diff --git a/backend/build.gradle b/backend/build.gradle
index da93e911ee..17dde07d13 100644
--- a/backend/build.gradle
+++ b/backend/build.gradle
@@ -66,7 +66,7 @@ dependencies {
     implementation 'org.postgresql:postgresql'
 
     // data validation
-    implementation 'com.googlecode.libphonenumber:libphonenumber:8.13.19'
+    implementation 'com.googlecode.libphonenumber:libphonenumber:8.13.28'
     implementation 'com.smartystreets.api:smartystreets-java-sdk:3.14.1'
 
     // UI layer dependencies
diff --git a/backend/gradle.lockfile b/backend/gradle.lockfile
index 411cc89318..a30f96bfac 100644
--- a/backend/gradle.lockfile
+++ b/backend/gradle.lockfile
@@ -37,7 +37,7 @@ com.google.guava:failureaccess:1.0.1=compileClasspath,runtimeClasspath
 com.google.guava:guava-parent:32.1.1-jre=compileClasspath,runtimeClasspath
 com.google.guava:guava:32.1.1-jre=compileClasspath,runtimeClasspath
 com.google.j2objc:j2objc-annotations:2.8=compileClasspath
-com.googlecode.libphonenumber:libphonenumber:8.13.19=compileClasspath,runtimeClasspath
+com.googlecode.libphonenumber:libphonenumber:8.13.28=compileClasspath,runtimeClasspath
 com.graphql-java:graphql-java-extended-scalars:20.0=compileClasspath,runtimeClasspath
 com.graphql-java:graphql-java-extended-validation:20.0=compileClasspath,runtimeClasspath
 com.graphql-java:graphql-java:20.2=compileClasspath,runtimeClasspath