diff --git a/package-lock.json b/package-lock.json
index 7d665ad..6fc2ab3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5855,6 +5855,31 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/encoding": {
+            "version": "0.1.13",
+            "resolved": "https://registry.npmjs.org/encoding/-/encoding-0.1.13.tgz",
+            "integrity": "sha512-ETBauow1T35Y/WZMkio9jiM0Z5xjHHmJ4XmjZOq1l/dXz3lr2sRn87nJy20RupqSh1F2m3HHPSp8ShIPQJrJ3A==",
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "iconv-lite": "^0.6.2"
+            }
+        },
+        "node_modules/encoding/node_modules/iconv-lite": {
+            "version": "0.6.3",
+            "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+            "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "safer-buffer": ">= 2.1.2 < 3.0.0"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
         "node_modules/end-of-stream": {
             "version": "1.4.5",
             "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
diff --git a/src/main/langserver.ts b/src/main/langserver.ts
index be11010..35efbd9 100644
--- a/src/main/langserver.ts
+++ b/src/main/langserver.ts
@@ -76,17 +76,17 @@ function ensureLspForKey(
         while (true) {
             const headerEnd = entry.buffer.indexOf("\r\n\r\n");
             if (headerEnd === -1) break;
-            const header = entry.buffer.slice(0, headerEnd).toString();
+            const header = entry.buffer.subarray(0, headerEnd).toString();
             const m = header.match(/Content-Length:\s*(\d+)/i);
             if (!m) {
                 // Malformed, drop
-                entry.buffer = entry.buffer.slice(headerEnd + 4);
+                entry.buffer = entry.buffer.subarray(headerEnd + 4);
                 continue;
             }
             const len = parseInt(m[1], 10);
             const totalLen = headerEnd + 4 + len;
             if (entry.buffer.length < totalLen) break; // wait for more
-            const body = entry.buffer.slice(headerEnd + 4, totalLen).toString();
+            const body = entry.buffer.subarray(headerEnd + 4, totalLen).toString();
             // Forward body to all attached ports
             try {
                 entry.ports.forEach((p) => {
@@ -103,7 +103,7 @@ function ensureLspForKey(
             } catch (err) {
                 console.warn("Failed to forward LSP message to renderer", err);
             }
-            entry.buffer = entry.buffer.slice(totalLen);
+            entry.buffer = entry.buffer.subarray(totalLen);
         }
     });