diff --git a/Dockerfile b/Dockerfile
index 4fd6f2b..8b7eae7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM node:16 AS frontend-builder
 COPY ./maubot/management/frontend /frontend
 RUN cd /frontend && yarn --prod && yarn build
 
-FROM alpine:3.14
+FROM alpine:3.15
 
 RUN apk add --no-cache \
         python3 py3-pip py3-setuptools py3-wheel \
diff --git a/Dockerfile.ci b/Dockerfile.ci
index 47655a0..8c0f49b 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -1,4 +1,4 @@
-FROM alpine:3.14
+FROM alpine:3.15
 
 RUN apk add --no-cache \
         python3 py3-pip py3-setuptools py3-wheel \
diff --git a/maubot/standalone/Dockerfile b/maubot/standalone/Dockerfile
index ebe156a..0f89025 100644
--- a/maubot/standalone/Dockerfile
+++ b/maubot/standalone/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/alpine:3.14
+FROM docker.io/alpine:3.15
 
 RUN apk add --no-cache \
       python3 py3-pip py3-setuptools py3-wheel \