diff --git a/curl/Dockerfile b/curl/Dockerfile
index 7b190b91..17233a83 100644
--- a/curl/Dockerfile
+++ b/curl/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.18
 
 RUN apk --no-cache add curl ca-certificates jq && \
     update-ca-certificates
diff --git a/docker-cleanup/Dockerfile b/docker-cleanup/Dockerfile
index 884d6c45..4709e20a 100644
--- a/docker-cleanup/Dockerfile
+++ b/docker-cleanup/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.5
+FROM alpine:3.18
 
 # Generic docker-cleanup tool
 # Currently runs docker-gc & removes dangling volumes
diff --git a/docker-gc-cron/Dockerfile b/docker-gc-cron/Dockerfile
index c6a0b288..2b4dd6e9 100755
--- a/docker-gc-cron/Dockerfile
+++ b/docker-gc-cron/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.5
+FROM alpine:3.18
 
 # Fork of https://github.com/clockworksoul/docker-gc-cron
 
diff --git a/flow/Dockerfile b/flow/Dockerfile
index 539e3310..06c59c0d 100644
--- a/flow/Dockerfile
+++ b/flow/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.18
 
 ENV FLOW_VERSION=0.57.3
 
diff --git a/gitlab-pipeline-checker/Dockerfile b/gitlab-pipeline-checker/Dockerfile
index b3e8f56e..891d4324 100644
--- a/gitlab-pipeline-checker/Dockerfile
+++ b/gitlab-pipeline-checker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.9
+FROM alpine:3.18
 
 ENV VERSION=1.0
 
diff --git a/s3-sftp/Dockerfile b/s3-sftp/Dockerfile
index b4e8f1e3..90415b43 100644
--- a/s3-sftp/Dockerfile
+++ b/s3-sftp/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.5
+FROM alpine:3.18
 
 ARG S3FS_VERSION=v1.82
 
diff --git a/tox/Dockerfile b/tox/Dockerfile
index 8bbf844b..9f34bae5 100644
--- a/tox/Dockerfile
+++ b/tox/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15.4
+FROM alpine:3.18.4
 
 ENV PATH="$PATH:/root/.pyenv/bin:/root/.pyenv/shims"
 ENV version=3.25.0