diff --git a/docker/Dockerfile.linux.amd64 b/docker/Dockerfile.linux.amd64
index 18c80a0..1fe100a 100644
--- a/docker/Dockerfile.linux.amd64
+++ b/docker/Dockerfile.linux.amd64
@@ -1,4 +1,4 @@
-FROM plugins/base:multiarch
+FROM plugins/base:multiarch@sha256:f9329cd6440a3715be16ba46c92d635558d8d678ef01ea3e5b3c98dabc781c14
 
 LABEL maintainer="Drone.IO Community <drone-dev@googlegroups.com>" \
   org.label-schema.name="Drone Matrix" \
diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
index db0b28e..3247c08 100644
--- a/docker/Dockerfile.linux.arm64
+++ b/docker/Dockerfile.linux.arm64
@@ -1,4 +1,4 @@
-FROM plugins/base:multiarch
+FROM plugins/base:multiarch@sha256:f9329cd6440a3715be16ba46c92d635558d8d678ef01ea3e5b3c98dabc781c14
 
 LABEL maintainer="Drone.IO Community <drone-dev@googlegroups.com>" \
   org.label-schema.name="Drone Matrix" \
diff --git a/docker/Dockerfile.windows.1809 b/docker/Dockerfile.windows.1809
index c081a66..f4b9c65 100644
--- a/docker/Dockerfile.windows.1809
+++ b/docker/Dockerfile.windows.1809
@@ -1,5 +1,5 @@
 # escape=`
-FROM plugins/base:windows-1809-amd64
+FROM plugins/base:windows-1809-amd64@sha256:17abe487127c95e081d88dc40aff30649c031255be84a7d5bdcbf08712c7f5c6
 
 LABEL maintainer="Drone.IO Community <drone-dev@googlegroups.com>" `
   org.label-schema.name="Drone Matrix" `