diff --git a/requirements.txt b/requirements.txt
index 00c29935..d985d333 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ aiohttp==3.8.4
 aiohttp-cors==0.7.0
 asyncpg==0.27.0
 jsonschema==4.17.3
-Cython==0.29.33
+Cython==0.29.34
 cyvcf2==0.30.18
 uvloop==0.17.0
 aiocache==0.11.1
diff --git a/setup.py b/setup.py
index 4403a2fe..0806bf24 100644
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@
         "vcf": [
             "numpy==1.24.2",
             "cyvcf2==0.30.18",
-            "Cython==0.29.33",
+            "Cython==0.29.34",
         ],
         "test": [
             "coverage==7.2.2",