diff --git a/.github/workflows/sandpaper-main.yaml b/.github/workflows/sandpaper-main.yaml
index e17707a..cd88925 100644
--- a/.github/workflows/sandpaper-main.yaml
+++ b/.github/workflows/sandpaper-main.yaml
@@ -21,7 +21,10 @@ on:
 jobs:
   full-build:
     name: "Build Full Site"
-    runs-on: ubuntu-latest
+
+    # 2024-10-01: ubuntu-latest is now 24.04 and R is not installed by default in the runner image
+    # pin to 22.04 for now
+    runs-on: ubuntu-22.04
     permissions:
       checks: write
       contents: write
@@ -32,7 +35,7 @@ jobs:
     steps:
 
       - name: "Checkout Lesson"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Set up R"
         uses: r-lib/actions/setup-r@v2
@@ -58,4 +61,4 @@ jobs:
           reset <- "${{ github.event.inputs.reset }}" == "true"
           sandpaper::package_cache_trigger(TRUE)
           sandpaper:::ci_deploy(reset = reset)
-        shell: Rscript {0}
+        shell: Rscript {0}
\ No newline at end of file