diff --git a/docker/Dockerfile.agent.linux.amd64 b/docker/Dockerfile.agent.linux.amd64
index 210a8e7f..3dd9362d 100644
--- a/docker/Dockerfile.agent.linux.amd64
+++ b/docker/Dockerfile.agent.linux.amd64
@@ -1,7 +1,7 @@
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 ENV GODEBUG netdns=go
 ENV DRONE_RUNNER_OS=linux
 ENV DRONE_RUNNER_ARCH=amd64
diff --git a/docker/Dockerfile.controller.linux.amd64 b/docker/Dockerfile.controller.linux.amd64
index cf1db6fd..0a0953c9 100644
--- a/docker/Dockerfile.controller.linux.amd64
+++ b/docker/Dockerfile.controller.linux.amd64
@@ -1,7 +1,7 @@
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 ENV GODEBUG netdns=go
 ENV DRONE_RUNNER_OS=linux
 ENV DRONE_RUNNER_ARCH=amd64
diff --git a/docker/Dockerfile.controller.linux.arm b/docker/Dockerfile.controller.linux.arm
index 873ee782..e5af6e16 100644
--- a/docker/Dockerfile.controller.linux.arm
+++ b/docker/Dockerfile.controller.linux.arm
@@ -1,7 +1,7 @@
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 ENV GODEBUG=netdns=go
 ENV DRONE_RUNNER_OS=linux
 ENV DRONE_RUNNER_ARCH=arm
diff --git a/docker/Dockerfile.controller.linux.arm64 b/docker/Dockerfile.controller.linux.arm64
index 54afa687..d872c2dc 100644
--- a/docker/Dockerfile.controller.linux.arm64
+++ b/docker/Dockerfile.controller.linux.arm64
@@ -1,7 +1,7 @@
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 ENV GODEBUG=netdns=go
 ENV DRONE_RUNNER_OS=linux
 ENV DRONE_RUNNER_ARCH=arm64
diff --git a/docker/Dockerfile.server.linux.amd64 b/docker/Dockerfile.server.linux.amd64
index cbbb948b..3e669ca1 100644
--- a/docker/Dockerfile.server.linux.amd64
+++ b/docker/Dockerfile.server.linux.amd64
@@ -1,9 +1,9 @@
 # docker build --rm -f docker/Dockerfile -t drone/drone .
 
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 EXPOSE 80 443
 VOLUME /data
 
diff --git a/docker/Dockerfile.server.linux.arm b/docker/Dockerfile.server.linux.arm
index de704837..1b6ce60b 100644
--- a/docker/Dockerfile.server.linux.arm
+++ b/docker/Dockerfile.server.linux.arm
@@ -1,9 +1,9 @@
 # docker build --rm -f docker/Dockerfile -t drone/drone .
 
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 EXPOSE 80 443
 VOLUME /data
 
diff --git a/docker/Dockerfile.server.linux.arm64 b/docker/Dockerfile.server.linux.arm64
index d0969426..b83678b1 100644
--- a/docker/Dockerfile.server.linux.arm64
+++ b/docker/Dockerfile.server.linux.arm64
@@ -1,9 +1,9 @@
 # docker build --rm -f docker/Dockerfile -t drone/drone .
 
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 RUN apk add -U --no-cache ca-certificates
 
-FROM alpine:3.9
+FROM alpine:3.11
 EXPOSE 80 443
 VOLUME /data