diff --git a/CHANGELOG.md b/CHANGELOG.md
index abb9d0f07f..53f0dfd39c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
 - Extract `user.geo.country_code` into span indexed. ([#3911](https://github.com/getsentry/relay/pull/3911))
 - Add `span.system` tag to span metrics ([#3913](https://github.com/getsentry/relay/pull/3913))
 - Switch glob implementations from `regex` to `regex-lite`. ([#3926](https://github.com/getsentry/relay/pull/3926))
+- Disables unicode support in user agent regexes. ([#3929](https://github.com/getsentry/relay/pull/3929))
 - Extract client sdk from transaction into profiles. ([#3915](https://github.com/getsentry/relay/pull/3915))
 - Extract `user.geo.subregion` into span metrics/indexed. ([#3914](https://github.com/getsentry/relay/pull/3914))
 - Add `last_peek` field to the `Priority` struct. ([#3922](https://github.com/getsentry/relay/pull/3922))
diff --git a/relay-ua/src/lib.rs b/relay-ua/src/lib.rs
index 38556ae49c..f1594469a5 100644
--- a/relay-ua/src/lib.rs
+++ b/relay-ua/src/lib.rs
@@ -17,7 +17,9 @@ pub use uaparser::{Device, UserAgent, OS};
 /// For usage, see [`Parser`].
 static UA_PARSER: Lazy<UserAgentParser> = Lazy::new(|| {
     let ua_regexes = include_bytes!("../uap-core/regexes.yaml");
-    UserAgentParser::from_bytes(ua_regexes)
+    UserAgentParser::builder()
+        .with_unicode_support(false)
+        .build_from_bytes(ua_regexes)
         .expect("Could not create UserAgent. You are probably using a bad build of relay.")
 });