diff --git a/ui/frontend/package.json b/ui/frontend/package.json
index 8e64f0593..428bbc7cf 100644
--- a/ui/frontend/package.json
+++ b/ui/frontend/package.json
@@ -6,7 +6,7 @@
   "dependencies": {
     "@floating-ui/react": "^0.24.0",
     "@reduxjs/toolkit": "^1.8.5",
-    "ace-builds": "1.22.1",
+    "ace-builds": "^1.23.0",
     "common-tags": "^1.8.0",
     "core-js": "^3.1.3",
     "history": "^5.3.0",
diff --git a/ui/frontend/webpack.config.js b/ui/frontend/webpack.config.js
index 9f16b2231..431883e7c 100644
--- a/ui/frontend/webpack.config.js
+++ b/ui/frontend/webpack.config.js
@@ -19,6 +19,7 @@ const allKeybindingNames =
 const allThemeNames =
       globSync('./node_modules/ace-builds/src-noconflict/theme-*.js')
       .map(basename)
+      .filter(n => !n.endsWith('-css'))
       .map(n => n.replace(/^theme-/, ''));
 
 // There's a builtin/default keybinding that we call `ace`.
diff --git a/ui/frontend/yarn.lock b/ui/frontend/yarn.lock
index 9d262c21d..78b1fbe8b 100644
--- a/ui/frontend/yarn.lock
+++ b/ui/frontend/yarn.lock
@@ -1978,10 +1978,10 @@
   resolved "https://registry.yarnpkg.com/@xtuc/long/-/long-4.2.2.tgz#d291c6a4e97989b5c61d9acf396ae4fe133a718d"
   integrity sha512-NuHqBY1PB/D8xU6s/thBgOAiAP7HOYDQ32+BFZILJ8ivkUkAHQnWfn6WhL79Owj1qmUnoN/YPhktdIoucipkAQ==
 
-ace-builds@1.22.1:
-  version "1.22.1"
-  resolved "https://registry.yarnpkg.com/ace-builds/-/ace-builds-1.22.1.tgz#3d765d1cfffc79226e372b6353750fd997816154"
-  integrity sha512-o5RGTPBIiRxguWNors3pT6KuLqj0a2NvNLoqir7/2LLiFm34PJV3BMq4sl9kjPayo4+lmd99m6zAq+XPdhyHQA==
+ace-builds@^1.23.0:
+  version "1.23.1"
+  resolved "https://registry.yarnpkg.com/ace-builds/-/ace-builds-1.23.1.tgz#2a1a2c2717c21cfd102f641552cf371ab6bce6e4"
+  integrity sha512-vmLfsfOOvEiQPri2Vz+76FvUalz/nHB7+X2GqonG7rc2V+WrHvqc4xYowt1+fxHH3aWw/pDF2jqKQrd8JNMmiQ==
 
 acorn-import-assertions@^1.9.0:
   version "1.9.0"