diff --git a/cloud-annotations/src/test/java/org/incendo/cloud/annotations/AnnotationParserTest.java b/cloud-annotations/src/test/java/org/incendo/cloud/annotations/AnnotationParserTest.java
index f324de446..7fe5f48bb 100644
--- a/cloud-annotations/src/test/java/org/incendo/cloud/annotations/AnnotationParserTest.java
+++ b/cloud-annotations/src/test/java/org/incendo/cloud/annotations/AnnotationParserTest.java
@@ -261,6 +261,7 @@ public void testInjectedParameters(
         System.out.printf("Injected value: %s\n", injectableValue.toString());
     }
 
+    @SuppressWarnings({"ClassInitializationDeadlock", "EffectivelyPrivate"})
     @Command("class")
     private static class ClassCommandMethod {
 
@@ -278,6 +279,7 @@ public void annotatedMethod() {
     }
 
 
+    @SuppressWarnings({"ClassInitializationDeadlock", "EffectivelyPrivate"})
     @Bad1
     @CommandDescription("Hello World!")
     private static class AnnotatedClass {
@@ -348,6 +350,7 @@ public String toString() {
     }
 
 
+    @SuppressWarnings("EffectivelyPrivate")
     private static final class AliasedCommands {
 
         private static final String COMMAND_ALIASES = "acommand|analias|anotheralias";
diff --git a/cloud-annotations/src/test/java/org/incendo/cloud/annotations/issue/Issue450.java b/cloud-annotations/src/test/java/org/incendo/cloud/annotations/issue/Issue450.java
index b9fa17848..070509ddb 100644
--- a/cloud-annotations/src/test/java/org/incendo/cloud/annotations/issue/Issue450.java
+++ b/cloud-annotations/src/test/java/org/incendo/cloud/annotations/issue/Issue450.java
@@ -64,6 +64,7 @@ void testPrefixedAlias() {
         ).join();
     }
 
+    @SuppressWarnings({"ClassInitializationDeadlock", "EffectivelyPrivate"})
     private static class TestCommandClass {
 
         @Command("/command|/cmd")
diff --git a/cloud-core/src/main/java/org/incendo/cloud/description/Description.java b/cloud-core/src/main/java/org/incendo/cloud/description/Description.java
index 83e700021..ab1e4dfc2 100644
--- a/cloud-core/src/main/java/org/incendo/cloud/description/Description.java
+++ b/cloud-core/src/main/java/org/incendo/cloud/description/Description.java
@@ -39,6 +39,7 @@
 @API(status = API.Status.STABLE)
 public interface Description {
 
+    @SuppressWarnings("ClassInitializationDeadlock")
     Description EMPTY = DescriptionImpl.of("");
 
     /**
diff --git a/cloud-core/src/test/java/org/incendo/cloud/CommandTest.java b/cloud-core/src/test/java/org/incendo/cloud/CommandTest.java
index b50589914..773a3c58b 100644
--- a/cloud-core/src/test/java/org/incendo/cloud/CommandTest.java
+++ b/cloud-core/src/test/java/org/incendo/cloud/CommandTest.java
@@ -32,7 +32,7 @@
 
 class CommandTest {
 
-    @Test()
+    @Test
     void noArguments() {
         assertThat(
                 Command
diff --git a/cloud-core/src/test/java/org/incendo/cloud/ParameterInjectorRegistryTest.java b/cloud-core/src/test/java/org/incendo/cloud/ParameterInjectorRegistryTest.java
index 6dc7edb8a..302aa0813 100644
--- a/cloud-core/src/test/java/org/incendo/cloud/ParameterInjectorRegistryTest.java
+++ b/cloud-core/src/test/java/org/incendo/cloud/ParameterInjectorRegistryTest.java
@@ -125,7 +125,7 @@ void testNonExistentInjection() {
         assertThat(result).isEmpty();
     }
 
-    @SuppressWarnings("unused")
+    @SuppressWarnings({"unused", "UnnecessaryQualifier"})
     private static void testAnnotatedMethod(@TestAnnotation final Integer ignored) {}
 
 
diff --git a/cloud-core/src/test/java/org/incendo/cloud/util/TestUtils.java b/cloud-core/src/test/java/org/incendo/cloud/util/TestUtils.java
index 8a56c2942..980c25193 100644
--- a/cloud-core/src/test/java/org/incendo/cloud/util/TestUtils.java
+++ b/cloud-core/src/test/java/org/incendo/cloud/util/TestUtils.java
@@ -48,6 +48,7 @@ public final class TestUtils {
     private TestUtils() {
     }
 
+    @SuppressWarnings({"ClassInitializationDeadlock", "EffectivelyPrivate"})
     private abstract static class TestCommandSenderCommandManager extends CommandManager<TestCommandSender> {
 
         @SuppressWarnings("unused") // mocked via mockito
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 8a0fab74a..8ce6b138f 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -8,7 +8,7 @@ cloud-buildLogic-rootProject-spotless = { id = "org.incendo.cloud-build-logic.sp
 checkstyle = "10.12.5"
 stylecheck = "0.2.1"
 checkerQual = "3.47.0"
-errorprone = "2.27.1"
+errorprone = "2.42.0"
 geantyref = "1.3.16"
 jmh = "1.37"
 apiguardian = "1.1.2"