diff --git a/model.py b/model.py
index 71a7e30..30cd43b 100644
--- a/model.py
+++ b/model.py
@@ -1,7 +1,7 @@
 import os
 
 from keras.models import Sequential, load_model
-from keras.layers import LSTM, Dropout, TimeDistributed, Dense, Activation, Embedding
+from keras.layers import LSTM, Dropout, TimeDistributed, Dense, Activation, Embedding, CuDNNLSTM
 
 MODEL_DIR = './model'
 
@@ -17,7 +17,7 @@ def build_model(batch_size, seq_len, vocab_size):
     model = Sequential()
     model.add(Embedding(vocab_size, 512, batch_input_shape=(batch_size, seq_len)))
     for i in range(3):
-        model.add(LSTM(256, return_sequences=True, stateful=True))
+        model.add(CuDNNLSTM(256, return_sequences=True, stateful=True))
         model.add(Dropout(0.2))
 
     model.add(TimeDistributed(Dense(vocab_size)))