diff --git a/build.gradle b/build.gradle
index 6d9a7b81b..fff63fa5a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -128,6 +128,7 @@ allprojects {
 		junitVersion = '5.6.2'
 		commonsIoVersion = '2.6'
 		bouncyCastleVersion = '1.68'
+		guavaVersion = '30.1-jre'
 
 		if (project.hasProperty("useSonatype")) {
 			useSonatype = project.getProperty("useSonatype").toBoolean()
diff --git a/smack-core/build.gradle b/smack-core/build.gradle
index b0cd79641..e8a75a8a5 100644
--- a/smack-core/build.gradle
+++ b/smack-core/build.gradle
@@ -33,7 +33,7 @@ dependencies {
 	testFixturesApi "org.assertj:assertj-core:3.11.1"
 	testFixturesApi "org.xmlunit:xmlunit-assertj:$xmlUnitVersion"
 	testFixturesApi 'org.hamcrest:hamcrest-library:2.2'
-	testFixturesApi 'com.google.guava:guava:28.2-jre'
+	testFixturesApi "com.google.guava:guava:${guavaVersion}"
 }
 
 class CreateFileTask extends DefaultTask {
diff --git a/smack-integration-test/build.gradle b/smack-integration-test/build.gradle
index c3e6602d4..d92efbbae 100644
--- a/smack-integration-test/build.gradle
+++ b/smack-integration-test/build.gradle
@@ -9,7 +9,8 @@ applicationDefaultJvmArgs = ["-enableassertions"]
 dependencies {
 	api project(':smack-java8-full')
 	api project(':smack-resolver-dnsjava')
-	compile 'org.reflections:reflections:0.9.11'
+	implementation "com.google.guava:guava:${guavaVersion}"
+	compile 'org.reflections:reflections:0.9.12'
 	compile 'eu.geekplace.javapinning:java-pinning-java7:1.1.0-alpha1'
 	compile group: 'commons-io', name: 'commons-io', version: "$commonsIoVersion"
 	api "org.junit.jupiter:junit-jupiter-api:$junitVersion"