diff --git a/infrastructure/loadtesting/terraform/docker/loadtest.Dockerfile b/infrastructure/loadtesting/terraform/docker/loadtest.Dockerfile
index e97c4d10be..01a67cf6b0 100644
--- a/infrastructure/loadtesting/terraform/docker/loadtest.Dockerfile
+++ b/infrastructure/loadtesting/terraform/docker/loadtest.Dockerfile
@@ -3,7 +3,7 @@ ARG TAG
 RUN apk add git
 RUN git clone -b $TAG --depth=1 --no-tags --progress --no-recurse-submodules https://github.com/fleetdm/fleet.git && cd /go/fleet/cmd/osquery-perf/ && go build .
 
-FROM alpine:3.21@sha256:2c43f33bd1502ec7818bce9eea60e062d04eeadc4aa31cad9dabecb1e48b647b
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 LABEL maintainer="Fleet Developers"
 
 # Create FleetDM group and user
diff --git a/server/mdm/scep/Dockerfile b/server/mdm/scep/Dockerfile
index 89e0abca6d..d82f4ff912 100644
--- a/server/mdm/scep/Dockerfile
+++ b/server/mdm/scep/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 
 COPY ./scepclient-linux-amd64 /usr/bin/scepclient
 COPY ./scepserver-linux-amd64 /usr/bin/scepserver
diff --git a/tools/fleet-docker/Dockerfile b/tools/fleet-docker/Dockerfile
index 506b901628..5f80596651 100644
--- a/tools/fleet-docker/Dockerfile
+++ b/tools/fleet-docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21@sha256:2c43f33bd1502ec7818bce9eea60e062d04eeadc4aa31cad9dabecb1e48b647b
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 LABEL maintainer="Fleet Developers"
 
 RUN apk --update add ca-certificates
diff --git a/tools/mdm/migration/mdmproxy/Dockerfile b/tools/mdm/migration/mdmproxy/Dockerfile
index 852f7d31e5..506d7a07b3 100644
--- a/tools/mdm/migration/mdmproxy/Dockerfile
+++ b/tools/mdm/migration/mdmproxy/Dockerfile
@@ -3,7 +3,7 @@ ARG TAG
 RUN apk update && apk add --no-cache git
 RUN git clone -b $TAG --depth=1 --no-tags --progress --no-recurse-submodules https://github.com/fleetdm/fleet.git && cd /go/fleet/tools/mdm/migration/mdmproxy && go build .
 
-FROM alpine:3.21@sha256:2c43f33bd1502ec7818bce9eea60e062d04eeadc4aa31cad9dabecb1e48b647b
+FROM alpine:3.21.3@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 LABEL maintainer="Fleet Developers"
 
 RUN apk update && apk add --no-cache tini