diff --git a/bublik/data/schemas/meta.json b/bublik/data/schemas/meta.json
index f4f83e26..8767fd3f 100644
--- a/bublik/data/schemas/meta.json
+++ b/bublik/data/schemas/meta.json
@@ -68,7 +68,8 @@
                     "description": "List of patterns for assigning metas to the category",
                     "items": {
                         "type": "string",
-                        "minLength": 1
+                        "minLength": 1,
+                        "format": "regex"
                     },
                     "uniqueItems": true
                 }
diff --git a/bublik/data/schemas/references.json b/bublik/data/schemas/references.json
index 3b95b6ee..5df17250 100644
--- a/bublik/data/schemas/references.json
+++ b/bublik/data/schemas/references.json
@@ -15,8 +15,10 @@
                     "uri": {
                         "type": "array",
                         "items": {
-                            "type": "string"
+                            "type": "string",
+                            "pattern": "^https?://"
                         },
+                        "minItems": 1,
                         "uniqueItems": true
                     }
                 },
@@ -26,6 +28,7 @@
                 ],
                 "additionalProperties": false
             },
+            "minItems": 1,
             "uniqueItems": true,
             "default": [
                 {
@@ -46,7 +49,8 @@
                         "type": "string"
                     },
                     "uri": {
-                        "type": "string"
+                        "type": "string",
+                        "pattern": "^https?://"
                     }
                 },
                 "required": [
@@ -66,7 +70,8 @@
                         "type": "string"
                     },
                     "uri": {
-                        "type": "string"
+                        "type": "string",
+                        "pattern": "^https?://"
                     }
                 },
                 "required": [
diff --git a/bublik/data/serializers/config.py b/bublik/data/serializers/config.py
index 2a382f54..3c18b10b 100644
--- a/bublik/data/serializers/config.py
+++ b/bublik/data/serializers/config.py
@@ -7,7 +7,7 @@
 from django.contrib.auth import get_user_model
 from django.db import transaction
 import jsonschema
-from jsonschema import validate
+from jsonschema import FormatChecker, validate
 from rest_framework import serializers
 from rest_framework.serializers import ModelSerializer
 
@@ -117,7 +117,7 @@ def ensure_json(config_content):
         json_schema = ConfigServices.get_schema(config_type, config_name)
         if json_schema:
             try:
-                validate(instance=content, schema=json_schema)
+                validate(instance=content, schema=json_schema, format_checker=FormatChecker())
             except jsonschema.exceptions.ValidationError as jeve:
                 jeve_msg = jeve.message[0].lower() + jeve.message[1:]
                 msg = f'Invalid format: {jeve_msg}'