diff --git a/docs/requirements.txt b/docs/requirements.txt
index e4020422..30622230 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -39,7 +39,7 @@ sphinx_rtd_theme
 textgrid
 timer
 ToJyutping==0.2.1
-typeguard
+typeguard==2.13.3
 webrtcvad
 websockets
 yacs~=0.1.8
diff --git a/setup.py b/setup.py
index ffe4d5f3..1545c613 100644
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,7 @@ base = [
     "textgrid",
     "timer",
     "ToJyutping==0.2.1",
-    "typeguard",
+    "typeguard==2.13.3",
     "webrtcvad",
     "yacs~=0.1.8",
     "zhon",