diff --git a/Dockerfile b/Dockerfile
index 7bdc6f9bc..670eda9e5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.15.4
 
 RUN apk add --no-cache bash
 RUN adduser --system --disabled-password cxuser
diff --git a/test/integration/data/Dockerfile b/test/integration/data/Dockerfile
index c0a00af0f..210f972d7 100644
--- a/test/integration/data/Dockerfile
+++ b/test/integration/data/Dockerfile
@@ -1,6 +1,6 @@
 # Example: docker build . -t dsvw && docker run -p 65412:65412 dsvw
 
-FROM alpine:latest
+FROM alpine:3.15.4
 
 RUN apk --no-cache add git python3 py-lxml \
     && rm -rf /var/cache/apk/*