diff --git a/Dockerfile b/Dockerfile
index 328e30c..a5e19a0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,12 @@
 FROM openjdk:17-alpine
+
 ENV REVIEWDOG_VERSION=v0.14.1
+
 RUN wget -O - -q https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b /usr/local/bin/ ${REVIEWDOG_VERSION}
+RUN wget -q https://github.com/pmd/pmd/releases/download/pmd_releases%2F6.51.0/pmd-bin-6.51.0.zip \
+ && unzip pmd-bin-6.51.0.zip
+
 RUN apk add --no-cache git
-COPY entrypoint.sh /entrypoint.sh
 
+COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
diff --git a/LICENSE b/LICENSE
index 383b8a5..8d28065 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 reviewdog developers
+Copyright (c) 2022 kemsakurai
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index a3d0322..eef46c9 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ jobs:
     name: PMD job
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Run PMD
       uses: kemsakurai/action-pmd@master
       with:
diff --git a/entrypoint.sh b/entrypoint.sh
index f9bb0e6..b160402 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -11,11 +11,7 @@ export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 printenv
 ls
 
-# fetch pmd of a requested version
-wget -q "https://github.com/pmd/pmd/releases/download/pmd_releases%2F6.51.0/pmd-bin-6.51.0.zip"
-unzip pmd-bin-6.51.0.zip
-
-exec /bin/sh ./pmd-bin-6.51.0/bin/run.sh pmd -d "${INPUT_SRC_PATH}" -R "${INPUT_RULESETS_PATH}" -f emacs \
+exec /bin/sh /pmd-bin-6.51.0/bin/run.sh pmd -d "${INPUT_SRC_PATH}" -R "${INPUT_RULESETS_PATH}" -f emacs \
   | reviewdog -efm="%f:%l: %m" \
       -name="${INPUT_TOOL_NAME}" \
       -reporter="${INPUT_REPORTER:-github-pr-check}" \