diff --git a/package-lock.json b/package-lock.json
index d6e9cb10..05313c01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "9.0.0",
       "license": "SEE LICENSE IN https://tc39.es/ecma402/#sec-copyright-and-software-license",
       "dependencies": {
-        "@tc39/ecma262-biblio": "=2.1.3014",
+        "@tc39/ecma262-biblio": "=2.1.3018",
         "ecmarkup": "^22.0.0"
       }
     },
@@ -195,7 +195,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=18"
       },
@@ -218,7 +217,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -290,9 +288,9 @@
       }
     },
     "node_modules/@tc39/ecma262-biblio": {
-      "version": "2.1.3014",
-      "resolved": "https://registry.npmjs.org/@tc39/ecma262-biblio/-/ecma262-biblio-2.1.3014.tgz",
-      "integrity": "sha512-BYxwDmRN2So2kwZccBiX1r5pakeIEMX7JdEjV2tx1QJi5jBC/ky/yV5Rx08VyUnxhTmyIZV1U5sjD4H1aP4WOw==",
+      "version": "2.1.3018",
+      "resolved": "https://registry.npmjs.org/@tc39/ecma262-biblio/-/ecma262-biblio-2.1.3018.tgz",
+      "integrity": "sha512-kWFnmj5NWeMEvZ2unIdKL8aHBqTdlUwQ+J1Eh2hgmJBxxLGvnocwpjPtx6SItOpocteHs5dblmup4hqBnpSadg==",
       "license": "SEE LICENSE IN LICENSE.md"
     },
     "node_modules/agent-base": {
diff --git a/package.json b/package.json
index 0e878094..8939a1e5 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,6 @@
   "homepage": "https://tc39.es/ecma402/",
   "dependencies": {
     "ecmarkup": "^22.0.0",
-    "@tc39/ecma262-biblio": "=2.1.3014"
+    "@tc39/ecma262-biblio": "=2.1.3018"
   }
 }
diff --git a/spec/numberformat.html b/spec/numberformat.html
index fa31c7b5..5adbe17f 100644
--- a/spec/numberformat.html
+++ b/spec/numberformat.html
@@ -1533,13 +1533,13 @@ <h1>
           1. Return 0.
         1. If _x_ &lt; 0, then
           1. Let _x_ = -_x_.
-        1. Let _magnitude_ be the base 10 logarithm of _x_ rounded down to the nearest integer.
+        1. Let _magnitude_ be floor(log10(_x_)).
         1. Let _exponent_ be ComputeExponentForMagnitude(_numberFormat_, _magnitude_).
         1. Let _x_ be _x_ × 10<sup>-_exponent_</sup>.
         1. Let _formatNumberResult_ be FormatNumericToString(_numberFormat_, _x_).
         1. If _formatNumberResult_.[[RoundedNumber]] = 0, then
           1. Return _exponent_.
-        1. Let _newMagnitude_ be the base 10 logarithm of _formatNumberResult_.[[RoundedNumber]] rounded down to the nearest integer.
+        1. Let _newMagnitude_ be floor(log10(_formatNumberResult_.[[RoundedNumber]])).
         1. If _newMagnitude_ is _magnitude_ - _exponent_, then
           1. Return _exponent_.
         1. Return ComputeExponentForMagnitude(_numberFormat_, _magnitude_ + 1).