diff --git a/python/pyproject.toml b/python/pyproject.toml
index d210afee9..fb3a1e119 100755
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -69,7 +69,7 @@ dependencies = [
   "tqdm",
   "transformers==4.57.1",
   "uvicorn",
-  "uvloop",
+  "uvloop==0.21.0",
   "xgrammar==0.1.25",
   "grpcio==1.75.1", # keep it align with compile_proto.py
   "grpcio-tools==1.75.1", # keep it align with compile_proto.py
diff --git a/python/pyproject_cpu.toml b/python/pyproject_cpu.toml
index 786267175..69f9622b5 100644
--- a/python/pyproject_cpu.toml
+++ b/python/pyproject_cpu.toml
@@ -61,7 +61,7 @@ dependencies = [
   "tqdm",
   "transformers==4.57.1",
   "uvicorn",
-  "uvloop",
+  "uvloop==0.21.0",
   "xgrammar==0.1.25",
   "grpcio==1.75.1", # keep it align with compile_proto.py
   "grpcio-tools==1.75.1", # keep it align with compile_proto.py
diff --git a/python/pyproject_other.toml b/python/pyproject_other.toml
index 290c46768..b6026c19d 100755
--- a/python/pyproject_other.toml
+++ b/python/pyproject_other.toml
@@ -60,7 +60,7 @@ runtime_common = [
   "tqdm",
   "transformers==4.57.1",
   "uvicorn",
-  "uvloop",
+  "uvloop==0.21.0",
   "xgrammar==0.1.25",
   "grpcio==1.75.1", # keep it align with compile_proto.py
   "grpcio-tools==1.75.1", # keep it align with compile_proto.py
diff --git a/python/pyproject_xpu.toml b/python/pyproject_xpu.toml
index 2922e4779..429a6a145 100644
--- a/python/pyproject_xpu.toml
+++ b/python/pyproject_xpu.toml
@@ -63,7 +63,7 @@ dependencies = [
   "tqdm",
   "transformers==4.57.1",
   "uvicorn",
-  "uvloop",
+  "uvloop==0.21.0",
   # "xgrammar==0.1.24", , xgrammar depends on CUDA PyTorch and Triton only
   "grpcio==1.75.1", # keep it align with compile_proto.py
   "grpcio-tools==1.75.1", # keep it align with compile_proto.py