diff --git a/build.gradle b/build.gradle
index 2d6696f..1845497 100644
--- a/build.gradle
+++ b/build.gradle
@@ -212,7 +212,7 @@ dependencies {
 	implementation 'org.eclipse.jetty.aggregate:jetty-all:7.0.0.v20091005'
 
 	testImplementation 'junit:junit:4.12'
-	testImplementation 'org.mockito:mockito-core:3.0.0'
+	testImplementation 'org.mockito:mockito-core:5.21.0'
 	testImplementation 'org.apache.commons:commons-lang3:3.5'
 	testImplementation('com.github.kbase:java_test_utilities:0.1.0') {
 		exclude group: 'com.fasterxml.jackson.core'  // upgrading breaks stuff