diff --git a/gradle.properties b/gradle.properties
index 9035f974..f4e5bb13 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-relVersion=1.4.1
+relVersion=1.5.0
 docsVersion=1.2.0
 builtBy=Norman Walsh
 
@@ -9,7 +9,7 @@ saxonGroup=net.sf.saxon
 saxonName=Saxon-HE
 saxonVersion=10.8
 
-xmlresolverVersion=4.2.0
+xmlresolverVersion=4.5.2
 
 docsBaseURI=https://ndw.github.io/xmlcalabash1-docs/download/