diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 79341eb6..faa48a8d 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -83,14 +83,14 @@ jobs:
     - name: cache hypre
       if: matrix.mpi == 'par'
       id: hypre-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.HYPRE_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.HYPRE_TOP_DIR }}-v2.2
 
     - name: build hypre
       if: steps.hypre-cache.outputs.cache-hit != 'true' && matrix.mpi == 'par'
-      uses: mfem/github-actions/build-hypre@v2.2
+      uses: mfem/github-actions/build-hypre@v2.4
       with:
         archive: ${{ env.HYPRE_ARCHIVE }}
         dir: ${{ env.HYPRE_TOP_DIR }}
@@ -101,14 +101,14 @@ jobs:
     - name: cache metis
       if: matrix.mpi == 'par'
       id: metis-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.METIS_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.METIS_TOP_DIR }}-v2.2
 
     - name: build metis
       if: steps.metis-cache.outputs.cache-hit != 'true' && matrix.mpi == 'par'
-      uses: mfem/github-actions/build-metis@v2.2
+      uses: mfem/github-actions/build-metis@v2.4
       with:
         archive: ${{ env.METIS_ARCHIVE }}
         dir: ${{ env.METIS_TOP_DIR }}
@@ -131,7 +131,7 @@ jobs:
     # Install will only run on cache miss.
     - name: cache mfem
       id: cache-mfem
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.MFEM_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.MFEM_TOP_DIR }}-${{ env.MFEM_COMMIT }}-${{ matrix.target }}-${{ matrix.build-system}}-v2.4
@@ -165,9 +165,9 @@ jobs:
         sudo apt-get update
         sudo apt-get install libfontconfig1-dev libfreetype6-dev libsdl2-dev libglew-dev libglm-dev libpng-dev
 
-    - name: Set up Homebrew
-      if: matrix.os == 'macos-latest'
-      uses: Homebrew/actions/setup-homebrew@master
+    # - name: Set up Homebrew
+    #   if: matrix.os == 'macos-latest'
+    #   uses: Homebrew/actions/setup-homebrew@master
 
     - name: get deps (MacOS)
       if: matrix.os == 'macos-latest'
@@ -177,7 +177,7 @@ jobs:
 
     - name: cache deps (Windows)
       id: cache-deps
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: vcpkg_cache
         key: ${{ runner.os }}-vcpkg-v1
@@ -188,7 +188,7 @@ jobs:
         mkdir -p vcpkg_cache
 
     - name: checkout GLVis
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         path: glvis
         submodules: recursive
@@ -222,7 +222,7 @@ jobs:
 
     - name: setup Python
       if: matrix.build-system == 'cmake'
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.9
 
@@ -258,7 +258,7 @@ jobs:
 
     - name: upload test screenshots
       if: always() && matrix.build-system == 'cmake' && matrix.os != 'windows-latest'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: test-screenshots-${{ matrix.os }}-${{ matrix.target }}-${{ matrix.mpi }}
         path: glvis/build/test_screenshots.tar.gz
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1bb178d0..f430b345 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -67,14 +67,14 @@ jobs:
     - name: cache hypre
       if: matrix.mpi == 'par'
       id: hypre-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.HYPRE_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.HYPRE_TOP_DIR }}-v2.2
 
     - name: build hypre
       if: steps.hypre-cache.outputs.cache-hit != 'true' && matrix.mpi == 'par'
-      uses: mfem/github-actions/build-hypre@v2.2
+      uses: mfem/github-actions/build-hypre@v2.4
       with:
         archive: ${{ env.HYPRE_ARCHIVE }}
         dir: ${{ env.HYPRE_TOP_DIR }}
@@ -85,14 +85,14 @@ jobs:
     - name: cache metis
       if: matrix.mpi == 'par'
       id: metis-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.METIS_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.METIS_TOP_DIR }}-v2.2
 
     - name: build metis
       if: steps.metis-cache.outputs.cache-hit != 'true' && matrix.mpi == 'par'
-      uses: mfem/github-actions/build-metis@v2.2
+      uses: mfem/github-actions/build-metis@v2.4
       with:
         archive: ${{ env.METIS_ARCHIVE }}
         dir: ${{ env.METIS_TOP_DIR }}
@@ -115,7 +115,7 @@ jobs:
     # Install will only run on cache miss.
     - name: cache mfem
       id: cache-mfem
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ env.MFEM_TOP_DIR }}
         key: ${{ runner.os }}-build-${{ env.MFEM_TOP_DIR }}-${{ env.MFEM_COMMIT }}-${{ matrix.target }}-${{ matrix.build-system}}-v2.2
@@ -127,7 +127,7 @@ jobs:
     # superfluous.
     - name: build mfem
       if: steps.cache-mfem.outputs.cache-hit != 'true'
-      uses: mfem/github-actions/build-mfem@v2.2
+      uses: mfem/github-actions/build-mfem@v2.4
       with:
         os: ${{ matrix.os }}
         target: ${{ matrix.target }}
@@ -148,9 +148,9 @@ jobs:
         sudo apt-get update
         sudo apt-get install libfontconfig1-dev libfreetype6-dev libsdl2-dev libglew-dev libglm-dev libpng-dev
 
-    - name: Set up Homebrew
-      if: matrix.os == 'macos-latest'
-      uses: Homebrew/actions/setup-homebrew@master
+    # - name: Set up Homebrew
+    #   if: matrix.os == 'macos-latest'
+    #   uses: Homebrew/actions/setup-homebrew@master
 
     - name: get deps (MacOS)
       if: matrix.os == 'macos-latest'
@@ -160,7 +160,7 @@ jobs:
 
     - name: cache deps (Windows)
       id: cache-deps
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: vcpkg_cache
         key: ${{ runner.os }}-vcpkg-v1
@@ -171,7 +171,7 @@ jobs:
         mkdir -p vcpkg_cache
 
     - name: checkout GLVis
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         path: glvis
         submodules: recursive
@@ -227,7 +227,7 @@ jobs:
         cp GLVis.dmg ${GLVIS_EXPORT_NAME}
 
     - name: upload binary
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: glvis-${{ github.ref_name }}-${{ runner.os }}-amd64
         path: glvis/build/glvis-${{ github.ref_name }}-${{ runner.os }}-amd64
diff --git a/tests/data b/tests/data
index 53fbee22..81de802a 160000
--- a/tests/data
+++ b/tests/data
@@ -1 +1 @@
-Subproject commit 53fbee222cceb0581122cb72518bfc1b85766b4e
+Subproject commit 81de802ad63ba41cd1fcd3825fbb3d2471538ace