diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 11074de..514bab2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -36,7 +36,7 @@ jobs:
       run: git tag v0.0.0
     - uses: snapcore/action-build@v1
       id: snap-build
-    - uses: actions/upload-artifact@v1
+    - uses: actions/upload-artifact@v4
       with:
         name: charm-snap
         path: ${{ steps.snap-build.outputs.snap }}
@@ -67,7 +67,7 @@ jobs:
         repository: juju-solutions/layer-basic
 
     - name: Download built charm snap
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: charm-snap
         path: tests/charm-minimal/charm-snap
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 2862ce3..9bbe7ad 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -34,6 +34,9 @@ parts:
       - libffi-dev
       - libpython3.10-dev
       - python3-pip
+      - rustc
+      - cargo
+      - pkg-config
     # Note that we cannot use any -dev type packages here, as that would pull
     # in the libc6 package.  The libc6 package contains absolute symlinks
     # pointing at /, which is not allowed in a core22 classic snap.