diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 17d83e8..340d68d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         env:
           cache-name: cache-artifacts
         with:
@@ -71,6 +71,9 @@ jobs:
             Pkg.instantiate()'
         env:
           PYTHON: ""
+      - run: julia --project=docs -e 'using Conda; Conda.add("matplotlib")'
+        env:
+          PYTHON: ""
       # - run: |
       #     julia --project=docs -e '
       #       using Documenter: doctest
diff --git a/docs/Project.toml b/docs/Project.toml
index b64a9dc..d9bc6b5 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -14,8 +14,6 @@ Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
 SimplexGridFactory = "57bfcd06-606e-45d6-baf4-4ba06da0efd5"
 TetGen = "c5d3f3f7-f850-59f6-8a2e-ffc6dc1317ea"
 Triangulate = "f7e6ffb2-c36d-4f8f-a77e-16e897189344"
-VoronoiFVM = "82b139dc-5afc-11e9-35da-9b9bdfd336f3"
 
 [compat]
 ExampleJuggler = "2"
-VoronoiFVM = "1.21"