diff --git a/gradle/upstream-repositories.gradle b/gradle/upstream-repositories.gradle
index c95b1590cf..fbd028c565 100644
--- a/gradle/upstream-repositories.gradle
+++ b/gradle/upstream-repositories.gradle
@@ -27,6 +27,7 @@ repositories {
   mavenCentral()
   if (findProperty('useJenkinsSnapshots') == 'true') {
     maven { url "$JENKINS_URL/job/lsp4j/$MVN_REPOPATH" }
+    maven { url "https://repo.eclipse.org/content/repositories" }
     maven { url jenkinsPipelineRepo('xtext-lib','autodetect') }
   } else {
     mavenLocal()