diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62c52fc2d..a8dc1cccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Upgraded `browserslist` to `^4.28.8`. [#1624](https://github.com/sourcebot-dev/sourcebot/pull/1624)
+- Upgraded `postcss-selector-parser` to `^6.1.4`. [#1625](https://github.com/sourcebot-dev/sourcebot/pull/1625)
 
 ## [5.1.10] - 2026-08-27
 
diff --git a/package.json b/package.json
index 1373f3f4e..df0ace807 100644
--- a/package.json
+++ b/package.json
@@ -65,6 +65,7 @@
         "uuid": "^14.0.0",
         "fast-uri@npm:^3.0.1": "^3.1.2",
         "shell-quote@npm:1.8.3": "^1.8.4",
-        "ws@npm:~8.20.1": "^8.21.0"
+        "ws@npm:~8.20.1": "^8.21.0",
+        "postcss-selector-parser@npm:6.0.10": "^6.1.3"
     }
 }
diff --git a/yarn.lock b/yarn.lock
index 72e868b30..03a7ba84f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19447,23 +19447,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss-selector-parser@npm:6.0.10":
-  version: 6.0.10
-  resolution: "postcss-selector-parser@npm:6.0.10"
-  dependencies:
-    cssesc: "npm:^3.0.0"
-    util-deprecate: "npm:^1.0.2"
-  checksum: 10c0/a0b27c5e3f7604c8dc7cd83f145fdd7b21448e0d86072da99e0d78e536ba27aa9db2d42024c50aa530408ee517c4bdc0260529e1afb56608f9a82e839c207e82
-  languageName: node
-  linkType: hard
-
-"postcss-selector-parser@npm:^6.1.1, postcss-selector-parser@npm:^6.1.2":
-  version: 6.1.2
-  resolution: "postcss-selector-parser@npm:6.1.2"
+"postcss-selector-parser@npm:^6.1.1, postcss-selector-parser@npm:^6.1.2, postcss-selector-parser@npm:^6.1.3":
+  version: 6.1.4
+  resolution: "postcss-selector-parser@npm:6.1.4"
   dependencies:
     cssesc: "npm:^3.0.0"
     util-deprecate: "npm:^1.0.2"
-  checksum: 10c0/523196a6bd8cf660bdf537ad95abd79e546d54180f9afb165a4ab3e651ac705d0f8b8ce6b3164fb9e3279ce482c5f751a69eb2d3a1e8eb0fd5e82294fb3ef13e
+  checksum: 10c0/996f3290dee08ecb073d5f396d1134e619494cfd83140aec07a29618ee1e76d370769a8959d4c0cfefb24aa96dcffa4e7c4937dd881e03b735d50cba959ceb19
   languageName: node
   linkType: hard