diff --git a/.github/workflows/build-jdk11.yaml b/.github/workflows/build-jdk11.yaml
index 9eccae55a5..3de9e6e885 100644
--- a/.github/workflows/build-jdk11.yaml
+++ b/.github/workflows/build-jdk11.yaml
@@ -14,11 +14,11 @@ jobs:
       # the code is compiled using JDK 17, while the tests are executed
       # using JDK 11.
       - name: Check out code
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4.1.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           persist-credentials: false
       - name: Set up JDK
-        uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
+        uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93 # v4.0.0
         with:
           java-version: |
             11.0.20
diff --git a/documentation-support/src/main/java/tech/picnic/errorprone/documentation/BugPatternTestExtractor.java b/documentation-support/src/main/java/tech/picnic/errorprone/documentation/BugPatternTestExtractor.java
index cf7f7a0b0e..e694c4943f 100644
--- a/documentation-support/src/main/java/tech/picnic/errorprone/documentation/BugPatternTestExtractor.java
+++ b/documentation-support/src/main/java/tech/picnic/errorprone/documentation/BugPatternTestExtractor.java
@@ -125,8 +125,8 @@ private static Optional<String> getClassUnderTest(
       }
 
       ExpressionTree receiver = ASTHelpers.getReceiver(tree);
-      return receiver instanceof MethodInvocationTree
-          ? getClassUnderTest((MethodInvocationTree) receiver, state)
+      return receiver instanceof MethodInvocationTree methodInvocation
+          ? getClassUnderTest(methodInvocation, state)
           : Optional.empty();
     }
 
@@ -144,8 +144,8 @@ private static void extractIdentificationTestCases(
       }
 
       ExpressionTree receiver = ASTHelpers.getReceiver(tree);
-      if (receiver instanceof MethodInvocationTree) {
-        extractIdentificationTestCases((MethodInvocationTree) receiver, sink, state);
+      if (receiver instanceof MethodInvocationTree methodInvocation) {
+        extractIdentificationTestCases(methodInvocation, sink, state);
       }
     }
 
@@ -174,8 +174,8 @@ private static void extractReplacementTestCases(
       }
 
       ExpressionTree receiver = ASTHelpers.getReceiver(tree);
-      if (receiver instanceof MethodInvocationTree) {
-        extractReplacementTestCases((MethodInvocationTree) receiver, sink, state);
+      if (receiver instanceof MethodInvocationTree methodInvocation) {
+        extractReplacementTestCases(methodInvocation, sink, state);
       }
     }
 
diff --git a/documentation-support/src/test/java/tech/picnic/errorprone/documentation/DocumentationGeneratorTaskListenerTest.java b/documentation-support/src/test/java/tech/picnic/errorprone/documentation/DocumentationGeneratorTaskListenerTest.java
index 2394b15a14..0b300dc23b 100644
--- a/documentation-support/src/test/java/tech/picnic/errorprone/documentation/DocumentationGeneratorTaskListenerTest.java
+++ b/documentation-support/src/test/java/tech/picnic/errorprone/documentation/DocumentationGeneratorTaskListenerTest.java
@@ -125,8 +125,8 @@ public Optional<ExtractionParameters> tryExtract(ClassTree tree, VisitorState st
     }
 
     private static String describeTree(Tree tree) {
-      return (tree instanceof ClassTree)
-          ? String.join(": ", String.valueOf(tree.getKind()), ((ClassTree) tree).getSimpleName())
+      return (tree instanceof ClassTree clazz)
+          ? String.join(": ", String.valueOf(tree.getKind()), clazz.getSimpleName())
           : tree.getKind().toString();
     }
   }
diff --git a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/NonStaticImport.java b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/NonStaticImport.java
index f913b93e09..a4a6c07260 100644
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/NonStaticImport.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/NonStaticImport.java
@@ -159,10 +159,9 @@ private static ImmutableTable<String, String, UndesiredStaticImport> getUndesire
         ImmutableTable.builder();
     for (ImportTree importTree : tree.getImports()) {
       Tree qualifiedIdentifier = importTree.getQualifiedIdentifier();
-      if (importTree.isStatic() && qualifiedIdentifier instanceof MemberSelectTree) {
-        MemberSelectTree memberSelectTree = (MemberSelectTree) qualifiedIdentifier;
-        String type = SourceCode.treeToString(memberSelectTree.getExpression(), state);
-        String member = memberSelectTree.getIdentifier().toString();
+      if (importTree.isStatic() && qualifiedIdentifier instanceof MemberSelectTree memberSelect) {
+        String type = SourceCode.treeToString(memberSelect.getExpression(), state);
+        String member = memberSelect.getIdentifier().toString();
         if (shouldNotBeStaticallyImported(type, member)) {
           imports.put(
               type,