diff --git a/hapi-fhir-jpaserver-searchparam/src/main/java/ca/uhn/fhir/jpa/searchparam/extractor/SearchParamExtractorR4.java b/hapi-fhir-jpaserver-searchparam/src/main/java/ca/uhn/fhir/jpa/searchparam/extractor/SearchParamExtractorR4.java
index d9937a402ea..bed882359c8 100644
--- a/hapi-fhir-jpaserver-searchparam/src/main/java/ca/uhn/fhir/jpa/searchparam/extractor/SearchParamExtractorR4.java
+++ b/hapi-fhir-jpaserver-searchparam/src/main/java/ca/uhn/fhir/jpa/searchparam/extractor/SearchParamExtractorR4.java
@@ -105,7 +105,7 @@ public class SearchParamExtractorR4 extends BaseSearchParamExtractor implements
 		private final Map<String, Base> myResourceTypeToStub = Collections.synchronizedMap(new HashMap<>());
 
 		@Override
-		public Base resolveConstant(Object appContext, String name, boolean beforeContext) throws PathEngineException {
+		public List<Base> resolveConstant(Object appContext, String name, boolean beforeContext) throws PathEngineException {
 			return null;
 		}
 
diff --git a/pom.xml b/pom.xml
index 2f283a9be09..e71cd11e1e3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -767,7 +767,7 @@
 
     <properties>
 
-        <fhir_core_version>5.6.55-SNAPSHOT</fhir_core_version>
+        <fhir_core_version>5.6.55</fhir_core_version>
         <ucum_version>1.0.3</ucum_version>
 
         <surefire_jvm_args>-Dfile.encoding=UTF-8 -Xmx2048m</surefire_jvm_args>