diff --git a/requirements.bazel.txt b/requirements.bazel.txt
index e2618c950f3..4d52beb9e11 100644
--- a/requirements.bazel.txt
+++ b/requirements.bazel.txt
@@ -1,6 +1,6 @@
 # GRPC Python setup requirements
 coverage>=4.0
-cython>=0.28.3
+cython>=0.29.8
 enum34>=1.0.4
 protobuf>=3.5.0.post1
 six>=1.10
diff --git a/requirements.txt b/requirements.txt
index f583fc94eb4..27dd7d9f63b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # GRPC Python setup requirements
 coverage>=4.0
-cython>=0.28.3
+cython>=0.29.8
 enum34>=1.0.4
 protobuf>=3.5.0.post1
 six>=1.10