diff --git a/Package.swift b/Package.swift
index 235acef7228..64f822fd380 100644
--- a/Package.swift
+++ b/Package.swift
@@ -929,7 +929,7 @@ func swiftSyntaxDependencies(_ names: [String]) -> [Target.Dependency] {
 // this right now.
 
 /// When not using local dependencies, the branch to use for llbuild and TSC repositories.
-let relatedDependenciesBranch = "main"
+let relatedDependenciesBranch = "release/6.1"
 
 if ProcessInfo.processInfo.environment["SWIFTPM_LLBUILD_FWK"] == nil {
     if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {