diff --git a/Realtime_Voice_Changer_on_Colab.ipynb b/Realtime_Voice_Changer_on_Colab.ipynb
index d998459c..66da42e2 100644
--- a/Realtime_Voice_Changer_on_Colab.ipynb
+++ b/Realtime_Voice_Changer_on_Colab.ipynb
@@ -91,6 +91,7 @@
         "print(\"\\033[92mSuccessfully cloned the repository\")\n",
         "\n",
         "!apt-get install libportaudio2 &> /dev/null\n",
+	"!pip install pyworld"
         "!pip install onnxruntime-gpu uvicorn faiss-gpu fairseq jedi google-colab moviepy decorator==4.4.2 sounddevice numpy==1.23.5 pyngrok --quiet\n",
         "!pip install -r requirements.txt --no-build-isolation --quiet\n",
         "# Maybe install Tensor packages?\n",