diff --git a/package.json b/package.json
index b176d1e6..7f91e1c6 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,6 @@
   "dependencies": {
     "@neoconfetti/react": "^1.0.0",
     "chromatic": "^13.3.3",
-    "filesize": "^10.0.12",
     "jsonfile": "^6.1.0",
     "strip-ansi": "^7.1.0"
   },
diff --git a/src/buildSteps.ts b/src/buildSteps.ts
index 1a3dcf83..f2da81d9 100644
--- a/src/buildSteps.ts
+++ b/src/buildSteps.ts
@@ -1,5 +1,5 @@
 import { TaskName } from 'chromatic/node';
-import { filesize } from 'filesize';
+import { formatBytesObject } from './utils/formatBytes';
 
 import { KnownStep, LocalBuildProgress, StepProgressPayload } from './types';
 
@@ -52,13 +52,9 @@ export const BUILD_STEP_CONFIG: Record<
     renderProgress: ({ stepProgress }) => {
       const { numerator, denominator } = stepProgress.upload;
       if (!denominator || !numerator) return `Uploading files...`;
-      const { value: total, exponent } = filesize(denominator, {
-        output: 'object',
-        round: 1,
-      });
-      const { value: progress, symbol } = filesize(numerator, {
-        exponent,
-        output: 'object',
+      const { value: total, exponent } = formatBytesObject(denominator, { round: 1 });
+      const { value: progress, symbol } = formatBytesObject(numerator, {
+        exponent: exponent,
         round: 1,
       });
       return `Uploading files... ${progress}/${total} ${symbol}`;
diff --git a/src/utils/formatBytes.ts b/src/utils/formatBytes.ts
new file mode 100644
index 00000000..6f57451a
--- /dev/null
+++ b/src/utils/formatBytes.ts
@@ -0,0 +1,26 @@
+export type FormatBytesObject = {
+  value: number;
+  symbol: string;
+  exponent: number;
+};
+
+export function formatBytesObject(
+  bytes: number,
+  options?: { exponent?: number; round?: number }
+): FormatBytesObject {
+  const UNITS = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+  const round = options?.round ?? 1;
+
+  if (!Number.isFinite(bytes) || bytes <= 0) {
+    return { value: 0, symbol: UNITS[0], exponent: 0 };
+  }
+
+  const computedExp = Math.min(UNITS.length - 1, Math.max(0, Math.floor(Math.log10(bytes) / 3)));
+  const exp = Math.min(UNITS.length - 1, Math.max(0, options?.exponent ?? computedExp));
+
+  const value = bytes / Math.pow(1000, exp);
+  const factor = Math.pow(10, round);
+  const rounded = Math.round(value * factor) / factor;
+
+  return { value: rounded, symbol: UNITS[exp], exponent: exp };
+}
diff --git a/yarn.lock b/yarn.lock
index 8717fe6c..4cb26281 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -477,7 +477,6 @@ __metadata:
     eslint-plugin-react-hooks: "npm:^5.0.0"
     eslint-plugin-simple-import-sort: "npm:^12.1.1"
     eslint-plugin-storybook: "npm:^9.0.0"
-    filesize: "npm:^10.0.12"
     graphql: "npm:^16.8.1"
     jsonfile: "npm:^6.1.0"
     msw: "npm:^2.0.0"
@@ -5345,13 +5344,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"filesize@npm:^10.0.12":
-  version: 10.1.6
-  resolution: "filesize@npm:10.1.6"
-  checksum: 10c0/9a196d64da4e947b8c0d294be09a3dfa7a634434a1fc5fb3465f1c9acc1237ea0363f245ba6e24477ea612754d942bc964d86e0e500905a72e9e0e17ae1bbdbc
-  languageName: node
-  linkType: hard
-
 "fill-range@npm:^7.1.1":
   version: 7.1.1
   resolution: "fill-range@npm:7.1.1"