diff --git a/.github/actions/build-docs/Dockerfile b/.github/actions/build-docs/Dockerfile
index 59656339a..395c367e6 100644
--- a/.github/actions/build-docs/Dockerfile
+++ b/.github/actions/build-docs/Dockerfile
@@ -1,4 +1,5 @@
-FROM phpdoc/phpdoc
+# https://hub.docker.com/r/phpdoc/phpdoc
+FROM phpdoc/phpdoc:3.0
 
 LABEL "repository"="https://github.com/chillerlan/php-qrcode"
 
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 1369e8b65..27045f91f 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: "Checkout sources"
-        uses: actions/checkout@v2
+        uses: actions/checkout@master
         with:
           fetch-depth: 1
 
@@ -22,7 +22,7 @@ jobs:
         uses: ./.github/actions/build-docs
 
       - name: "Publish Docs to gh-pages"
-        uses: maxheld83/ghpages@v0.2.1
+        uses: maxheld83/ghpages@master
         env:
           BUILD_DIR: docs/
           GH_PAT: ${{ secrets.GH_PAT }}