diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..9c39a86
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,16 @@
+# 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/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index b0e8f86..36d0a36 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   publish:
-    uses: spacetelescope/action-publish_to_pypi/.github/workflows/workflow.yml@master
+    uses: spacetelescope/action-publish_to_pypi/.github/workflows/workflow.yml@db1a5633a75b441416f9bf6790ae78fb5f3bf970  # 1.2.4
     with:
       test: false
       build_platform_wheels: false  # Set to true if your package contains a C extension
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index de68ef6..eba0ba9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,12 +16,12 @@ concurrency:
 
 jobs:
   check:
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@924441154cf3053034c6513d5e06c69d262fb9a6  # v1.13.0
     with:
       envs: |
         - linux: check-style
   test:
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@924441154cf3053034c6513d5e06c69d262fb9a6  # v1.13.0
     with:
       envs: |
         - linux: py39
diff --git a/.github/workflows/tests_scheduled.yml b/.github/workflows/tests_scheduled.yml
index 6cb81b0..004042d 100644
--- a/.github/workflows/tests_scheduled.yml
+++ b/.github/workflows/tests_scheduled.yml
@@ -21,7 +21,7 @@ concurrency:
 jobs:
   test:
     if: (github.repository == 'spacetelescope/costools' && (github.event_name == 'schedule' || github.event_name == 'push' || github.event_name == 'workflow_dispatch' || contains(github.event.pull_request.labels.*.name, 'Weekly CI')))
-    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
+    uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@924441154cf3053034c6513d5e06c69d262fb9a6  # v1.13.0
     with:
       envs: |
         - linux: py3-devdeps-xdist