diff --git a/Dockerfile b/Dockerfile
index 791a922..832137b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ ENV GOBIN /out
 RUN cd /doctree && go install ./cmd/doctree
 
 # Dockerfile based on guidelines at https://github.com/hexops/dockerfile
-FROM alpine:3.16@sha256:686d8c9dfa6f3ccfc8230bc3178d23f84eeaf7e457f36f271ab1acc53015037c
+FROM alpine:3.16@sha256:7d50a75057e328af8451431c4bd28cdf20f71f5607930f2d254433d09b44566d
 
 # Non-root user for security purposes.
 #