diff --git a/.github/workflows/linux_neovim.yml b/.github/workflows/linux_neovim.yml
index ad24533a..3bdc7355 100644
--- a/.github/workflows/linux_neovim.yml
+++ b/.github/workflows/linux_neovim.yml
@@ -41,7 +41,7 @@ jobs:
         run: |
           # https://github.com/Zettlr/Zettlr/issues/3517
           sudo apt-get install libfuse2
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download neovim
         shell: bash
         run: |
@@ -71,7 +71,7 @@ jobs:
         env:
           GO111MODULE: 'on'
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis
diff --git a/.github/workflows/linux_vim.yml b/.github/workflows/linux_vim.yml
index daac3503..ed47d8f2 100644
--- a/.github/workflows/linux_vim.yml
+++ b/.github/workflows/linux_vim.yml
@@ -40,7 +40,7 @@ jobs:
         run: |
           # https://github.com/Zettlr/Zettlr/issues/3517
           sudo apt-get install libfuse2
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download vim
         shell: bash
         run: |
@@ -69,7 +69,7 @@ jobs:
         env:
           GO111MODULE: 'on'
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis
diff --git a/.github/workflows/mac_neovim.yml b/.github/workflows/mac_neovim.yml
index ea71ac19..3c475657 100644
--- a/.github/workflows/mac_neovim.yml
+++ b/.github/workflows/mac_neovim.yml
@@ -36,7 +36,7 @@ jobs:
     runs-on: ${{matrix.os}}
     continue-on-error: ${{matrix.allow_failure}}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download neovim
         shell: bash
         run: curl -L https://github.com/neovim/neovim/releases/download/${{matrix.neovim_version}}/nvim-macos.tar.gz -o ~/nvim.tar.gz
@@ -46,7 +46,7 @@ jobs:
         run: tar xzf ~/nvim.tar.gz -C ~/
         continue-on-error: ${{matrix.allow_failure}}
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis
diff --git a/.github/workflows/mac_vim.yml b/.github/workflows/mac_vim.yml
index 8da3fbc6..b72d74ec 100644
--- a/.github/workflows/mac_vim.yml
+++ b/.github/workflows/mac_vim.yml
@@ -17,12 +17,12 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install MacVim
         shell: bash
         run: brew install macvim
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis
diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 70ac8542..48f5b082 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -13,7 +13,7 @@ jobs:
     name: runner / vint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: vint
         uses: reviewdog/action-vint@v1
         with:
diff --git a/.github/workflows/windows_neovim.yml b/.github/workflows/windows_neovim.yml
index 3ab86744..03f2401b 100644
--- a/.github/workflows/windows_neovim.yml
+++ b/.github/workflows/windows_neovim.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: ${{matrix.os}}
     continue-on-error: ${{matrix.allow_failure}}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download neovim
         shell: PowerShell
         run: Invoke-WebRequest -Uri https://github.com/neovim/neovim/releases/download/${{matrix.neovim_version}}/nvim-${{matrix.neovim_arch}}.zip -OutFile neovim.zip
@@ -70,7 +70,7 @@ jobs:
         env:
           GO111MODULE: 'on'
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis
diff --git a/.github/workflows/windows_vim.yml b/.github/workflows/windows_vim.yml
index 40a28add..ee7d8451 100644
--- a/.github/workflows/windows_vim.yml
+++ b/.github/workflows/windows_vim.yml
@@ -43,7 +43,7 @@ jobs:
             vim_ver_path: vim80
     runs-on: ${{matrix.os}}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download vim
         shell: PowerShell
         run: Invoke-WebRequest -Uri https://github.com/vim/vim-win32-installer/releases/download/v${{matrix.vim_version}}/gvim_${{matrix.vim_version}}_${{matrix.vim_arch}}.zip -OutFile vim.zip
@@ -72,7 +72,7 @@ jobs:
         env:
           GO111MODULE: 'on'
       - name: Download test runner
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: thinca/vim-themis
           path: ./vim-themis