diff --git a/Dockerfile b/Dockerfile
index 4ae548f..8e0a3a0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20-slim
+FROM node:18-slim
 
 LABEL version="1.0.0"
 LABEL repository="http://github.com/Github-Actions-Community/merge-release"
@@ -12,14 +12,12 @@ LABEL com.github.actions.color="red"
 
 RUN apt-get -y update && \
   apt-get -y --no-install-recommends install git jq findutils curl ca-certificates && \
-  rm -rf /var/lib/apt/lists/* && \
-  npm update -g npm
+  rm -rf /var/lib/apt/lists/*
 
-WORKDIR /usr/app
-COPY ./ ./
+COPY . .
 
 # Install dependencies here
 RUN npm ci --omit dev
 
-ENTRYPOINT ["/usr/app/entrypoint.sh"]
+ENTRYPOINT ["/entrypoint.sh"]
 CMD ["help"]
diff --git a/entrypoint.sh b/entrypoint.sh
index faefc69..6fcf641 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -3,21 +3,21 @@
 set -e
 
 # Map the inputs over to the environment variables to support both `env` and `with` methods for backwards-compatibility
-export DEBUG=${INPUT_DEBUG:-"$DEBUG"}
-export DEPLOY_DIR=${INPUT_DEPLOY_DIR:-"$DEPLOY_DIR"}
-export DISABLE_GIT_TAG=${INPUT_DISABLE_GIT_TAG:-"$DISABLE_GIT_TAG"}
-export GIT_TAG_SUFFIX=${INPUT_GIT_TAG_SUFFIX:-"$GIT_TAG_SUFFIX"}
-export GITHUB_ACTOR=${INPUT_GITHUB_ACTOR:-"$GITHUB_ACTOR"}
-export GITHUB_REPOSITORY=${INPUT_GITHUB_REPOSITORY:-"$GITHUB_REPOSITORY"}
-export GITHUB_TOKEN=${INPUT_GITHUB_TOKEN:-"$GITHUB_TOKEN"}
-export MAJOR_TAGS=${INPUT_MAJOR_TAGS:-"$MAJOR_TAGS"}
-export MINOR_TAGS=${INPUT_MINOR_TAGS:-"$MINOR_TAGS"}
-export NPM_AUTH_TOKEN=${INPUT_NPM_AUTH_TOKEN:-"$NPM_AUTH_TOKEN"}
-export NPM_CONFIG_USERCONFIG=${INPUT_NPM_CONFIG_USERCONFIG:-"$NPM_CONFIG_USERCONFIG"}
-export NPM_CUSTOM_NPMRC=${INPUT_NPM_CUSTOM_NPMRC:-"$NPM_CUSTOM_NPMRC"}
-export NPM_PRIVATE=${INPUT_NPM_PRIVATE:-"$NPM_PRIVATE"}
-export NPM_REGISTRY_URL=${INPUT_NPM_REGISTRY_URL:-"$NPM_REGISTRY_URL"}
-export SRC_PACKAGE_DIR=${INPUT_SRC_PACKAGE_DIR:-"$SRC_PACKAGE_DIR"}
+export DEBUG="${INPUT_DEBUG:-"$DEBUG"}"
+export DEPLOY_DIR="${INPUT_DEPLOY_DIR:-"$DEPLOY_DIR"}"
+export DISABLE_GIT_TAG="${INPUT_DISABLE_GIT_TAG:-"$DISABLE_GIT_TAG"}"
+export GIT_TAG_SUFFIX="${INPUT_GIT_TAG_SUFFIX:-"$GIT_TAG_SUFFIX"}"
+export GITHUB_ACTOR="${INPUT_GITHUB_ACTOR:-"$GITHUB_ACTOR"}"
+export GITHUB_REPOSITORY="${INPUT_GITHUB_REPOSITORY:-"$GITHUB_REPOSITORY"}"
+export GITHUB_TOKEN="${INPUT_GITHUB_TOKEN:-"$GITHUB_TOKEN"}"
+export MAJOR_TAGS="${INPUT_MAJOR_TAGS:-"$MAJOR_TAGS"}"
+export MINOR_TAGS="${INPUT_MINOR_TAGS:-"$MINOR_TAGS"}"
+export NPM_AUTH_TOKEN="${INPUT_NPM_AUTH_TOKEN:-"$NPM_AUTH_TOKEN"}"
+export NPM_CONFIG_USERCONFIG="${INPUT_NPM_CONFIG_USERCONFIG:-"$NPM_CONFIG_USERCONFIG"}"
+export NPM_CUSTOM_NPMRC="${INPUT_NPM_CUSTOM_NPMRC:-"$NPM_CUSTOM_NPMRC"}"
+export NPM_PRIVATE="${INPUT_NPM_PRIVATE:-"$NPM_PRIVATE"}"
+export NPM_REGISTRY_URL="${INPUT_NPM_REGISTRY_URL:-"$NPM_REGISTRY_URL"}"
+export SRC_PACKAGE_DIR="${INPUT_SRC_PACKAGE_DIR:-"$SRC_PACKAGE_DIR"}"
 
 # Set default values
 NPM_STRICT_SSL="${NPM_STRICT_SSL-true}"
@@ -26,10 +26,10 @@ if ! $NPM_STRICT_SSL; then
   NPM_REGISTRY_SCHEME="http"
 fi
 NPM_REGISTRY_URL="${NPM_REGISTRY_SCHEME}://"$(echo "${NPM_REGISTRY_URL:-registry.npmjs.org}" | sed -r 's/https?:\/\///')
-MINOR_TAGS=${MINOR_TAGS:-"feat"}
-DEPLOY_DIR=${DEPLOY_DIR:-"."}
-SRC_PACKAGE_DIR=${SRC_PACKAGE_DIR:-"."}
-NPM_CONFIG_USERCONFIG=${NPM_CONFIG_USERCONFIG:-"$HOME/.npmrc"}
+MINOR_TAGS="${MINOR_TAGS:-"feat"}"
+DEPLOY_DIR="${DEPLOY_DIR:-"."}"
+SRC_PACKAGE_DIR="${SRC_PACKAGE_DIR:-"."}"
+NPM_CONFIG_USERCONFIG="${NPM_CONFIG_USERCONFIG:-"$HOME/.npmrc"}"
 
 if [ "$DEBUG" = "true" ]; then
   echo "Debug Enabled, Printing Environment:"
@@ -40,13 +40,13 @@ fi
 if [ -n "$NPM_CUSTOM_NPMRC" ]; then
   # Use a fully-formed npmrc file if provided
   echo "$NPM_CUSTOM_NPMRC" > "$NPM_CONFIG_USERCONFIG"
+  chmod 0600 "$NPM_CONFIG_USERCONFIG"
 elif [ -n "$NPM_AUTH_TOKEN" ]; then
   # Allow registry.npmjs.org to be overridden with an environment variable
   printf "//%s/:_authToken=%s\\nregistry=%s\\nstrict-ssl=%s" "$NPM_REGISTRY_URL" "$NPM_AUTH_TOKEN" "$NPM_REGISTRY_URL" "${NPM_STRICT_SSL}" > "$NPM_CONFIG_USERCONFIG"
+  chmod 0600 "$NPM_CONFIG_USERCONFIG"
 fi
 
-chmod 0600 "$NPM_CONFIG_USERCONFIG"
-
 if [ "$DEBUG" = "true" ]; then
   echo "Debug Enabled, Printing '$NPM_CONFIG_USERCONFIG' file contents:"
   cat "$NPM_CONFIG_USERCONFIG"
@@ -65,4 +65,4 @@ git show-ref # useful for debugging
 git branch --verbose
 
 # Dependencies are installed at build time
-node /usr/app/src/merge-release-run.js "$@" || exit 1
+node /src/merge-release-run.js "$@" || exit 1
diff --git a/src/merge-release-run.js b/src/merge-release-run.js
index 63cd8db..33e8d6d 100644
--- a/src/merge-release-run.js
+++ b/src/merge-release-run.js
@@ -186,7 +186,7 @@ const run = async () => {
 
   console.log('   New Version:', newVersion);
 
-  if (pkg.scripts && pkg.scripts.publish) {
+  if (pkg?.scripts?.publish) {
     spawnSync(`npm run publish`, deployDir);
   } else {
     const verbose = debug ? ' --verbose' : '';