diff --git a/ze/theia-slim/Dockerfile b/ze/theia-slim/Dockerfile
index cd574a9..1e6cba3 100644
--- a/ze/theia-slim/Dockerfile
+++ b/ze/theia-slim/Dockerfile
@@ -12,7 +12,10 @@ FROM node:${NODE_VERSION}-alpine
 RUN apk add --no-cache curl make pkgconfig gcc g++ python3 libx11-dev libxkbfile-dev libsecret-dev chromium
 WORKDIR /home/theia
 ADD buildPackageJson.js ./buildPackageJson.js
-RUN echo $(node buildPackageJson.js ${THEIA_VERSION}) > package.json
+RUN echo ${THEIA_VERSION} && node buildPackageJson.js ${THEIA_VERSION}
+RUN echo "$(node buildPackageJson.js ${THEIA_VERSION})"
+RUN echo "`node buildPackageJson.js ${THEIA_VERSION}`"
+RUN echo "$(node buildPackageJson.js ${THEIA_VERSION})" > package.json
 ARG GITHUB_TOKEN
 RUN yarn global add node-gyp && \
     yarn --pure-lockfile && \