diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 659effc..55191da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -76,7 +76,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/main/scala/sbtghactions/WorkflowStep.scala b/src/main/scala/sbtghactions/WorkflowStep.scala
index aa792b5..b85baf2 100644
--- a/src/main/scala/sbtghactions/WorkflowStep.scala
+++ b/src/main/scala/sbtghactions/WorkflowStep.scala
@@ -33,11 +33,11 @@ object WorkflowStep {
   val DefaultSbtStepPreamble: List[String] = List(s"++ $${{ matrix.scala }}")
 
   val CheckoutFull: WorkflowStep = Use(
-    UseRef.Public("actions", "checkout", "v3"),
+    UseRef.Public("actions", "checkout", "v4"),
     name = Some("Checkout current branch (full)"),
     params = Map("fetch-depth" -> "0"))
 
-  val Checkout: WorkflowStep = Use(UseRef.Public("actions", "checkout", "v3"), name = Some("Checkout current branch (fast)"))
+  val Checkout: WorkflowStep = Use(UseRef.Public("actions", "checkout", "v4"), name = Some("Checkout current branch (fast)"))
 
   def SetupJava(versions: List[JavaSpec]): List[WorkflowStep] =
     versions map {
diff --git a/src/sbt-test/sbtghactions/check-and-regenerate/expected-ci.yml b/src/sbt-test/sbtghactions/check-and-regenerate/expected-ci.yml
index 5312e4f..be4d31f 100644
--- a/src/sbt-test/sbtghactions/check-and-regenerate/expected-ci.yml
+++ b/src/sbt-test/sbtghactions/check-and-regenerate/expected-ci.yml
@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -90,7 +90,7 @@ jobs:
 
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/sbt-test/sbtghactions/no-clean/.github/workflows/ci.yml b/src/sbt-test/sbtghactions/no-clean/.github/workflows/ci.yml
index 2948d0d..aacb740 100644
--- a/src/sbt-test/sbtghactions/no-clean/.github/workflows/ci.yml
+++ b/src/sbt-test/sbtghactions/no-clean/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -66,7 +66,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/sbt-test/sbtghactions/non-existent-target/.github/workflows/ci.yml b/src/sbt-test/sbtghactions/non-existent-target/.github/workflows/ci.yml
index da0d647..9fa73b9 100644
--- a/src/sbt-test/sbtghactions/non-existent-target/.github/workflows/ci.yml
+++ b/src/sbt-test/sbtghactions/non-existent-target/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -65,7 +65,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/sbt-test/sbtghactions/sbt-native-thin-client/.github/workflows/ci.yml b/src/sbt-test/sbtghactions/sbt-native-thin-client/.github/workflows/ci.yml
index 0eb9c92..f8aca7f 100644
--- a/src/sbt-test/sbtghactions/sbt-native-thin-client/.github/workflows/ci.yml
+++ b/src/sbt-test/sbtghactions/sbt-native-thin-client/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -82,7 +82,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/sbt-test/sbtghactions/suppressed-scala-version/expected-ci.yml b/src/sbt-test/sbtghactions/suppressed-scala-version/expected-ci.yml
index 6c74b9c..60dddc3 100644
--- a/src/sbt-test/sbtghactions/suppressed-scala-version/expected-ci.yml
+++ b/src/sbt-test/sbtghactions/suppressed-scala-version/expected-ci.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -67,7 +67,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/src/test/scala/sbtghactions/GenerativePluginSpec.scala b/src/test/scala/sbtghactions/GenerativePluginSpec.scala
index ad96621..61687d5 100644
--- a/src/test/scala/sbtghactions/GenerativePluginSpec.scala
+++ b/src/test/scala/sbtghactions/GenerativePluginSpec.scala
@@ -516,7 +516,7 @@ class GenerativePluginSpec extends Specification {
     - run: echo hello
 
     - name: Checkout current branch (fast)
-      uses: actions/checkout@v3"""
+      uses: actions/checkout@v4"""
     }
 
     "compile a job with one step and three oses" in {
@@ -737,7 +737,7 @@ class GenerativePluginSpec extends Specification {
     - run: echo $${{ matrix.test }}
 
     - name: Checkout current branch (fast)
-      uses: actions/checkout@v3"""
+      uses: actions/checkout@v4"""
     }
 
     "compile a job with extra runs-on labels" in {
@@ -960,7 +960,7 @@ class GenerativePluginSpec extends Specification {
     - run: echo hello
 
     - name: Checkout current branch (fast)
-      uses: actions/checkout@v3"""
+      uses: actions/checkout@v4"""
     }
   }