micromamba@e2b397b12d0a38069451664382b769c9456e3d6d
         with:
           cache-env: true
-      - name:
-        shell: bash -l {0}
-        run: |
-          which pdflatex
       - name: Install TinyTex
         shell: bash -l {0}
         run: |
           Rscript -e 'tinytex::install_tinytex(force = TRUE)'
+      - name: Install demo datasets
+        shell: bash -l {0}
+        run: |
+          Rscript -e 'install.packages(c("mimic.demo", "eicu_demo"), repos="https://eth-mds.github.io/physionet-demo")'
       - name: Run R CMD check
         shell: bash -l {0}
         run: |
diff --git a/environment.yml b/environment.yml
index f53bb12b..15f1b4bf 100644
--- a/environment.yml
+++ b/environment.yml
@@ -31,4 +31,6 @@ dependencies:
   - r-covr
   - r-units
   - r-tinytex
-  - texlive-core # for CI
\ No newline at end of file
+  - r-testthat
+  - r-mockthat
+  - r-pkgload
\ No newline at end of file