diff --git a/src/commands/optimize.ts b/src/commands/optimize.ts
index 55d27277..be9f5ae5 100644
--- a/src/commands/optimize.ts
+++ b/src/commands/optimize.ts
@@ -44,6 +44,7 @@ type PackageJson = Awaited<ReturnType<typeof readPackageJson>>
 
 const {
   BUN,
+  LOCK_EXT,
   NPM,
   PNPM,
   UPDATE_SOCKET_OVERRIDES_IN_PACKAGE_LOCK_FILE,
@@ -136,10 +137,13 @@ const lockIncludesByAgent: Record<Agent, AgentLockIncludesFn> = (() => {
 
   return {
     [BUN](lockSrc: string, name: string, lockBasename?: string) {
-      return (lockBasename === '.lock' ? npmLockIncludes : yarnLockIncludes)(
-        lockSrc,
-        name
-      )
+      // This is a bit counterintuitive. When lockBasename ends with a .lockb
+      // we treat it as a yarn.lock. When lockBasename ends with a .lock we
+      // treat it as a package-lock.json. The bun.lock format is not identical
+      // package-lock.json, however it close enough for npmLockIncludes to work.
+      const lockScanner =
+        lockBasename?.endsWith(LOCK_EXT) ? npmLockIncludes : yarnLockIncludes
+      return lockScanner(lockSrc, name)
     },
     [NPM]: npmLockIncludes,
     [PNPM](lockSrc: string, name: string) {
@@ -659,6 +663,10 @@ async function addOverrides(
   const thingToScan = isLockScanned
     ? lockSrc
     : await lsByAgent[agent](agentExecPath, pkgPath, { npmExecPath })
+  // The AgentDepsIncludesFn and AgentLockIncludesFn types overlap in their
+  // first two parameters. AgentLockIncludesFn accepts an optional third
+  // parameter which AgentDepsIncludesFn will ignore so we cast thingScanner
+  // as an AgentLockIncludesFn type.
   const thingScanner = <AgentLockIncludesFn>(
     (isLockScanned ? lockIncludesByAgent[agent] : depsIncludesByAgent[agent])
   )
diff --git a/src/constants.ts b/src/constants.ts
index 19253046..441269db 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -9,11 +9,13 @@ type RegistryEnv = typeof registryConstants.ENV
 type Constants = {
   readonly API_V0_URL: 'https://api.socket.dev/v0'
   readonly BABEL_RUNTIME: '@babel/runtime'
+  readonly BINARY_LOCK_EXT: '.lockb'
   readonly BUN: 'bun'
   readonly ENV: RegistryEnv & {
     UPDATE_SOCKET_OVERRIDES_IN_PACKAGE_LOCK_FILE: boolean
   }
   readonly DIST_TYPE: 'module-sync' | 'require'
+  readonly LOCK_EXT: '.lock'
   readonly NPM_REGISTRY_URL: 'https://registry.npmjs.org'
   readonly NPX: 'npx'
   readonly PNPM: 'pnpm'
@@ -43,7 +45,9 @@ const {
 
 const API_V0_URL = 'https://api.socket.dev/v0'
 const BABEL_RUNTIME = '@babel/runtime'
+const BINARY_LOCK_EXT = '.lockb'
 const BUN = 'bun'
+const LOCK_EXT = '.lock'
 const NPM_REGISTRY_URL = 'https://registry.npmjs.org'
 const NPX = 'npx'
 const PNPM = 'pnpm'
@@ -105,10 +109,12 @@ const constants = <Constants>createConstantsObject(
   {
     API_V0_URL,
     BABEL_RUNTIME,
+    BINARY_LOCK_EXT,
     BUN,
     ENV: undefined,
     // Lazily defined values are initialized as `undefined` to keep their key order.
     DIST_TYPE: undefined,
+    LOCK_EXT,
     NPM_REGISTRY_URL,
     NPX,
     PNPM,
diff --git a/src/utils/package-manager-detector.ts b/src/utils/package-manager-detector.ts
index 621940ba..b60fbf46 100644
--- a/src/utils/package-manager-detector.ts
+++ b/src/utils/package-manager-detector.ts
@@ -16,7 +16,16 @@ import { existsSync, findUp, readFileBinary, readFileUtf8 } from './fs'
 import type { EditablePackageJson } from '@socketsecurity/registry/lib/packages'
 import type { SemVer } from 'semver'
 
-const { BUN, NPM, PNPM, VLT, YARN_BERRY, YARN_CLASSIC } = constants
+const {
+  BINARY_LOCK_EXT,
+  BUN,
+  LOCK_EXT,
+  NPM,
+  PNPM,
+  VLT,
+  YARN_BERRY,
+  YARN_CLASSIC
+} = constants
 
 export const AGENTS = [BUN, NPM, PNPM, YARN_BERRY, YARN_CLASSIC, VLT] as const
 export type Agent = (typeof AGENTS)[number]
@@ -46,9 +55,10 @@ async function getAgentVersion(
   return result
 }
 
+// The order of LOCKS properties IS significant as it affects iteration order.
 const LOCKS: Record<string, Agent> = {
-  'bun.lock': BUN,
-  'bun.lockb': BUN,
+  [`bun${LOCK_EXT}`]: BUN,
+  [`bun${BINARY_LOCK_EXT}`]: BUN,
   // If both package-lock.json and npm-shrinkwrap.json are present in the root
   // of a project, npm-shrinkwrap.json will take precedence and package-lock.json
   // will be ignored.
@@ -57,9 +67,9 @@ const LOCKS: Record<string, Agent> = {
   'package-lock.json': NPM,
   'pnpm-lock.yaml': PNPM,
   'pnpm-lock.yml': PNPM,
-  'yarn.lock': YARN_CLASSIC,
+  [`yarn${LOCK_EXT}`]: YARN_CLASSIC,
   'vlt-lock.json': VLT,
-  // Look for a hidden lock file if .npmrc has package-lock=false:
+  // Lastly, look for a hidden lock file which is present if .npmrc has package-lock=false:
   // https://docs.npmjs.com/cli/v10/configuring-npm/package-lock-json#hidden-lockfiles
   //
   // Unlike the other LOCKS keys this key contains a directory AND filename so
@@ -92,10 +102,10 @@ const readLockFileByAgent: Record<Agent, ReadLockFile> = (() => {
   return {
     [BUN]: wrapReader(async (lockPath: string, agentExecPath: string) => {
       const ext = path.extname(lockPath)
-      if (ext === '.lock') {
+      if (ext === LOCK_EXT) {
         return await defaultReader(lockPath)
       }
-      if (ext === '.lockb') {
+      if (ext === BINARY_LOCK_EXT) {
         const lockBuffer = await binaryReader(lockPath)
         if (lockBuffer) {
           try {
@@ -107,6 +117,7 @@ const readLockFileByAgent: Record<Agent, ReadLockFile> = (() => {
         // https://bun.sh/guides/install/yarnlock
         return (await spawn(agentExecPath, [lockPath])).stdout.trim()
       }
+      return undefined
     }),
     [NPM]: defaultReader,
     [PNPM]: defaultReader,