diff --git a/package.json b/package.json
index 77a6f12811..10cffd12ce 100644
--- a/package.json
+++ b/package.json
@@ -106,7 +106,6 @@
     "eslint-import-resolver-webpack": "^0.13.0",
     "eslint-plugin-import": "^2.22.0",
     "eslint-plugin-unicorn": "^35.0.0",
-    "js-yaml": "^4.0.0",
     "jsdom": "^17.0.0",
     "mockdate": "^3.0.2",
     "node-fetch": "^2.6.1",
@@ -125,6 +124,7 @@
     "vnu-jar": "^21.2.5",
     "webpack-dev-server": "^3.5.1",
     "xvfb": "^0.4.0",
+    "yaml": "^2.0.0-8",
     "yarn-deduplicate": "^3.0.0",
     "zulip-js": "^2.0.8"
   },
diff --git a/tools/check-openapi b/tools/check-openapi
index cf4cc9a39b..952d5e467b 100755
--- a/tools/check-openapi
+++ b/tools/check-openapi
@@ -4,73 +4,79 @@
 
 const fs = require("fs");
 
-const jsyaml = require("js-yaml");
 const ExampleValidator = require("openapi-examples-validator");
 const SwaggerParser = require("swagger-parser");
+const {LineCounter, Scalar, YAMLMap, YAMLSeq, parseDocument, visit} = require("yaml");
+
+async function checkFile(file) {
+    const yaml = await fs.promises.readFile(file, "utf8");
+    const lineCounter = new LineCounter();
+    const doc = parseDocument(yaml, {lineCounter});
+    if (doc.errors.length > 0) {
+        for (const error of doc.errors) {
+            console.error("%s: %s", file, error.message);
+        }
+        process.exitCode = 1;
+        return;
+    }
+
+    const root = doc.contents;
+    if (!(root instanceof YAMLMap && root.has("openapi"))) {
+        return;
+    }
 
-function checkRefSiblings(file, path, data) {
     let ok = true;
-    if (typeof data === "object" && data !== null) {
-        if (
-            "allOf" in data &&
-            Object.values(data.allOf).filter((subschema) => !("$ref" in subschema)).length > 1
-        ) {
-            console.error(
-                `${file}: Too many inline allOf subschemas at ${JSON.stringify(
-                    path,
-                )}: ${JSON.stringify(data, undefined, 2)}`,
-            );
-            ok = false;
-        }
-        if ("$ref" in data && Object.entries(data).length !== 1) {
-            console.error(
-                `${file}: Siblings of $ref have no effect at ${JSON.stringify(
-                    path,
-                )}: ${JSON.stringify(data, undefined, 2)}`,
-            );
-            ok = false;
-        }
-        for (const [key, child] of Array.isArray(data) ? data.entries() : Object.entries(data)) {
-            if (!checkRefSiblings(file, [...path, key], child)) {
+
+    visit(doc, {
+        Map(key, node) {
+            if (node.has("$ref") && node.items.length !== 1) {
+                const {line, col} = lineCounter.linePos(node.range[0]);
+                console.error("%s:%d:%d: Siblings of $ref have no effect", file, line, col);
                 ok = false;
             }
-        }
+        },
+
+        Pair(key, node) {
+            if (
+                node.key instanceof Scalar &&
+                node.key.value === "allOf" &&
+                node.value instanceof YAMLSeq &&
+                node.value.items.filter(
+                    (subschema) => !(subschema instanceof YAMLMap && subschema.has("$ref")),
+                ).length > 1
+            ) {
+                const {line, col} = lineCounter.linePos(node.value.range[0]);
+                console.error("%s:%d:%d: Too many inline allOf subschemas", file, line, col);
+                ok = false;
+            }
+        },
+    });
+
+    if (!ok) {
+        process.exitCode = 1;
+    }
+
+    try {
+        await SwaggerParser.validate(file);
+    } catch (error) {
+        if (!(error instanceof SyntaxError)) {
+            throw error;
+        }
+        console.error("%s: %s", file, error.message);
+        process.exitCode = 1;
+    }
+    const res = await ExampleValidator.validateFile(file);
+    if (!res.valid) {
+        for (const error of res.errors) {
+            console.error(error);
+        }
+        process.exitCode = 1;
     }
-    return ok;
 }
 
 (async () => {
-    // Iterate through the changed files, passed in the arguments.
-    // The two first arguments are the call to the Node interpreter and this
-    // script, hence the starting point at 2.
     for (const file of process.argv.slice(2)) {
-        try {
-            const data = jsyaml.load(await fs.promises.readFile(file, "utf8"), {
-                filename: file,
-            });
-            if (data.openapi !== undefined) {
-                if (!checkRefSiblings(file, [], data)) {
-                    process.exitCode = 1;
-                }
-                await SwaggerParser.validate(file);
-                const res = await ExampleValidator.validateFile(file);
-                if (!res.valid) {
-                    for (const error of res.errors) {
-                        console.error(error);
-                    }
-                    process.exitCode = 1;
-                }
-            }
-        } catch (error) {
-            if (error instanceof jsyaml.YAMLException) {
-                console.error(error.message);
-            } else if (error instanceof SyntaxError) {
-                console.error(`${file}: ${error.message}`);
-            } else {
-                throw error;
-            }
-            process.exitCode = 1;
-        }
+        await checkFile(file);
     }
 })().catch((error) => {
     console.error(error);
diff --git a/version.py b/version.py
index 8b27eac55f..e26f90ab55 100644
--- a/version.py
+++ b/version.py
@@ -48,4 +48,4 @@ API_FEATURE_LEVEL = 96
 #   historical commits sharing the same major version, in which case a
 #   minor version bump suffices.
 
-PROVISION_VERSION = "157.1"
+PROVISION_VERSION = "157.2"
diff --git a/yarn.lock b/yarn.lock
index a65ad91827..3ef8369da5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8349,7 +8349,7 @@ js-yaml@^3.13.1:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
-js-yaml@^4.0.0, js-yaml@^4.1.0:
+js-yaml@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.1.0.tgz#c1fb65f8f5017901cdd2c951864ba18458a10602"
   integrity sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==
@@ -14926,6 +14926,11 @@ yaml@^1.10.0, yaml@^1.10.2, yaml@^1.7.2:
   resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.10.2.tgz#2301c5ffbf12b467de8da2333a459e29e7920e4b"
   integrity sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg==
 
+yaml@^2.0.0-8:
+  version "2.0.0-8"
+  resolved "https://registry.yarnpkg.com/yaml/-/yaml-2.0.0-8.tgz#226365f0d804ba7fb8cc2b527a00a7a4a3d8ea5f"
+  integrity sha512-QaYgJZMfWD6fKN/EYMk6w1oLWPCr1xj9QaPSZW5qkDb3y8nGCXhy2Ono+AF4F+CSL/vGcqswcAT0BaS//pgD2A==
+
 yargs-parser@^13.1.2:
   version "13.1.2"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-13.1.2.tgz#130f09702ebaeef2650d54ce6e3e5706f7a4fb38"