diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 7fcd81d1..00cddd13 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -21,7 +21,7 @@ jobs:
           echo "environment=${VERSION//.}" >> $GITHUB_OUTPUT
       - name: Cache LLVM and Clang
         id: cache-llvm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: llvm/lib/libclang.so*
           key: llvm-17
@@ -46,7 +46,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: llvm/lib/libclang.so*
           key: llvm-17
@@ -81,7 +81,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: llvm/lib/libclang.so*
           key: llvm-17
@@ -106,7 +106,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: llvm/lib/libclang.so*
           key: llvm-17
@@ -133,7 +133,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: llvm/lib/libclang.so*
           key: llvm-6
diff --git a/tox.ini b/tox.ini
index f978728b..644b8d87 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,6 +46,12 @@ deps =
     pytest
     clang==6.0
     beautifulsoup4
+    sphinxcontrib-applehelp==1.0.4
+    sphinxcontrib-devhelp==1.0.2
+    sphinxcontrib-htmlhelp==2.0.1
+    sphinxcontrib-qthelp==1.0.3
+    sphinxcontrib-serializinghtml==1.1.5
+    alabaster==0.7.13
 
 [testenv:sphinx-three]
 deps = {[sphinx]deps}