diff --git a/docs/requirements.txt b/docs/requirements.txt
index c2d56bf912aabf7758706a5fcf3366edc28665a6..db6c80998910a4459c40dc14656b65b5f6fe4df0 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -39,7 +39,7 @@ sphinx_rtd_theme
 textgrid
 timer
 ToJyutping
-typeguard
+typeguard==2.13.3
 webrtcvad
 websockets
 yacs~=0.1.8
diff --git a/setup.py b/setup.py
index 6c04ac1e8b9f203878f6615afc5c7ec647ad3d50..578f4986553961d601aeec4b5ea171609c3d1074 100644
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,7 @@ base = [
     "textgrid",
     "timer",
     "ToJyutping",
-    "typeguard",
+    "typeguard==2.13.3",
     "webrtcvad",
     "yacs~=0.1.8",
     "zhon",