diff --git a/build.gradle b/build.gradle
index 859112f..725fe0b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -50,7 +50,7 @@ dependencies {
     testImplementation "org.hamcrest:hamcrest-all:1.3"
     testImplementation "junit:junit:4.12"
     testImplementation "com.launchdarkly:launchdarkly-java-server-sdk:${versions.sdk}:test" // our unit tests use helper classes from the SDK
-    testImplementation "com.google.guava:guava:28.2-jre" // required by SDK tests, not used in this library itself
+    testImplementation "com.google.guava:guava:33.6.0-jre" // required by SDK tests, not used in this library itself
     testImplementation "com.google.code.gson:gson:2.7" // same as above
 }