diff --git a/package-lock.json b/package-lock.json
index b73c3db..25ab797 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,12 +26,11 @@
         "tiny-inflate": "^1.0.3",
         "unicode-properties": "^1.4.0",
         "unicode-trie": "^2.0.0",
-        "x11": "^4.1.0",
-        "x11-dri": "0.9.1"
+        "x11": "^4.1.0"
       },
       "devDependencies": {
         "@conventional-commits/parser": "^0.4.1",
-        "katex": "^0.18.1"
+        "katex": "^0.19.1"
       },
       "engines": {
         "node": ">=18.19.0"
@@ -52,13 +51,10 @@
       }
     },
     "node_modules/@swc/helpers": {
-      "version": "0.5.23",
-      "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.23.tgz",
-      "integrity": "sha512-5lSsMOTXURePglDfvuAQUqkGek9Hg2kksOYay2m0+XR++b2NWYL/4sWyuvVBIs8oKnJaxkdi9whaL/sqN13afw==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "tslib": "^2.8.0"
-      }
+      "version": "0.5.24",
+      "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.24.tgz",
+      "integrity": "sha512-6tcXo4kA8HgGO7AVmawB57RYi/piBPYVHVcO6dXjX+SZw8GoHmi262sp4v2Ha2kNP9Cx84qei27yT+fjS1lxgg==",
+      "license": "Apache-2.0"
     },
     "node_modules/@types/unist": {
       "version": "2.0.11",
@@ -272,9 +268,9 @@
       "license": "BSD-3-Clause"
     },
     "node_modules/katex": {
-      "version": "0.18.10",
-      "resolved": "https://registry.npmjs.org/katex/-/katex-0.18.10.tgz",
-      "integrity": "sha512-/B6p9eY9DX7aHBfpkHdpirDTZ5QH9xTwL9y837PWuzuv41O5jFdqNQwVQEQsimY0/iVNkwBY4+4hMfhQ7d4Dbw==",
+      "version": "0.19.1",
+      "resolved": "https://registry.npmjs.org/katex/-/katex-0.19.1.tgz",
+      "integrity": "sha512-jG8uKntjSEcm2EpQOh0XturpPuuC9r3Sq5HLHdsFdWZT27E672SF19QEi+of0/YeOy15lDgRhKvr5614uRrEfA==",
       "dev": true,
       "funding": [
         "https://opencollective.com/katex",
@@ -361,12 +357,6 @@
       "integrity": "sha512-pkY1fj1cKHb2seWDy0B16HeWyczlJA9/WW3u3c4z/NiWDsO3DOU5D7nhTLE9CF0yXv/QZFY7sEJmj24dK+Rrqw==",
       "license": "MIT"
     },
-    "node_modules/tslib": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
-      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-      "license": "0BSD"
-    },
     "node_modules/unicode-properties": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/unicode-properties/-/unicode-properties-1.4.1.tgz",
@@ -430,9 +420,9 @@
       }
     },
     "node_modules/x11": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/x11/-/x11-4.2.3.tgz",
-      "integrity": "sha512-bOO/uu8snPD/lYq5J0f1JJK6wWOOhlTbEiDS7YDH27BFhTyoN/thcirQ1wOSiBJtX6IqgXCJh73LAiCyNs0Eiw==",
+      "version": "4.3.3",
+      "resolved": "https://registry.npmjs.org/x11/-/x11-4.3.3.tgz",
+      "integrity": "sha512-scSNghvfgr4ak9tLt3jEAeldE0U641nyLfPPy17he5FrLKCLdSyvWoaTyCFHRPWZ5qldrEe8jeMNTAqm0aKWDg==",
       "engines": {
         "node": ">=18"
       }
diff --git a/package.json b/package.json
index d3304ed..fcf3013 100644
--- a/package.json
+++ b/package.json
@@ -73,6 +73,6 @@
   },
   "devDependencies": {
     "@conventional-commits/parser": "^0.4.1",
-    "katex": "^0.18.1"
+    "katex": "^0.19.1"
   }
 }
diff --git a/test/stroke-joins.test.js b/test/stroke-joins.test.js
index c6b7b36..b85bdd9 100644
--- a/test/stroke-joins.test.js
+++ b/test/stroke-joins.test.js
@@ -130,9 +130,14 @@ test('and the whole square is symmetric, at every width and join', async () => {
         square(ctx);
       });
       const { worst, where } = asymmetry(at);
-      // 1 is antialiasing rounding on the two axes; a missing join is a
-      // whole corner, which reads as 255 minus its edge coverage
-      assert.ok(worst <= 1, `${join} lineWidth ${lw}: asymmetry ${worst} at ${where}`);
+      // An odd width puts the edges on half pixels, and RENDER's Precise
+      // grid samples a pixel 17 columns by 15 rows: a half-covered pixel
+      // reads 119 or 136 along a horizontal edge, 120 or 135 along a
+      // vertical one, so the quarter turn costs up to 16 levels. XQuartz
+      // and node-x11's own server since 4.3.0 both give exactly that. A
+      // missing join is a whole corner: at least 71 levels at lineWidth 1,
+      // 255 from 2 up.
+      assert.ok(worst <= 16, `${join} lineWidth ${lw}: asymmetry ${worst} at ${where}`);
     }
   }
 });
diff --git a/test/xserver.test.js b/test/xserver.test.js
index 7f3a99e..5c70022 100644
--- a/test/xserver.test.js
+++ b/test/xserver.test.js
@@ -778,8 +778,8 @@ test('protocol: AddTraps accumulates antialiased coverage', async () => {
   Render.CreatePicture(picId, pid, Render.a8);
   Render.FillRectangles(Render.PictOp.Src, picId, [0, 0, 0, 0], [0, 0, 8, 8]);
 
-  // half-pixel-tall full-width span: expect ~50% coverage on row 2, and two
-  // adds on the same span must accumulate to ~100%
+  // half-pixel-tall full-width span: about half coverage on row 2, and two
+  // more adds on the same span must accumulate to full coverage
   const span = [0, 8, 2, 0, 8, 2.5]; // top l/r/y, bottom l/r/y
   Render.AddTraps(picId, 0, 0, span);
   const one = await new Promise((resolve, reject) =>
@@ -787,7 +787,10 @@ test('protocol: AddTraps accumulates antialiased coverage', async () => {
   );
   // depth-8 GetImage: one byte per pixel, rows padded to 4 (8 is aligned)
   const alphaAt = (img, x, y) => img.data[y * 8 + x];
-  near(alphaAt(one, 4, 2), 128, 6, 'half-covered row');
+  // RENDER's Precise grid for a8 is 17 samples by 15 rows, the rows at
+  // 1/30 + k/15 of the pixel; the top half holds 7 of them, and 7 × 17 =
+  // 119. pixman servers give exactly this, as node-x11's has since 4.3.0.
+  assert.equal(alphaAt(one, 4, 2), 119, 'half-covered row');
   assert.equal(alphaAt(one, 4, 3), 0, 'row below untouched');
 
   Render.AddTraps(picId, 0, 0, span);