diff --git a/__tests__/distributors/zulu-linux-installer.test.ts b/__tests__/distributors/zulu-linux-installer.test.ts
index 0e956f20..23362704 100644
--- a/__tests__/distributors/zulu-linux-installer.test.ts
+++ b/__tests__/distributors/zulu-linux-installer.test.ts
@@ -58,7 +58,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk',
         checkLatest: false
       },
-      '?os=linux-glibc&arch=x86&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=linux-glibc&arch=x64&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -67,7 +67,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jre',
         checkLatest: false
       },
-      '?os=linux-glibc&arch=x86&archive_type=zip&java_package_type=jre&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=linux-glibc&arch=x64&archive_type=zip&java_package_type=jre&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -76,7 +76,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk+fx',
         checkLatest: false
       },
-      '?os=linux-glibc&arch=x86&archive_type=zip&java_package_type=jdk&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=linux-glibc&arch=x64&archive_type=zip&java_package_type=jdk&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -85,7 +85,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jre+fx',
         checkLatest: false
       },
-      '?os=linux-glibc&arch=x86&archive_type=zip&java_package_type=jre&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=linux-glibc&arch=x64&archive_type=zip&java_package_type=jre&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -94,7 +94,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk',
         checkLatest: false
       },
-      '?os=linux-glibc&arch=arm&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=linux-glibc&arch=arm64&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -139,7 +139,8 @@ describe('getAvailableVersions', () => {
       distribution['getPlatformOption'] = () => 'linux';
       // Override extension for linux default arch case to match util behavior
       spyUtilGetDownloadArchiveExtension.mockReturnValue('tar.gz');
-      const buildUrl = `https://api.azul.com/metadata/v1/zulu/packages/?os=linux-glibc&arch=${distroArch.arch}&archive_type=tar.gz&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100`;
+      const expectedArch = distroArch.bitness === '64' && distroArch.arch === 'x86' ? 'x64' : distroArch.bitness === '64' && distroArch.arch === 'arm' ? 'arm64' : distroArch.arch;
+      const buildUrl = `https://api.azul.com/metadata/v1/zulu/packages/?os=linux-glibc&arch=${expectedArch}&archive_type=tar.gz&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100`;
 
       await distribution['getAvailableVersions']();
 
diff --git a/__tests__/distributors/zulu-windows-installer.test.ts b/__tests__/distributors/zulu-windows-installer.test.ts
index 6a3c66d5..2d51d963 100644
--- a/__tests__/distributors/zulu-windows-installer.test.ts
+++ b/__tests__/distributors/zulu-windows-installer.test.ts
@@ -58,7 +58,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk',
         checkLatest: false
       },
-      '?os=windows&arch=x86&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=windows&arch=x64&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -67,7 +67,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jre',
         checkLatest: false
       },
-      '?os=windows&arch=x86&archive_type=zip&java_package_type=jre&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=windows&arch=x64&archive_type=zip&java_package_type=jre&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -76,7 +76,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk+fx',
         checkLatest: false
       },
-      '?os=windows&arch=x86&archive_type=zip&java_package_type=jdk&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=windows&arch=x64&archive_type=zip&java_package_type=jdk&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -85,7 +85,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jre+fx',
         checkLatest: false
       },
-      '?os=windows&arch=x86&archive_type=zip&java_package_type=jre&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=windows&arch=x64&archive_type=zip&java_package_type=jre&javafx_bundled=true&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -94,7 +94,7 @@ describe('getAvailableVersions', () => {
         packageType: 'jdk',
         checkLatest: false
       },
-      '?os=windows&arch=arm&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
+      '?os=windows&arch=arm64&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100'
     ],
     [
       {
@@ -137,7 +137,8 @@ describe('getAvailableVersions', () => {
         checkLatest: false
       });
       distribution['getPlatformOption'] = () => 'windows';
-      const buildUrl = `https://api.azul.com/metadata/v1/zulu/packages/?os=windows&arch=${distroArch.arch}&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100`;
+      const expectedArch = distroArch.bitness === '64' && distroArch.arch === 'x86' ? 'x64' : distroArch.bitness === '64' && distroArch.arch === 'arm' ? 'arm64' : distroArch.arch;
+      const buildUrl = `https://api.azul.com/metadata/v1/zulu/packages/?os=windows&arch=${expectedArch}&archive_type=zip&java_package_type=jdk&javafx_bundled=false&crac_supported=false&release_status=ga&availability_types=ca&certifications=tck&page=1&page_size=100`;
 
       await distribution['getAvailableVersions']();
 
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 92b98856..b088fd1e 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -114789,33 +114789,45 @@ class ZuluDistribution extends base_installer_1.JavaBase {
             // Map old API parameters to new metadata API parameters
             const osParam = this.getOsParam(platform);
             const archiveType = this.getArchiveType(extension);
-            const requestArguments = [
-                `os=${osParam}`,
-                `arch=${arch}`,
-                `archive_type=${archiveType}`,
-                `java_package_type=${bundleType}`,
-                `javafx_bundled=${javafx}`,
-                `crac_supported=${crac}`,
-                `release_status=${releaseStatus}`,
-                `availability_types=ca`,
-                `certifications=tck`,
-                `page=1`,
-                `page_size=100`
-            ]
-                .filter(Boolean)
-                .join('&');
-            const availableVersionsUrl = `https://api.azul.com/metadata/v1/zulu/packages/?${requestArguments}`;
-            core.debug(`Gathering available versions from '${availableVersionsUrl}'`);
-            const availableVersions = (_c = (yield this.http.getJson(availableVersionsUrl))
-                .result) !== null && _c !== void 0 ? _c : [];
+            const archParam = this.getArchParam(arch, hw_bitness);
+            // Fetch all pages to avoid missing packages when there are > 100 results
+            let allVersions = [];
+            let page = 1;
+            const pageSize = 100;
+            let hasMore = true;
+            while (hasMore) {
+                const requestArguments = [
+                    `os=${osParam}`,
+                    `arch=${archParam}`,
+                    `archive_type=${archiveType}`,
+                    `java_package_type=${bundleType}`,
+                    `javafx_bundled=${javafx}`,
+                    `crac_supported=${crac}`,
+                    `release_status=${releaseStatus}`,
+                    `availability_types=ca`,
+                    `certifications=tck`,
+                    `page=${page}`,
+                    `page_size=${pageSize}`
+                ]
+                    .filter(Boolean)
+                    .join('&');
+                const availableVersionsUrl = `https://api.azul.com/metadata/v1/zulu/packages/?${requestArguments}`;
+                core.debug(`Gathering available versions from '${availableVersionsUrl}'`);
+                const pageResults = (_c = (yield this.http.getJson(availableVersionsUrl))
+                    .result) !== null && _c !== void 0 ? _c : [];
+                allVersions = allVersions.concat(pageResults);
+                // If we got fewer results than page size, we've reached the end
+                hasMore = pageResults.length === pageSize;
+                page++;
+            }
             if (core.isDebug()) {
                 core.startGroup('Print information about available versions');
                 console.timeEnd('Retrieving available versions for Zulu took'); // eslint-disable-line no-console
-                core.debug(`Available versions: [${availableVersions.length}]`);
-                core.debug(availableVersions.map(item => item.java_version.join('.')).join(', '));
+                core.debug(`Available versions: [${allVersions.length}]`);
+                core.debug(allVersions.map(item => item.java_version.join('.')).join(', '));
                 core.endGroup();
             }
-            return availableVersions;
+            return allVersions;
         });
     }
     getArchitectureOptions() {
@@ -114857,6 +114869,24 @@ class ZuluDistribution extends base_installer_1.JavaBase {
                 return platform;
         }
     }
+    getArchParam(arch, hw_bitness) {
+        // Map architecture to new metadata API arch parameter
+        // The new API uses x64, x86, arm64, arm (not the legacy x86 + hw_bitness pattern)
+        if (arch === 'x86' && hw_bitness === '64') {
+            return 'x64';
+        }
+        else if (arch === 'x86' && hw_bitness === '32') {
+            return 'x86';
+        }
+        else if (arch === 'arm' && hw_bitness === '64') {
+            return 'arm64';
+        }
+        else if (arch === 'arm' && hw_bitness === '') {
+            return 'arm';
+        }
+        // Fallback for other architectures
+        return arch;
+    }
     getArchiveType(extension) {
         // Map extension to archive_type parameter for new API
         switch (extension) {
diff --git a/src/distributions/zulu/installer.ts b/src/distributions/zulu/installer.ts
index 22781079..67384549 100644
--- a/src/distributions/zulu/installer.ts
+++ b/src/distributions/zulu/installer.ts
@@ -115,42 +115,57 @@ export class ZuluDistribution extends JavaBase {
     // Map old API parameters to new metadata API parameters
     const osParam = this.getOsParam(platform);
     const archiveType = this.getArchiveType(extension);
+    const archParam = this.getArchParam(arch, hw_bitness);
 
-    const requestArguments = [
-      `os=${osParam}`,
-      `arch=${arch}`,
-      `archive_type=${archiveType}`,
-      `java_package_type=${bundleType}`,
-      `javafx_bundled=${javafx}`,
-      `crac_supported=${crac}`,
-      `release_status=${releaseStatus}`,
-      `availability_types=ca`,
-      `certifications=tck`,
-      `page=1`,
-      `page_size=100`
-    ]
-      .filter(Boolean)
-      .join('&');
+    // Fetch all pages to avoid missing packages when there are > 100 results
+    let allVersions: IZuluVersions[] = [];
+    let page = 1;
+    const pageSize = 100;
+    let hasMore = true;
 
-    const availableVersionsUrl = `https://api.azul.com/metadata/v1/zulu/packages/?${requestArguments}`;
+    while (hasMore) {
+      const requestArguments = [
+        `os=${osParam}`,
+        `arch=${archParam}`,
+        `archive_type=${archiveType}`,
+        `java_package_type=${bundleType}`,
+        `javafx_bundled=${javafx}`,
+        `crac_supported=${crac}`,
+        `release_status=${releaseStatus}`,
+        `availability_types=ca`,
+        `certifications=tck`,
+        `page=${page}`,
+        `page_size=${pageSize}`
+      ]
+        .filter(Boolean)
+        .join('&');
 
-    core.debug(`Gathering available versions from '${availableVersionsUrl}'`);
+      const availableVersionsUrl = `https://api.azul.com/metadata/v1/zulu/packages/?${requestArguments}`;
 
-    const availableVersions =
-      (await this.http.getJson<Array<IZuluVersions>>(availableVersionsUrl))
-        .result ?? [];
+      core.debug(`Gathering available versions from '${availableVersionsUrl}'`);
+
+      const pageResults =
+        (await this.http.getJson<Array<IZuluVersions>>(availableVersionsUrl))
+          .result ?? [];
+
+      allVersions = allVersions.concat(pageResults);
+
+      // If we got fewer results than page size, we've reached the end
+      hasMore = pageResults.length === pageSize;
+      page++;
+    }
 
     if (core.isDebug()) {
       core.startGroup('Print information about available versions');
       console.timeEnd('Retrieving available versions for Zulu took'); // eslint-disable-line no-console
-      core.debug(`Available versions: [${availableVersions.length}]`);
+      core.debug(`Available versions: [${allVersions.length}]`);
       core.debug(
-        availableVersions.map(item => item.java_version.join('.')).join(', ')
+        allVersions.map(item => item.java_version.join('.')).join(', ')
       );
       core.endGroup();
     }
 
-    return availableVersions;
+    return allVersions;
   }
 
   private getArchitectureOptions(): {
@@ -199,6 +214,22 @@ export class ZuluDistribution extends JavaBase {
     }
   }
 
+  private getArchParam(arch: string, hw_bitness: string): string {
+    // Map architecture to new metadata API arch parameter
+    // The new API uses x64, x86, arm64, arm (not the legacy x86 + hw_bitness pattern)
+    if (arch === 'x86' && hw_bitness === '64') {
+      return 'x64';
+    } else if (arch === 'x86' && hw_bitness === '32') {
+      return 'x86';
+    } else if (arch === 'arm' && hw_bitness === '64') {
+      return 'arm64';
+    } else if (arch === 'arm' && hw_bitness === '') {
+      return 'arm';
+    }
+    // Fallback for other architectures
+    return arch;
+  }
+
   private getArchiveType(extension: string): string {
     // Map extension to archive_type parameter for new API
     switch (extension) {