diff --git a/build/main.js b/build/main.js
index a5d3f36..c94966d 100644
--- a/build/main.js
+++ b/build/main.js
@@ -24375,6 +24375,25 @@ function processDependencies(rootInfo, root, packageMap, prefix) {
   }
 }
 
+// node_modules/lockparse/lib/traverse.js
+var visitorKeys = [
+  ["dependency", "dependencies"],
+  ["devDependency", "devDependencies"],
+  ["peerDependency", "peerDependencies"],
+  ["optionalDependency", "optionalDependencies"]
+];
+function traverse(node, visitor) {
+  for (const [visitorKey, nodeKey] of visitorKeys) {
+    if (visitor[visitorKey]) {
+      for (const dep of node[nodeKey]) {
+        if (visitor[visitorKey](dep, node) !== false) {
+          traverse(dep, visitor);
+        }
+      }
+    }
+  }
+}
+
 // node_modules/lockparse/lib/main.js
 var typeMap = {
   "package-lock.json": "npm",
@@ -24611,6 +24630,12 @@ function getDependenciesFromPackageJson(pkg, types) {
   }
   return result;
 }
+function isSupportedArchitecture(pkg, os, cpu, libc) {
+  const osMatches = pkg.os === void 0 || pkg.os.length === 0 || pkg.os.includes(os);
+  const cpuMatches = pkg.cpu === void 0 || pkg.cpu.length === 0 || pkg.cpu.includes(cpu);
+  const libcMatches = pkg.libc === void 0 || pkg.libc.length === 0 || pkg.libc.includes(libc);
+  return osMatches && cpuMatches && libcMatches;
+}
 
 // src/packs.ts
 var core3 = __toESM(require_core(), 1);
@@ -24878,7 +24903,7 @@ function formatBytes(bytes) {
 }
 
 // src/checks/dependency-size.ts
-async function scanForDependencySize(messages, threshold, currentDeps, baseDeps) {
+async function scanForDependencySize(messages, threshold, currentDeps, baseDeps, currentLockFile) {
   const newVersions = [];
   const removedVersions = [];
   for (const [packageName, currentVersionSet] of currentDeps) {
@@ -24904,6 +24929,31 @@ async function scanForDependencySize(messages, threshold, currentDeps, baseDeps)
       }
     }
   }
+  if (newVersions.length > 0) {
+    const allOptionalVersions = /* @__PURE__ */ new Map();
+    for (const pkg of currentLockFile.packages) {
+      traverse(pkg, {
+        optionalDependency: (node) => {
+          const entry = allOptionalVersions.get(node.name) ?? /* @__PURE__ */ new Set();
+          entry.add(node.version);
+          allOptionalVersions.set(node.name, entry);
+        }
+      });
+    }
+    for (const [pkg, versions] of allOptionalVersions) {
+      for (const version of versions) {
+        const pkgMeta = await fetchPackageMetadata(pkg, version);
+        if (pkgMeta && !isSupportedArchitecture(pkgMeta, "linux", "x64", "glibc")) {
+          const entry = newVersions.findIndex(
+            (v) => v.name === pkg && v.version === version
+          );
+          if (entry !== -1) {
+            newVersions.splice(entry, 1);
+          }
+        }
+      }
+    }
+  }
   core5.info(`Found ${newVersions.length} new package versions`);
   core5.info(`Found ${removedVersions.length} removed package versions.`);
   if (newVersions.length === 0 && removedVersions.length === 0) {
@@ -25113,7 +25163,13 @@ async function run() {
       baseDeps
     );
     scanForDuplicates(messages, duplicateThreshold, currentDeps, lockfilePath);
-    await scanForDependencySize(messages, sizeThreshold, currentDeps, baseDeps);
+    await scanForDependencySize(
+      messages,
+      sizeThreshold,
+      currentDeps,
+      baseDeps,
+      parsedCurrentLock
+    );
     await scanForProvenance(messages, currentDeps, baseDeps);
     const basePackagesPattern = core7.getInput("base-packages");
     const sourcePackagesPattern = core7.getInput("source-packages");
diff --git a/src/checks/dependency-size.ts b/src/checks/dependency-size.ts
index e1811c8..9f3cad9 100644
--- a/src/checks/dependency-size.ts
+++ b/src/checks/dependency-size.ts
@@ -1,12 +1,18 @@
 import * as core from '@actions/core';
-import {calculateTotalDependencySizeIncrease} from '../npm.js';
+import {type ParsedLockFile, traverse} from 'lockparse';
+import {
+  calculateTotalDependencySizeIncrease,
+  fetchPackageMetadata,
+  isSupportedArchitecture
+} from '../npm.js';
 import {formatBytes} from '../common.js';
 
 export async function scanForDependencySize(
   messages: string[],
   threshold: number,
   currentDeps: Map<string, Set<string>>,
-  baseDeps: Map<string, Set<string>>
+  baseDeps: Map<string, Set<string>>,
+  currentLockFile: ParsedLockFile
 ): Promise<void> {
   const newVersions: Array<{
     name: string;
@@ -45,6 +51,37 @@ export async function scanForDependencySize(
     }
   }
 
+  if (newVersions.length > 0) {
+    const allOptionalVersions = new Map<string, Set<string>>();
+
+    for (const pkg of currentLockFile.packages) {
+      traverse(pkg, {
+        optionalDependency: (node) => {
+          const entry = allOptionalVersions.get(node.name) ?? new Set<string>();
+          entry.add(node.version);
+          allOptionalVersions.set(node.name, entry);
+        }
+      });
+    }
+
+    for (const [pkg, versions] of allOptionalVersions) {
+      for (const version of versions) {
+        const pkgMeta = await fetchPackageMetadata(pkg, version);
+        if (
+          pkgMeta &&
+          !isSupportedArchitecture(pkgMeta, 'linux', 'x64', 'glibc')
+        ) {
+          const entry = newVersions.findIndex(
+            (v) => v.name === pkg && v.version === version
+          );
+          if (entry !== -1) {
+            newVersions.splice(entry, 1);
+          }
+        }
+      }
+    }
+  }
+
   core.info(`Found ${newVersions.length} new package versions`);
   core.info(`Found ${removedVersions.length} removed package versions.`);
 
diff --git a/src/main.ts b/src/main.ts
index fcf308d..07485ed 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -130,7 +130,13 @@ async function run(): Promise<void> {
     );
     scanForDuplicates(messages, duplicateThreshold, currentDeps, lockfilePath);
 
-    await scanForDependencySize(messages, sizeThreshold, currentDeps, baseDeps);
+    await scanForDependencySize(
+      messages,
+      sizeThreshold,
+      currentDeps,
+      baseDeps,
+      parsedCurrentLock
+    );
     await scanForProvenance(messages, currentDeps, baseDeps);
 
     const basePackagesPattern = core.getInput('base-packages');
diff --git a/src/npm.ts b/src/npm.ts
index 0fdd85a..068cba6 100644
--- a/src/npm.ts
+++ b/src/npm.ts
@@ -4,6 +4,9 @@ import type {PackageJson} from 'pkg-types';
 export interface PackageMetadata {
   name: string;
   version: string;
+  os?: string[];
+  cpu?: string[];
+  libc?: string[];
   dist?: {
     unpackedSize?: number;
     attestations?: {
@@ -218,3 +221,18 @@ export function getDependenciesFromPackageJson(
 
   return result;
 }
+
+export function isSupportedArchitecture(
+  pkg: PackageJson,
+  os: string,
+  cpu: string,
+  libc: string
+): boolean {
+  const osMatches =
+    pkg.os === undefined || pkg.os.length === 0 || pkg.os.includes(os);
+  const cpuMatches =
+    pkg.cpu === undefined || pkg.cpu.length === 0 || pkg.cpu.includes(cpu);
+  const libcMatches =
+    pkg.libc === undefined || pkg.libc.length === 0 || pkg.libc.includes(libc);
+  return osMatches && cpuMatches && libcMatches;
+}
diff --git a/test/npm_test.ts b/test/npm_test.ts
index e1678dc..ee41dd3 100644
--- a/test/npm_test.ts
+++ b/test/npm_test.ts
@@ -1,4 +1,5 @@
 import * as core from '@actions/core';
+import type {PackageJson} from 'pkg-types';
 import {
   describe,
   it,
@@ -14,6 +15,7 @@ import {
   getProvenance,
   getTrustLevel,
   getProvenanceForPackageVersions,
+  isSupportedArchitecture,
   getMinTrustLevel,
   getDependenciesFromPackageJson,
   type ProvenanceStatus,
@@ -294,3 +296,94 @@ describe('getDependenciesFromPackageJson', () => {
     );
   });
 });
+
+describe('isSupportedArchitecture', () => {
+  it('returns true if no os, cpu, or libc fields are present', () => {
+    const pkg: PackageJson = {
+      name: 'some-package'
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+  });
+
+  it('returns true if os matches, cpu/libc empty', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      os: ['linux', 'darwin']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'darwin', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'win32', 'x64', 'glibc')).toBe(false);
+  });
+
+  it('returns true if cpu matches, os/libc empty', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      cpu: ['x64', 'arm64']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'arm64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'ia32', 'glibc')).toBe(false);
+  });
+
+  it('returns true if libc matches, os/cpu empty', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      libc: ['glibc', 'musl']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'musl')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'uclibc')).toBe(false);
+  });
+
+  it('returns true if all match', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      os: ['linux', 'darwin'],
+      cpu: ['x64', 'arm64'],
+      libc: ['glibc', 'musl']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'darwin', 'arm64', 'musl')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'ia32', 'glibc')).toBe(false);
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'uclibc')).toBe(false);
+    expect(isSupportedArchitecture(pkg, 'win32', 'x64', 'glibc')).toBe(false);
+  });
+
+  it('returns true if os is empty array', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      os: [],
+      cpu: ['x64'],
+      libc: ['glibc']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'darwin', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'win32', 'x64', 'glibc')).toBe(true);
+  });
+
+  it('returns true if cpu is empty array', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      os: ['linux'],
+      cpu: [],
+      libc: ['glibc']
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'arm64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'ia32', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'darwin', 'x64', 'glibc')).toBe(false);
+  });
+
+  it('returns true if libc is empty array', () => {
+    const pkg: PackageJson = {
+      name: 'some-package',
+      os: ['linux'],
+      cpu: ['x64'],
+      libc: []
+    };
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'glibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'musl')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'linux', 'x64', 'uclibc')).toBe(true);
+    expect(isSupportedArchitecture(pkg, 'darwin', 'x64', 'glibc')).toBe(false);
+  });
+});