diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..1a218f5
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,15 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: ".github/workflows" # Location of package manifests
+    schedule:
+      interval: "monthly"
+    groups:
+      actions:
+        patterns:
+          - "*"
diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index 8d45df3..d9eeb03 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -20,9 +20,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938  # v4.2.0
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3  # v5.2.0
       with:
         python-version: '3.x'
     - name: Lint with flake8
@@ -38,9 +38,9 @@ jobs:
         os: [windows-latest, macos-latest, ubuntu-latest]
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938  # v4.2.0
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3  # v5.2.0
       with:
         python-version: '3.10'
     - name: Install and build
@@ -52,9 +52,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938  # v4.2.0
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3  # v5.2.0
       with:
         python-version: '3.11'
     - name: Install and build
diff --git a/.github/workflows/predeps_workflow.yml b/.github/workflows/predeps_workflow.yml
index 2af893d..b2d7c5a 100644
--- a/.github/workflows/predeps_workflow.yml
+++ b/.github/workflows/predeps_workflow.yml
@@ -19,9 +19,9 @@ jobs:
         os: [windows-latest, macos-latest, ubuntu-latest]
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938  # v4.2.0
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3  # v5.2.0
       with:
         python-version: '3.10'
     - name: Install and build
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index a9bab55..89839b2 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -10,10 +10,10 @@ jobs:
     if: github.repository == 'astropy/astrowidgets'
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938  # v4.2.0
       with:
         fetch-depth: 0
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3  # v5.2.0
       with:
         python-version: 3.8
 
@@ -31,7 +31,7 @@ jobs:
 
     - name: Publish distribution 📦 to PyPI
       if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-      uses: pypa/gh-action-pypi-publish@release/v1
+      uses: pypa/gh-action-pypi-publish@897895f1e160c830e369f9779632ebc134688e1b  # v1.10.2
       with:
         user: __token__
         password: ${{ secrets.PYPI_TOKEN }}
diff --git a/.readthedocs.yml b/.readthedocs.yaml
similarity index 76%
rename from .readthedocs.yml
rename to .readthedocs.yaml
index f88ffa6..ce73bf1 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yaml
@@ -2,19 +2,19 @@
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 version: 2
 
+build:
+  os: ubuntu-22.04
+  apt_packages:
+    - graphviz
+  tools:
+    python: "3.11"
+
 sphinx:
   builder: html
   configuration: docs/conf.py
   fail_on_warning: true
 
-# Set the version of Python and requirements required to build your docs
-build:
-  os: ubuntu-22.04
-  tools:
-    python: "3.10"
-
 python:
-  system_packages: false
   install:
     - method: pip
       path: .