diff --git a/build.gradle b/build.gradle
index 07edd9a..7b6e0af 100644
--- a/build.gradle
+++ b/build.gradle
@@ -35,7 +35,7 @@ subprojects {
     version = rootProject.version
 
     dependencies {
-        implementation group: "com.google.guava", name: "guava", version: "20.0"
+        implementation group: "com.google.guava", name: "guava", version: "23.0"
 
         compileOnly group: "org.projectlombok", name: "lombok", version: "1.18.20"
         annotationProcessor group: "org.projectlombok", name: "lombok", version: "1.18.20"
diff --git a/scim2-sdk-common/build.gradle b/scim2-sdk-common/build.gradle
index 2b867e4..80bcb13 100644
--- a/scim2-sdk-common/build.gradle
+++ b/scim2-sdk-common/build.gradle
@@ -7,6 +7,6 @@ dependencies {
     implementation group: "com.fasterxml.jackson.core", name: "jackson-core", version: "2.7.4"
     implementation group: "com.fasterxml.jackson.core", name: "jackson-annotations", version: "2.7.4"
     implementation group: "com.fasterxml.jackson.core", name: "jackson-databind", version: "2.7.9.5"
-    implementation group: "com.google.guava", name: "guava", version: "20.0"
+    implementation group: "com.google.guava", name: "guava", version: "23.0"
     testImplementation group: "org.testng", name: "testng", version: "6.4"
 }
\ No newline at end of file