diff --git a/Dockerfile b/Dockerfile
index 7c83621..203ad5b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ FROM golang:alpine as builder
 # envsubst from gettext can not replace env vars with default values
 # this package is not available for ARM32 and we have to build it from source code
 # flag -ldflags "-s -w" produces a smaller executable
-RUN go install -ldflags "-s -w" -v github.com/a8m/envsubst/cmd/envsubst@v1.3.0
+RUN go install -ldflags "-s -w" -v github.com/a8m/envsubst/cmd/envsubst@v1.4.3
 
 FROM alpine:3.18