diff --git a/build.gradle b/build.gradle
index d6df0daff8e..0026ef99893 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,11 +1,10 @@
 import com.github.jk1.license.filter.LicenseBundleNormalizer
+import groovy.json.JsonSlurper
 import tech.pegasys.internal.license.reporter.GroupedLicenseHtmlRenderer
 import tech.pegasys.teku.depcheck.DepCheckPlugin
 
 import java.text.SimpleDateFormat
 
-import groovy.json.JsonSlurper
-
 import static tech.pegasys.teku.repackage.Repackage.repackage
 
 buildscript {
@@ -325,7 +324,7 @@ allprojects {
 }
 
 def nightly = System.getenv("NIGHTLY") != null
-def refTestVersion = nightly ? "nightly" : "v1.5.0-alpha.8"
+def refTestVersion = nightly ? "nightly" : "v1.5.0-alpha.9"
 def blsRefTestVersion = 'v0.1.2'
 def slashingProtectionInterchangeRefTestVersion = 'v5.3.0'
 def refTestBaseUrl = 'https://github.com/ethereum/consensus-spec-tests/releases/download'