diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 19384a1..a792eaa 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
             | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
 
       - name: Cache apt packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /var/cache/apt/archives/*.deb
           key: apt-php-builder-deps-${{ runner.arch }}-v1
@@ -44,6 +44,7 @@ jobs:
       # builder's dependencies, and times the step that consumes them.
       - name: Report restored .debs
         run: |
+          echo "ACTIONS_CACHE_URL: ${ACTIONS_CACHE_URL:-<unset>}"
           echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
           echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
           date -u +'setup-php start: %H:%M:%S'
@@ -55,7 +56,7 @@ jobs:
           tools: composer:v2
 
       - name: Cache Composer packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache
           key: composer-${{ hashFiles('composer.json') }}
@@ -98,7 +99,7 @@ jobs:
             | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
 
       - name: Cache apt packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /var/cache/apt/archives/*.deb
           key: apt-php-builder-deps-${{ runner.arch }}-v1
@@ -107,6 +108,7 @@ jobs:
       # builder's dependencies, and times the step that consumes them.
       - name: Report restored .debs
         run: |
+          echo "ACTIONS_CACHE_URL: ${ACTIONS_CACHE_URL:-<unset>}"
           echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
           echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
           date -u +'setup-php start: %H:%M:%S'
@@ -120,7 +122,7 @@ jobs:
           tools: composer:v2
 
       - name: Cache Composer packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache
           key: ${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
@@ -170,7 +172,7 @@ jobs:
             | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
 
       - name: Cache apt packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /var/cache/apt/archives/*.deb
           key: apt-php-builder-deps-${{ runner.arch }}-v1
@@ -179,6 +181,7 @@ jobs:
       # builder's dependencies, and times the step that consumes them.
       - name: Report restored .debs
         run: |
+          echo "ACTIONS_CACHE_URL: ${ACTIONS_CACHE_URL:-<unset>}"
           echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
           echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
           date -u +'setup-php start: %H:%M:%S'