diff --git a/ui/build/path.go b/ui/build/path.go
index 29128d8..51ebff1 100644
--- a/ui/build/path.go
+++ b/ui/build/path.go
@@ -180,7 +180,7 @@
 			// Compute the error message along with the process tree, including
 			// parents, for this log line.
 			procPrints := []string{
-				"See https://android.googlesource.com/platform/build/+/master/Changes.md#PATH_Tools for more information.",
+				"See https://android.googlesource.com/platform/build/+/main/Changes.md#PATH_Tools for more information.",
 			}
 			if len(log.Parents) > 0 {
 				procPrints = append(procPrints, "Process tree:")
diff --git a/ui/status/ninja_frontend/README b/ui/status/ninja_frontend/README
index 8c4b451..767bbf1 100644
--- a/ui/status/ninja_frontend/README
+++ b/ui/status/ninja_frontend/README
@@ -1,3 +1,3 @@
-This comes from https://android.googlesource.com/platform/external/ninja/+/master/src/frontend.proto
+This comes from https://android.googlesource.com/platform/external/ninja/+/main/src/frontend.proto
 
 The only difference is the specification of a go_package. To regenerate frontend.pb.go, run regen.sh.