diff --git a/build.gradle b/build.gradle
index 2d0797b7..e2084186 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ buildscript {
     mavenCentral()
   }
   dependencies {
-    def haleVersion = '6.3.3'
+    def haleVersion = '6.4.0'
     // for Config class
     classpath "eu.esdihumboldt.hale:eu.esdihumboldt.util.config:$haleVersion"
     // for XMLSchemaUpdater (depends on https://github.com/halestudio/hale/pull/731)