diff --git a/build.gradle b/build.gradle
index acd10c3387f411b00c3922693c1849f8c8ef0ff1..d1b8a320689a817bf18bb535ab8f1b27029eeb9d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -87,8 +87,8 @@ apply from: "${projectDir}/gradle/spotbugs.gradle"
 apply from: "${projectDir}/gradle/spotless.gradle"
 
 dependencies {
-  api "com.google.guava:guava:28.2-jre"
-  api "com.google.code.gson:gson:2.8.6"
+  api "com.google.guava:guava:${guavaVersion}"
+  api "com.google.code.gson:gson:${gsonVersion}"
   testImplementation "org.junit.jupiter:junit-jupiter:${junitVersion}"
 }
 
diff --git a/gradle.properties b/gradle.properties
index f4f699cf58ed6edfd3c9bab2fafcecaca4671c6a..794e21ef535ce4b104c51fc0184d4146bbd0c99e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 junitVersion = 5.8.2
 githooksVersion = 1.2.0
 gsonVersion  = 2.8.9
-guavaVersion = 31.0.1-jre
+guavaVersion = 30.1.1-jre
 nodeVersion = 3.1.1
 spotbugsVersion = 4.7.0
 spotlessVersion = 6.0.4