diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
new file mode 100644
index 0000000..3404517
--- /dev/null
+++ b/.github/workflows/stale.yml
@@ -0,0 +1,19 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "30 1 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'Stale issue message'
+        stale-pr-message: 'Stale pull request message'
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
diff --git a/Dockerfile b/Dockerfile
index 0f456bf..e262bc6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8.5-alpine3.12
+FROM python:3.8.6-alpine3.12
 MAINTAINER Takuya Noguchi <takninnovationresearch@gmail.com>
 
 RUN apk add --update --no-cache mariadb-connector-c-dev \
diff --git a/README.md b/README.md
index 5cc0ec7..9f9dc5a 100644
--- a/README.md
+++ b/README.md
@@ -5,4 +5,4 @@
 
 powered by [![PyPI version](https://badge.fury.io/py/mysqlclient.svg)](https://badge.fury.io/py/mysqlclient)
 
-the mysqlclient Docker image (based on python:3.8.5-alpine3.12)
+the mysqlclient Docker image (based on python:3.8.6-alpine3.12)