diff --git a/requirements.txt b/requirements.txt
index ecd27ed..3d7c2f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-urllib3<1.27,>1.21.1  # avoid caching bug
+urllib3>1.21.1,<2.3  # avoid caching bug
 requests_cache
 ckanapi>=3.5
 flask==3.0.3
diff --git a/setup.cfg b/setup.cfg
index 1c41dfa..2545bfa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,7 +21,7 @@ zip_safe = True
 packages = hxl_proxy
 python_requires = >=3.7
 install_requires =
-    urllib3<1.27,>1.21.1 # avoid caching bug
+    urllib3>1.21.1,<2.3 # avoid caching bug
     requests_cache
     ckanapi>=3.5
     flask>=2.2.5<2.3     # 2.3 messes up pip dependencies