diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8796bb1..62d332c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -80,8 +80,6 @@ jobs:
       # See https://github.com/jqlang/jq/issues/1571
       run: |
         devcontainer_image=$(grep -v "//" .devcontainer/devcontainer.json | jq --raw-output .image)
-        echo "$devcontainer_image"
-        echo "$PUBLIC_IMAGE_NAME:$IMAGE_VERSION"
         test "$devcontainer_image" = "$PUBLIC_IMAGE_NAME:$IMAGE_VERSION"
 
     - name: Build and run dev container task
diff --git a/tests/dev_container.sh b/tests/dev_container.sh
index 6fe6971..63e6957 100755
--- a/tests/dev_container.sh
+++ b/tests/dev_container.sh
@@ -7,6 +7,13 @@ set -euxo pipefail
 # Check the OpenSAFELY research-template example runs.
 opensafely run run_all
 
+# Check the R packages.
+opensafely_r_packages=$(curl -s https://raw.githubusercontent.com/opensafely-core/r-docker/main/renv.lock |
+    jq  '.Packages | keys')
+r_installed=$(Rscript -e 'installed_packages <- as.data.frame(installed.packages()[,c(1,3:4)])' \
+    -e 'package_names<-unique(installed_packages[installed_packages$Priority!="base"|is.na(installed_packages$Priority),,drop=FALSE][["Package"]])'
+    -e 'cat(package_names[! package_names %in% c("docopt","spatial","littler")],sep="\n")')
+
 # Check the Python packages are as the Python image from which they are taken.
 python_image_version="v2"
 opensafely pull "python:$python_image_version"