diff --git a/utils/update_build_version.py b/utils/update_build_version.py
--- a/utils/update_build_version.py
+++ b/utils/update_build_version.py
@@ -128,18 +128,18 @@
 
 
 def main():
-    if len(sys.argv) != 5:
+    if len(sys.argv) < 5:
         print(('usage: {} <shaderc-dir> <spirv-tools-dir> <glslang-dir> <output-file>'.format(
             sys.argv[0])))
         sys.exit(1)
 
-    projects = ['shaderc', 'spirv-tools', 'glslang']
+    projects = ['shaderc']
     new_content = ''.join([
         '"{}\\n"\n'.format(get_version_string(p, d))
         for (p, d) in zip(projects, sys.argv[1:])
     ])
 
-    output_file = sys.argv[4]
+    output_file = sys.argv[-1]
     mkdir_p(os.path.dirname(output_file))
 
     if os.path.isfile(output_file):