diff --git a/build.gradle b/build.gradle
index e307171..ce1c48c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -359,7 +359,7 @@ dependencies {
 	// needed for syslog4j. Used in java test modules and JsonServerServlet subclasses in tests
 	// but not in SDK code proper.
 	testImplementation('net.java.dev.jna:jna:3.4.0')
-	testImplementation("nl.jqno.equalsverifier:equalsverifier:4.0.7")
+	testImplementation("nl.jqno.equalsverifier:equalsverifier:4.1.1")
 	// this is OOOOOOLD. But that probably means updating java_common
 	testImplementation('org.eclipse.jetty.aggregate:jetty-all:7.0.0.v20091005')
 	testImplementation('org.hamcrest:hamcrest:3.0')