diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8d7a047..960874d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: cache dependencies (Gradle)
         id: cache
@@ -43,7 +43,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: run unit tests
         working-directory: c
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install clojure tools
         uses: DeLaGuardo/setup-clojure@10.0
@@ -76,7 +76,7 @@ jobs:
 #
 #    steps:
 #      - name: get code
-#        uses: actions/checkout@v3
+#        uses: actions/checkout@v4
 #
 #      - name: install NUnit
 #        run: |
@@ -100,7 +100,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: get Go
         uses: actions/setup-go@v3
@@ -119,7 +119,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: cache dependencies (Gradle)
         uses: actions/cache@v3
@@ -147,7 +147,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: cache dependencies (Gradle)
         uses: actions/cache@v3
@@ -174,7 +174,7 @@ jobs:
 #
 #    steps:
 #      - name: get code
-#        uses: actions/checkout@v3
+#        uses: actions/checkout@v4
 #
 #      - name: install
 #        run: npm install
@@ -190,7 +190,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: cache dependencies (Gradle)
         uses: actions/cache@v3
@@ -217,7 +217,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -239,7 +239,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: run unit tests
         working-directory: python
@@ -250,7 +250,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: run unit tests
         working-directory: ruby
@@ -262,7 +262,7 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: cache dependencies (Gradle)
         uses: actions/cache@v3
@@ -291,7 +291,7 @@ jobs:
 #
 #    steps:
 #      - name: get code
-#        uses: actions/checkout@v3
+#        uses: actions/checkout@v4
 #
 #      - name: run unit tests
 #        run: ./test.sh
@@ -302,10 +302,10 @@ jobs:
 
     steps:
       - name: get code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js 18.x
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
           node-version: '18.x'