diff --git a/.github/workflows/build-image.yml b/.github/workflows/build-image.yml
index a21821c..cc6fd3d 100644
--- a/.github/workflows/build-image.yml
+++ b/.github/workflows/build-image.yml
@@ -8,8 +8,6 @@ jobs:
     name: Build Docker Image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 1
+      - uses: actions/checkout@v3
       - name: Build Docker image
         run: docker build .
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 527898f..1604131 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 1
       - name: Run envsubst
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..85e7c1d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/.idea/
diff --git a/Dockerfile b/Dockerfile
index fa45b13..a0b3f76 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,13 @@
-FROM alpine:3.11.6
+FROM alpine:3.17
 
-LABEL version="1.0.1"
+LABEL version="1.0.2"
 LABEL maintainer="nownabe"
 LABEL com.github.actions.name="Simple Envsubst"
 LABEL com.github.actions.description="Substitutes the values of environment variables"
 LABEL com.github.actions.icon="file-text"
 LABEL com.github.actions.color="red"
 
-RUN apk add --update --no-cache gettext=0.20.1-r2
+RUN apk add --update --no-cache gettext=0.21.1-r1
 
 COPY ./entrypoint.sh /entrypoint.sh