diff --git a/DEPS b/DEPS
index e814982a7fd..c350c3d4c56 100644
--- a/DEPS
+++ b/DEPS
@@ -88,7 +88,7 @@ vars = {
   "download_fuchsia_deps": False,
 
   # Ninja, runs the build based on files generated by GN.
-  "ninja_tag": "version:2@1.11.1.chromium.7",
+  "ninja_tag": "version:3@1.13.1.chromium.4",
 
   # Scripts that make 'git cl format' work.
   "clang_format_scripts_rev": "bb994c6f067340c1135eb43eed84f4b33cfa7397",
diff --git a/tools/list_dart_files_as_depfile.py b/tools/list_dart_files_as_depfile.py
index 84eddeec8c6..9c58d7aed2d 100644
--- a/tools/list_dart_files_as_depfile.py
+++ b/tools/list_dart_files_as_depfile.py
@@ -48,9 +48,8 @@ def main(argv):
                     '.dart') and not filename.endswith('_test.dart'):
                 fullname = os.path.join(directory, root, filename)
                 fullname = fullname.replace(os.sep, '/')
-                out.write(" \"")
-                out.write(fullname)
-                out.write("\"")
+                out.write(" ")
+                out.write(fullname.replace(" ", r"\ "))
 
     out.write("\n")
     out.close()