diff --git a/code/Ch9/pyproject.toml b/code/Ch9/pyproject.toml
index 62d503c..f9f129c 100644
--- a/code/Ch9/pyproject.toml
+++ b/code/Ch9/pyproject.toml
@@ -6,7 +6,7 @@ requires-python = ">=3.12.11"
 dependencies = [
     "adagio==0.2.6",
     "aiohappyeyeballs==2.6.1",
-    "aiohttp==3.13.0",
+    "aiohttp==3.13.3",
     "aiosignal==1.4.0",
     "appdirs==1.4.4",
     "appnope==0.1.4",
diff --git a/code/Ch9/requirements.in b/code/Ch9/requirements.in
index 2af5924..64f788c 100644
--- a/code/Ch9/requirements.in
+++ b/code/Ch9/requirements.in
@@ -1,4 +1,4 @@
-aiohttp==3.13.0
+aiohttp==3.13.3
 darts==0.38.0
 ipykernel==6.30.1
 pipdeptree==2.28.0