diff --git a/build.gradle b/build.gradle
index 5389f617..4d4d5f0c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -58,7 +58,7 @@ dependencies {
     testImplementation "com.squareup.okhttp3:mockwebserver:4.8.0"
     testImplementation 'io.projectreactor:reactor-test'
     testImplementation 'org.jeasy:easy-random-core:4.2.0'
-    implementation 'ca.uhn.hapi.fhir:hapi-fhir-base:4.2.0'
+    implementation 'ca.uhn.hapi.fhir:hapi-fhir-base:5.4.1'
     implementation 'ca.uhn.hapi.fhir:hapi-fhir-structures-r4:4.2.0'
     implementation 'org.apache.httpcomponents:httpclient:4.5.12'
     implementation 'com.nimbusds:nimbus-jose-jwt:8.19'