diff --git a/web/workspace/deno.lock b/web/workspace/deno.lock
index f9c2ed9a..1099576b 100644
--- a/web/workspace/deno.lock
+++ b/web/workspace/deno.lock
@@ -3,6 +3,7 @@
   "specifiers": {
     "npm:@codemirror/state@6.5.2": "6.5.2",
     "npm:@codemirror/view@6.38.8": "6.38.8",
+    "npm:@fontsource/ibm-plex-mono@5.3.0": "5.3.0",
     "npm:@sveltejs/adapter-static@3.0.9": "3.0.9_@sveltejs+kit@2.49.4__@sveltejs+vite-plugin-svelte@6.2.1___svelte@5.45.6___vite@7.2.7__svelte@5.45.6__typescript@5.9.3__vite@7.2.7_@sveltejs+vite-plugin-svelte@6.2.1__svelte@5.45.6__vite@7.2.7_svelte@5.45.6_typescript@5.9.3_vite@7.2.7",
     "npm:@sveltejs/kit@2.49.4": "2.49.4_@sveltejs+vite-plugin-svelte@6.2.1__svelte@5.45.6__vite@7.2.7_svelte@5.45.6_typescript@5.9.3_vite@7.2.7",
     "npm:@sveltejs/vite-plugin-svelte@6.2.1": "6.2.1_svelte@5.45.6_vite@7.2.7",
@@ -178,6 +179,9 @@
       "os": ["win32"],
       "cpu": ["x64"]
     },
+    "@fontsource/ibm-plex-mono@5.3.0": {
+      "integrity": "sha512-eTgnZjZEGk1QtD3ZstF+Vclo2HLAni8YMy34/DxllwZvyz1lR/1RF/xTiAquOBO7MvqBx8D2Ig2WCPMVfdZu7Q=="
+    },
     "@jridgewell/gen-mapping@0.3.13": {
       "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
       "dependencies": [
@@ -1185,6 +1189,7 @@
     ],
     "packageJson": {
       "dependencies": [
+        "npm:@fontsource/ibm-plex-mono@5.3.0",
         "npm:@tailwindcss/vite@^4.1.17",
         "npm:gen-interface-jp@0.8.0",
         "npm:tailwindcss@^4.1.17"
diff --git a/web/workspace/package.json b/web/workspace/package.json
index 79bba045..250ea940 100644
--- a/web/workspace/package.json
+++ b/web/workspace/package.json
@@ -4,6 +4,7 @@
   "private": true,
   "type": "module",
   "dependencies": {
+    "@fontsource/ibm-plex-mono": "5.3.0",
     "gen-interface-jp": "0.8.0"
   },
   "devDependencies": {
diff --git a/web/workspace/src/app.css b/web/workspace/src/app.css
index d00433bc..fa887274 100644
--- a/web/workspace/src/app.css
+++ b/web/workspace/src/app.css
@@ -3,6 +3,10 @@
 @import 'gen-interface-jp/500.css';
 @import 'gen-interface-jp/600.css';
 @import 'gen-interface-jp/700.css';
+@import '@fontsource/ibm-plex-mono/latin-400.css';
+@import '@fontsource/ibm-plex-mono/latin-500.css';
+@import '@fontsource/ibm-plex-mono/latin-600.css';
+@import '@fontsource/ibm-plex-mono/latin-700.css';
 @layer reset, tokens, base, layout, components;
 @layer reset {
 	*,
@@ -56,10 +60,10 @@
 		--radius-panel: 12px;
 		--interactive-hover: oklch(94.5% 0 0);
 		--interactive-selected: oklch(93% 0.02 230);
-		--font-sans: "Gen Interface JP", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
-            "Segoe UI", sans-serif;
-		--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
-            "Liberation Mono", monospace;
+		--font-sans: "Gen Interface JP", Inter, ui-sans-serif, system-ui,
+			-apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+		--font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo,
+			Monaco, Consolas, "Liberation Mono", monospace;
 	}
 	@media (prefers-color-scheme: dark) {
 		:root {
diff --git a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
index 34fc3d64..725531bf 100644
--- a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
+++ b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
@@ -9,7 +9,7 @@ function assert(condition: unknown, message: string): asserts condition {
   }
 }
 
-Deno.test("workspace app css uses bundled Gen Interface JP font", async () => {
+Deno.test("workspace app css uses bundled UI fonts", async () => {
   const appCss = await Deno.readTextFile(new URL("./../../../app.css", import.meta.url));
   assert(
     appCss.includes("gen-interface-jp/400.css") &&
@@ -19,6 +19,14 @@ Deno.test("workspace app css uses bundled Gen Interface JP font", async () => {
       appCss.includes('"Gen Interface JP", Inter'),
     "global app css should import the tracked Gen Interface JP weights and prefer it in the sans font stack",
   );
+  assert(
+    appCss.includes("@fontsource/ibm-plex-mono/latin-400.css") &&
+      appCss.includes("@fontsource/ibm-plex-mono/latin-500.css") &&
+      appCss.includes("@fontsource/ibm-plex-mono/latin-600.css") &&
+      appCss.includes("@fontsource/ibm-plex-mono/latin-700.css") &&
+      appCss.includes('"IBM Plex Mono", ui-monospace'),
+    "global app css should import the tracked IBM Plex Mono weights and prefer it in the mono font stack",
+  );
 });
 
 Deno.test("workspace Worker list lives on the dedicated Workers page", async () => {