diff --git a/regexes.yaml b/regexes.yaml
index a8f8e097..f17f51f4 100644
--- a/regexes.yaml
+++ b/regexes.yaml
@@ -1022,10 +1022,9 @@ user_agent_parsers:
   # HTTrack crawler
   - regex: '\b(HTTrack) (\d+)\.(\d+)(?:[\.\-](\d+)|)'
 
-  # SerenityOS (https://serenityos.org)
-  # https://github.com/SerenityOS/serenity/blob/2e1bbcb0faeae92d7595b8e0b022a8cdcecca07e/Userland/Libraries/LibWeb/Loader/ResourceLoader.h#L27
-  - regex: 'SerenityOS'
-    family_replacement: 'SerenityOS Browser'
+  # Ladybird Browser (https://ladybird.dev)
+  # https://github.com/SerenityOS/serenity/blob/8da9ff24e4e720b1e80a027f09c419ac9503f896/Userland/Libraries/LibWeb/Loader/ResourceLoader.h#L52
+  - regex: 'LibWeb\+LibJS\/\d+\.\d+ (Ladybird)\/(\d+)\.(\d+)'
 
 os_parsers:
   ##########
diff --git a/tests/test_os.yaml b/tests/test_os.yaml
index eafd1092..5fbf17a7 100644
--- a/tests/test_os.yaml
+++ b/tests/test_os.yaml
@@ -3217,7 +3217,7 @@ test_cases:
     patch:
     patch_minor:
 
-  - user_agent_string: 'Mozilla/4.0 (SerenityOS; x86_64) LibWeb+LibJS (Not KHTML, nor Gecko) LibWeb'
+  - user_agent_string: 'Mozilla/5.0 (SerenityOS; x86_64) LibWeb+LibJS/1.0 Ladybird/1.0'
     family: 'SerenityOS'
     major:
     minor:
diff --git a/tests/test_ua.yaml b/tests/test_ua.yaml
index 2b2bee8c..2f57adb1 100644
--- a/tests/test_ua.yaml
+++ b/tests/test_ua.yaml
@@ -8664,10 +8664,10 @@ test_cases:
     minor: '20'
     patch: '1'
 
-  - user_agent_string: 'Mozilla/4.0 (SerenityOS; x86_64) LibWeb+LibJS (Not KHTML, nor Gecko) LibWeb'
-    family: 'SerenityOS Browser'
-    major:
-    minor:
+  - user_agent_string: 'Mozilla/5.0 (Linux; x86_64) LibWeb+LibJS/1.0 Ladybird/1.0'
+    family: 'Ladybird'
+    major: '1'
+    minor: '0'
     patch:
 
   - user_agent_string: 'surveyon/2.7.6 Mobile (Android: 11; MODEL:CPH2127; PRODUCT:CPH2127T2; MANUFACTURER:OPPO;)'