diff --git a/packages/google-cloud-texttospeech/synth.metadata b/packages/google-cloud-texttospeech/synth.metadata
index 1a2f045d279..7ff9a704b2c 100644
--- a/packages/google-cloud-texttospeech/synth.metadata
+++ b/packages/google-cloud-texttospeech/synth.metadata
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5936421202fb53ed4641bcb824017dd393a3dbcc"
+        "sha": "94421c47802f56a44c320257b2b4c190dc7d6b68"
       }
     }
   ],