diff --git a/.github/ISSUE_TEMPLATE/2.server_bug_report.yml b/.github/ISSUE_TEMPLATE/2.server_bug_report.yml
index 467df3ef7d9..f5abb861e4e 100644
--- a/.github/ISSUE_TEMPLATE/2.server_bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/2.server_bug_report.yml
@@ -59,7 +59,7 @@ body:
         Any additional technical details you may have, like logs or error traces
       value: |
         If this is happening on your own Mastodon server, please fill out those:
-        - Ruby version: (from `ruby --version`, eg. v4.0.2)
+        - Ruby version: (from `ruby --version`, eg. v4.0.3)
         - Node.js version: (from `node --version`, eg. v22.16.0)
     validations:
       required: false
diff --git a/.github/ISSUE_TEMPLATE/3.troubleshooting.yml b/.github/ISSUE_TEMPLATE/3.troubleshooting.yml
index 9210e99b438..95efe3fd3cf 100644
--- a/.github/ISSUE_TEMPLATE/3.troubleshooting.yml
+++ b/.github/ISSUE_TEMPLATE/3.troubleshooting.yml
@@ -61,7 +61,7 @@ body:
       value: |
         Please at least include those informations:
         - Operating system: (eg. Ubuntu 24.04.2)
-        - Ruby version: (from `ruby --version`, eg. v4.0.2)
+        - Ruby version: (from `ruby --version`, eg. v4.0.3)
         - Node.js version: (from `node --version`, eg. v22.16.0)
     validations:
       required: false
diff --git a/.github/actions/setup-ruby/action.yml b/.github/actions/setup-ruby/action.yml
index 9f50aa60ffa..317c1256d51 100644
--- a/.github/actions/setup-ruby/action.yml
+++ b/.github/actions/setup-ruby/action.yml
@@ -17,7 +17,7 @@ runs:
         sudo apt-get install --no-install-recommends -y libicu-dev libidn11-dev libvips42 ${{ inputs.additional-system-dependencies }}
 
     - name: Set up Ruby
-      uses: ruby/setup-ruby@c984c1a20bb35a1cbda04477c816cea024418be9 # v1
+      uses: ruby/setup-ruby@94e4d89d3e6c1c7599e0210d114c5ffb23f1a866 # v1
       with:
         ruby-version: ${{ inputs.ruby-version }}
         bundler-cache: true
diff --git a/.github/workflows/bundler-audit.yml b/.github/workflows/bundler-audit.yml
index 964d93378d3..0cbbeb58789 100644
--- a/.github/workflows/bundler-audit.yml
+++ b/.github/workflows/bundler-audit.yml
@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@c984c1a20bb35a1cbda04477c816cea024418be9 # v1
+        uses: ruby/setup-ruby@94e4d89d3e6c1c7599e0210d114c5ffb23f1a866 # v1
         with:
           bundler-cache: true
 
diff --git a/.github/workflows/lint-haml.yml b/.github/workflows/lint-haml.yml
index 33dc4e4fb64..b59a4b2d69b 100644
--- a/.github/workflows/lint-haml.yml
+++ b/.github/workflows/lint-haml.yml
@@ -36,7 +36,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@c984c1a20bb35a1cbda04477c816cea024418be9 # v1
+        uses: ruby/setup-ruby@94e4d89d3e6c1c7599e0210d114c5ffb23f1a866 # v1
         with:
           bundler-cache: true
 
diff --git a/.github/workflows/lint-ruby.yml b/.github/workflows/lint-ruby.yml
index b68f50e033e..ae4cc6faf26 100644
--- a/.github/workflows/lint-ruby.yml
+++ b/.github/workflows/lint-ruby.yml
@@ -38,7 +38,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@c984c1a20bb35a1cbda04477c816cea024418be9 # v1
+        uses: ruby/setup-ruby@94e4d89d3e6c1c7599e0210d114c5ffb23f1a866 # v1
         with:
           bundler-cache: true
 
diff --git a/.ruby-version b/.ruby-version
index 4d54daddb61..c4e41f94594 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.2
+4.0.3