diff --git a/codelist_generator/requirements.txt b/codelist_generator/requirements.txt
index a4e7103..3dc5b97 100644
--- a/codelist_generator/requirements.txt
+++ b/codelist_generator/requirements.txt
@@ -7,7 +7,7 @@ h2==3.2.0
 hpack==3.0.0
 hstspreload==2024.7.1
 httpcore==0.9.1
-httpx==0.13.3
+httpx==0.23.0
 hyperframe==5.2.0
 idna==2.10
 numpy==2.0.0