diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 00000000..e33811f6
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,7 @@
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
diff --git a/.github/workflows/c.yml b/.github/workflows/c.yml
index e9e71bc8..1273301c 100644
--- a/.github/workflows/c.yml
+++ b/.github/workflows/c.yml
@@ -8,6 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - uses: Kesin11/actions-timeline@v2
     - uses: actions/checkout@v3
     - name: preparation
       run: |
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 8243ff1e..59c4820a 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -29,6 +29,8 @@ jobs:
         # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection
 
     steps:
+    - uses: Kesin11/actions-timeline@v2
+
     - name: Checkout repository
       uses: actions/checkout@v2
       with: