diff --git a/Dockerfile.agent.alpine b/Dockerfile.agent.alpine
index eac573ebd..10c7252bd 100644
--- a/Dockerfile.agent.alpine
+++ b/Dockerfile.agent.alpine
@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.9.4
 
 RUN apk add -U --no-cache ca-certificates
 
diff --git a/Dockerfile.agent.linux.arm b/Dockerfile.agent.linux.arm
deleted file mode 100644
index ca5ea0253..000000000
--- a/Dockerfile.agent.linux.arm
+++ /dev/null
@@ -1,9 +0,0 @@
-FROM drone/ca-certs
-ENV GODEBUG=netdns=go
-ENV DRONE_PLATFORM=linux/arm
-ADD release/linux/arm/drone-agent /bin/
-
-EXPOSE 3000
-HEALTHCHECK CMD ["/bin/drone-agent", "ping"]
-
-ENTRYPOINT ["/bin/drone-agent"]
diff --git a/Dockerfile.agent.linux.arm64 b/Dockerfile.agent.linux.arm64
deleted file mode 100644
index 0c4371970..000000000
--- a/Dockerfile.agent.linux.arm64
+++ /dev/null
@@ -1,9 +0,0 @@
-FROM drone/ca-certs
-ENV GODEBUG=netdns=go
-ENV DRONE_PLATFORM=linux/arm64
-ADD release/linux/arm64/drone-agent /bin/
-
-EXPOSE 3000
-HEALTHCHECK CMD ["/bin/drone-agent", "ping"]
-
-ENTRYPOINT ["/bin/drone-agent"]
diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index 2d7047220..a87da8f16 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.9.4
 EXPOSE 8000 9000 80 443
 
 RUN apk add -U --no-cache ca-certificates