diff --git a/changedetectionio/processors/__init__.py b/changedetectionio/processors/__init__.py
index 0adc3b50..3ef718ff 100644
--- a/changedetectionio/processors/__init__.py
+++ b/changedetectionio/processors/__init__.py
@@ -75,12 +75,12 @@ class difference_detection_processor():
 
         proxy_url = None
         if preferred_proxy_id:
-            # Custom browser endpoints should not have a proxy added
-            if not preferred_proxy_id.startswith('ui-'):
+            # Custom browser endpoints should NOT have a proxy added
+            if not prefer_fetch_backend.startswith('extra_browser_'):
                 proxy_url = self.datastore.proxy_list.get(preferred_proxy_id).get('url')
                 logger.debug(f"Selected proxy key '{preferred_proxy_id}' as proxy URL '{proxy_url}' for {url}")
             else:
-                logger.debug(f"Skipping adding proxy data when custom Browser endpoint is specified.")
+                logger.debug(f"Skipping adding proxy data when custom Browser endpoint is specified. ")
 
         # Now call the fetcher (playwright/requests/etc) with arguments that only a fetcher would need.
         # When browser_connection_url is None, it method should default to working out whats the best defaults (os env vars etc)
diff --git a/requirements.txt b/requirements.txt
index c9233c17..79c63b63 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # Used by Pyppeteer
 pyee
 
-eventlet>=0.33.3 # related to dnspython fixes
+eventlet==0.33.3 # related to dnspython fixes
 feedgen~=0.9
 flask-compress
 # 0.6.3 included compatibility fix for werkzeug 3.x (2.x had deprecation of url handlers)
@@ -22,13 +22,15 @@ validators~=0.21
 brotli~=1.0
 requests[socks]
 
-urllib3>1.26
+urllib3==1.26.18
 chardet>2.3.0
 
 wtforms~=3.0
 jsonpath-ng~=1.5.3
 
-dnspython~=2.4 # related to eventlet fixes
+# Pinned: module 'eventlet.green.select' has no attribute 'epoll'
+# https://github.com/eventlet/eventlet/issues/805#issuecomment-1640463482
+dnspython==2.3.0 # related to eventlet fixes
 
 # jq not available on Windows so must be installed manually