diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 3df419b..23cae9a 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -2,7 +2,7 @@
     "name": "100 knocks Ruby",
     "build": {
         "dockerfile": "Dockerfile",
-        "cacheFrom": "ghcr.io/heronshoes/100knocks-preprocess-ruby"
+        "cacheFrom": "ghcr.io/tikkss/100knocks-preprocess-ruby"
     },
     "features": {
         "ghcr.io/devcontainers/features/python:1": {
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 09120f2..a536e0f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Pre-build image and run make ci-build in dev container
         uses: devcontainers/ci@v0.3
         with:
-          imageName: ghcr.io/heronshoes/100knocks-preprocess-ruby
-          cacheFrom: ghcr.io/heronshoes/100knocks-preprocess-ruby
+          imageName: ghcr.io/tikkss/100knocks-preprocess-ruby
+          cacheFrom: ghcr.io/tikkss/100knocks-preprocess-ruby
           push: always
           runCmd: bundle install && rake test
diff --git a/doc/qmd/preprocess_knock_Ruby-RedAmber.qmd b/doc/qmd/preprocess_knock_Ruby-RedAmber.qmd
index f0e76e9..448982d 100644
--- a/doc/qmd/preprocess_knock_Ruby-RedAmber.qmd
+++ b/doc/qmd/preprocess_knock_Ruby-RedAmber.qmd
@@ -7,7 +7,6 @@ format:
     toc-title: Contents
     number-sections: true
     colorlinks: true
-lang: ja
 pdf-engine: lualatex
 documentclass: ltjsarticle
 highlight-style: github
diff --git a/doc/qmd/preprocess_knock_Ruby-RedAmber_questions.qmd b/doc/qmd/preprocess_knock_Ruby-RedAmber_questions.qmd
index 55a62ca..2c7f331 100644
--- a/doc/qmd/preprocess_knock_Ruby-RedAmber_questions.qmd
+++ b/doc/qmd/preprocess_knock_Ruby-RedAmber_questions.qmd
@@ -7,7 +7,6 @@ format:
     toc-title: Contents
     number-sections: true
     colorlinks: true
-lang: ja
 pdf-engine: lualatex
 documentclass: ltjsarticle
 highlight-style: github