diff --git a/pom.xml b/pom.xml
index 1474f77..4c5afcd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <fhir.version>7.6.1</fhir.version>
+        <fhir.version>8.6.5</fhir.version>
         <log4j.version>2.25.3</log4j.version>
         <fasterxml.version>2.19.2</fasterxml.version>
         <sonar.organization>nhsdigital</sonar.organization>