diff --git a/README.md b/README.md
index dad94de..d55904d 100644
--- a/README.md
+++ b/README.md
@@ -61,3 +61,16 @@ isort .
 ```
 
 > 🔒 Never commit `.env` or credentials!
+
+### Production SSL Setup (for internal Redmine)
+
+If you get `CERTIFICATE_VERIFY_FAILED`, your corporate CA is not trusted by Python's `certifi`.
+
+Fix it once per environment:
+
+```bash
+source .venv/bin/activate
+cat /etc/ssl/certs/ca-certificates.crt >> $(python -m certifi)
+```
+
+> This appends system CA bundle to Python's certificate store. Safe and secure.
diff --git a/redmine_reporter/client.py b/redmine_reporter/client.py
index fc53718..80e1b87 100644
--- a/redmine_reporter/client.py
+++ b/redmine_reporter/client.py
@@ -12,7 +12,8 @@ def fetch_issues_by_time_entries(from_date: str, to_date: str) -> Optional[List[
     redmine = Redmine(
         Config.REDMINE_URL,
         username=Config.REDMINE_USER,
-        password=Config.REDMINE_PASSWORD
+        password=Config.REDMINE_PASSWORD,
+        requests={'verify': '/etc/ssl/certs/ca-certificates.crt'}
     )
 
     current_user = redmine.user.get('current')