diff --git a/Dockerfile b/Dockerfile
index 5d353bf..ee4e519 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,11 @@
 # Using Alpine to keep the images smaller
 # Change to using the official NodeJS Alpine container
-FROM node:16-alpine
+FROM node:18-alpine
 
 # Pushing all files into image
+ENV SEMAPHORE_VERSION=1.0.0
 WORKDIR /app
-RUN wget -q https://github.com/NickColley/semaphore/archive/refs/tags/1.0.0.tar.gz \
+RUN wget -q "https://github.com/NickColley/semaphore/archive/refs/tags/$SEMAPHORE_VERSION.tar.gz" \
 	     -O /tmp/semaphore.tar.gz \
  && tar xavf /tmp/semaphore.tar.gz --strip-components 1 \
  && rm -f /tmp/semaphore.tar.gz