diff --git a/TTS/utils/audio/numpy_transforms.py b/TTS/utils/audio/numpy_transforms.py
index 2aa6cce6..ae44472f 100644
--- a/TTS/utils/audio/numpy_transforms.py
+++ b/TTS/utils/audio/numpy_transforms.py
@@ -219,7 +219,7 @@ def istft(
 
 def griffin_lim(*, spec: np.ndarray = None, num_iter=60, **kwargs) -> np.ndarray:
     angles = np.exp(2j * np.pi * np.random.rand(*spec.shape))
-    S_complex = np.abs(spec).astype(np.complex)
+    S_complex = np.abs(spec).astype(complex)
     y = istft(y=S_complex * angles, **kwargs)
     if not np.isfinite(y).all():
         print(" [!] Waveform is not finite everywhere. Skipping the GL.")
diff --git a/requirements.ja.txt b/requirements.ja.txt
index 69061d6b..d6a04ca4 100644
--- a/requirements.ja.txt
+++ b/requirements.ja.txt
@@ -1,3 +1,4 @@
+# These cause some compatibility issues on some systems and are not strictly necessary
 # japanese g2p deps
 mecab-python3==1.0.6
 unidic-lite==1.0.8