diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 22f32976..6e45c7a3 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:4.0.5
+FROM ruby:4.0.6
 
 ARG USERNAME=app
 ARG USER_UID=1000
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index bbd79b14..58d5332a 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -27,7 +27,7 @@ jobs:
           ref: ${{ matrix.ref }}
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.5"
+          ruby-version: "4.0.6"
           bundler-cache: true
       - uses: actions/github-script@v9
         with:
diff --git a/.github/workflows/generator.yml b/.github/workflows/generator.yml
index 53a915bd..c3302e2d 100644
--- a/.github/workflows/generator.yml
+++ b/.github/workflows/generator.yml
@@ -16,7 +16,7 @@ jobs:
       - run: git submodule update --init
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.5"
+          ruby-version: "4.0.6"
           bundler-cache: true
       - run: bin/generate_files
       - run: git diff --exit-code
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 470a8b52..ba34edc7 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -17,6 +17,6 @@ jobs:
           persist-credentials: false
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.5"
+          ruby-version: "4.0.6"
           bundler-cache: true
       - uses: rubygems/release-gem@v1
diff --git a/.github/workflows/steep.yml b/.github/workflows/steep.yml
index 186cc0b2..d8112545 100644
--- a/.github/workflows/steep.yml
+++ b/.github/workflows/steep.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.5"
+          ruby-version: "4.0.6"
           bundler-cache: true
       - run: gem update --system
       - run: bundle exec steep check