diff --git a/build.gradle b/build.gradle
index 234c8fcc..99e720b7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -164,7 +164,7 @@ dependencies {
     implementation group: 'org.yaml', name: 'snakeyaml', version: '2.5'
     implementation group: 'com.zaxxer', name: 'HikariCP', version: '5.1.0'
     runtimeOnly group: 'org.postgresql', name: 'postgresql', version: '42.7.7'
-    implementation group: 'com.github.hmcts', name: 'auth-checker-lib', version: '2.1.5'
+    implementation group: 'com.github.hmcts', name: 'auth-checker-lib', version: '3.1.1'
     constraints {
         implementation('com.google.guava:guava:33.4.8-jre') {
             because 'previous versions of this transitive dependency have CVEs'