diff --git a/gradle.properties b/gradle.properties
index e14eb6c..6e4f05d 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,7 +2,7 @@ kotlin.code.style=official
 kotlin.js.generate.executable.default=false
 
 # versions
-fhirCoreVersion=6.3.3
+fhirCoreVersion=6.3.6
 
 junitVersion=5.7.1
 mockk_version=1.10.2