diff --git a/.github/workflows/bibcop.yml b/.github/workflows/bibcop.yml
index f1f3eefb..ef84f564 100644
--- a/.github/workflows/bibcop.yml
+++ b/.github/workflows/bibcop.yml
@@ -28,5 +28,5 @@ jobs:
   bibcop:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - uses: yegor256/bibcop-action@master
diff --git a/.github/workflows/hadolint.yml b/.github/workflows/hadolint.yml
index efbd6900..fd84b0a6 100644
--- a/.github/workflows/hadolint.yml
+++ b/.github/workflows/hadolint.yml
@@ -28,5 +28,5 @@ jobs:
   hadolint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - uses: hadolint/hadolint-action@v3.1.0
diff --git a/.github/workflows/make.yml b/.github/workflows/make.yml
index 194b5071..c932e680 100644
--- a/.github/workflows/make.yml
+++ b/.github/workflows/make.yml
@@ -36,6 +36,6 @@ jobs:
     runs-on: ubuntu-22.04
     container: yegor256/cam:0.9.2
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - run: make install
       - run: make env lint test
diff --git a/.github/workflows/markdown-lint.yml b/.github/workflows/markdown-lint.yml
index aa0a30c2..a158c77c 100644
--- a/.github/workflows/markdown-lint.yml
+++ b/.github/workflows/markdown-lint.yml
@@ -36,5 +36,5 @@ jobs:
   markdown-lint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@8459bc0c7e3759cdf591f513d9f141a95fef0a8f
+      - uses: actions/checkout@v4
       - uses: articulate/actions-markdownlint@v1
diff --git a/.github/workflows/up.yml b/.github/workflows/up.yml
index d7666162..472f08d1 100644
--- a/.github/workflows/up.yml
+++ b/.github/workflows/up.yml
@@ -34,7 +34,7 @@ jobs:
   up:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - run: |-
           git fetch --tags --force && \
           latest=$(git tag --sort=creatordate | tail -1) && \