diff --git a/.github/workflows/build-artifacts.yml b/.github/workflows/build-artifacts.yml
index ec57121d3c..d1504b8adc 100644
--- a/.github/workflows/build-artifacts.yml
+++ b/.github/workflows/build-artifacts.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/cpp-bindings.yml b/.github/workflows/cpp-bindings.yml
index 12176470a5..7ac2c068dc 100644
--- a/.github/workflows/cpp-bindings.yml
+++ b/.github/workflows/cpp-bindings.yml
@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/cruby-bindings.yml b/.github/workflows/cruby-bindings.yml
index 23e62968b4..1312293c32 100644
--- a/.github/workflows/cruby-bindings.yml
+++ b/.github/workflows/cruby-bindings.yml
@@ -19,7 +19,7 @@ jobs:
         with:
           ruby-version: head
           bundler: none
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: ruby/ruby
           path: ruby/ruby
@@ -29,7 +29,7 @@ jobs:
           set -x
           sudo apt-get update -q || :
           sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev autoconf ruby
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           path: ruby/prism
           fetch-depth: 1
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 785fa409c9..8f9b6901f7 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -14,7 +14,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/.github/workflows/github-pages.yml b/.github/workflows/github-pages.yml
index 96174d2a67..179b7ed867 100644
--- a/.github/workflows/github-pages.yml
+++ b/.github/workflows/github-pages.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/java-wasm-bindings.yml b/.github/workflows/java-wasm-bindings.yml
index b3e427add0..ece0914f2f 100644
--- a/.github/workflows/java-wasm-bindings.yml
+++ b/.github/workflows/java-wasm-bindings.yml
@@ -15,7 +15,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/javascript-bindings.yml b/.github/workflows/javascript-bindings.yml
index fc91523a64..6431e5472c 100644
--- a/.github/workflows/javascript-bindings.yml
+++ b/.github/workflows/javascript-bindings.yml
@@ -15,7 +15,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7e2378c01b..91277ae018 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -28,7 +28,7 @@ jobs:
     env:
       BUNDLE_GEMFILE: gemfiles/2.7/Gemfile
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -44,7 +44,7 @@ jobs:
     env:
       BUNDLE_GEMFILE: gemfiles/typecheck/Gemfile
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -68,7 +68,7 @@ jobs:
           # - windows-latest <-- failing with fiddle error, temporarily disabled
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -88,7 +88,7 @@ jobs:
           - ubuntu-24.04-s390x
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v4 # v5 fails on these platforms
     - name: Set up Ruby
       run: |
         sudo apt-get update
@@ -112,7 +112,7 @@ jobs:
       PRISM_FFI_BACKEND: "true"
       BUNDLE_GEMFILE: gemfiles/${{ matrix.target.gemfile }}/Gemfile
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -128,7 +128,7 @@ jobs:
         os: [ubuntu-22.04, ubuntu-24.04]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -148,7 +148,7 @@ jobs:
           # - windows-latest <-- failing with fiddle error, temporarily disabled
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -162,7 +162,7 @@ jobs:
   build-minimal:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -178,7 +178,7 @@ jobs:
     env:
       JRUBY_OPTS: "--dev"
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up JRuby
       uses: ruby/setup-ruby@v1
       with:
@@ -190,7 +190,7 @@ jobs:
   lex-ruby:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -202,7 +202,7 @@ jobs:
   lex-discourse:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -214,7 +214,7 @@ jobs:
   lex-top-100:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -234,7 +234,7 @@ jobs:
   memcheck:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install valgrind
       run: |
         sudo apt-get update
@@ -250,7 +250,7 @@ jobs:
   gem-package:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: head
@@ -301,7 +301,7 @@ jobs:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.target.gemfile }}/Gemfile
     runs-on: ${{ matrix.target.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.target.ruby }}
@@ -323,7 +323,7 @@ jobs:
   gcc-analyzer:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -336,7 +336,7 @@ jobs:
   clang-analyzer:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/.github/workflows/rust-bindings.yml b/.github/workflows/rust-bindings.yml
index f2b9d45431..111fd0773e 100644
--- a/.github/workflows/rust-bindings.yml
+++ b/.github/workflows/rust-bindings.yml
@@ -24,7 +24,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -58,7 +58,7 @@ jobs:
       fail-fast: false
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -92,7 +92,7 @@ jobs:
       matrix:
         sanitizer: [address]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with: