diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5dc7f92..34043d00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+- Fix unicode characters not rendering correctly in webhooks @mderynck ([#3670](https://github.com/grafana/oncall/pull/3670))
+
 ## v1.3.84 (2024-01-10)
 
 ### Added
diff --git a/engine/apps/webhooks/tests/test_webhook.py b/engine/apps/webhooks/tests/test_webhook.py
index a86dd3b2..a0be802a 100644
--- a/engine/apps/webhooks/tests/test_webhook.py
+++ b/engine/apps/webhooks/tests/test_webhook.py
@@ -278,3 +278,21 @@ def test_escaping_payload_with_single_quote_in_string(make_organization, make_cu
     }
     request_kwargs = webhook.build_request_kwargs(payload)
     assert request_kwargs == {"headers": {}, "json": {"data": "{'text': \"Hi, it's alert\"}"}}
+
+
+@pytest.mark.django_db
+def test_escaping_unicode_in_string(make_organization, make_custom_webhook):
+    organization = make_organization()
+    webhook = make_custom_webhook(
+        organization=organization,
+        data='{"data" : "{{ alert_payload.text }}"}',
+        forward_all=False,
+    )
+
+    payload = {
+        "alert_payload": {
+            "text": "東京",
+        }
+    }
+    request_kwargs = webhook.build_request_kwargs(payload)
+    assert request_kwargs == {"headers": {}, "json": {"data": "東京"}}
diff --git a/engine/apps/webhooks/utils.py b/engine/apps/webhooks/utils.py
index 8599dd45..a7099559 100644
--- a/engine/apps/webhooks/utils.py
+++ b/engine/apps/webhooks/utils.py
@@ -82,7 +82,7 @@ def escape_string(string: str):
     json.dumps is the simples way to escape all special characters in string.
     First and last chars are quotes from json.dumps(), we don't need them, only escaping.
     """
-    return json.dumps(string)[1:-1]
+    return json.dumps(string, ensure_ascii=False)[1:-1]
 
 
 class EscapeDoubleQuotesDict(dict):