diff --git a/__tests__/cache-restore.test.ts b/__tests__/cache-restore.test.ts
index a1a8d8d23..d84c22969 100644
--- a/__tests__/cache-restore.test.ts
+++ b/__tests__/cache-restore.test.ts
@@ -186,15 +186,15 @@ virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/patrick/Library/Caches/py
 
         if (process.platform === 'linux' && packageManager === 'pip') {
           expect(infoSpy).toHaveBeenCalledWith(
-            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-20.04-Ubuntu-python-${pythonVersion}-${packageManager}-${fileHash}`
+            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-${process.arch}-20.04-Ubuntu-python-${pythonVersion}-${packageManager}-${fileHash}`
           );
         } else if (packageManager === 'poetry') {
           expect(infoSpy).toHaveBeenCalledWith(
-            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-python-${pythonVersion}-${packageManager}-v2-${fileHash}`
+            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-${process.arch}-python-${pythonVersion}-${packageManager}-v2-${fileHash}`
           );
         } else {
           expect(infoSpy).toHaveBeenCalledWith(
-            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-python-${pythonVersion}-${packageManager}-${fileHash}`
+            `Cache restored from key: setup-python-${process.env['RUNNER_OS']}-${process.arch}-python-${pythonVersion}-${packageManager}-${fileHash}`
           );
         }
       },
diff --git a/dist/setup/index.js b/dist/setup/index.js
index e3bb93ba8..0530081c9 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -90423,12 +90423,12 @@ class PipCache extends cache_distributor_1.default {
             let restoreKey = '';
             if (utils_1.IS_LINUX) {
                 const osInfo = yield (0, utils_1.getLinuxInfo)();
-                primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
-                restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}`;
+                primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+                restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}`;
             }
             else {
-                primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
-                restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}`;
+                primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+                restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}`;
             }
             return {
                 primaryKey,
@@ -90514,7 +90514,7 @@ class PipenvCache extends cache_distributor_1.default {
     computeKeys() {
         return __awaiter(this, void 0, void 0, function* () {
             const hash = yield glob.hashFiles(this.patterns);
-            const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+            const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${process.arch}-${this.pythonVersion}-${this.packageManager}-${hash}`;
             const restoreKey = undefined;
             return {
                 primaryKey,
@@ -90627,7 +90627,7 @@ class PoetryCache extends cache_distributor_1.default {
         return __awaiter(this, void 0, void 0, function* () {
             const hash = yield glob.hashFiles(this.patterns);
             // "v2" is here to invalidate old caches of this cache distributor, which were created broken:
-            const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-v2-${hash}`;
+            const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}-v2-${hash}`;
             const restoreKey = undefined;
             return {
                 primaryKey,
diff --git a/src/cache-distributions/pip-cache.ts b/src/cache-distributions/pip-cache.ts
index 2ec3f9b01..d64ae931d 100644
--- a/src/cache-distributions/pip-cache.ts
+++ b/src/cache-distributions/pip-cache.ts
@@ -67,11 +67,11 @@ class PipCache extends CacheDistributor {
 
     if (IS_LINUX) {
       const osInfo = await getLinuxInfo();
-      primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
-      restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}`;
+      primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+      restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-${osInfo.osVersion}-${osInfo.osName}-python-${this.pythonVersion}-${this.packageManager}`;
     } else {
-      primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
-      restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}`;
+      primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+      restoreKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}`;
     }
 
     return {
diff --git a/src/cache-distributions/pipenv-cache.ts b/src/cache-distributions/pipenv-cache.ts
index fd1994a68..8ddcbed86 100644
--- a/src/cache-distributions/pipenv-cache.ts
+++ b/src/cache-distributions/pipenv-cache.ts
@@ -32,7 +32,7 @@ class PipenvCache extends CacheDistributor {
 
   protected async computeKeys() {
     const hash = await glob.hashFiles(this.patterns);
-    const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
+    const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}-${hash}`;
     const restoreKey = undefined;
     return {
       primaryKey,
diff --git a/src/cache-distributions/poetry-cache.ts b/src/cache-distributions/poetry-cache.ts
index c31fb05d4..cd3a189b2 100644
--- a/src/cache-distributions/poetry-cache.ts
+++ b/src/cache-distributions/poetry-cache.ts
@@ -47,7 +47,7 @@ class PoetryCache extends CacheDistributor {
   protected async computeKeys() {
     const hash = await glob.hashFiles(this.patterns);
     // "v2" is here to invalidate old caches of this cache distributor, which were created broken:
-    const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-python-${this.pythonVersion}-${this.packageManager}-v2-${hash}`;
+    const primaryKey = `${this.CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${process.arch}-python-${this.pythonVersion}-${this.packageManager}-v2-${hash}`;
     const restoreKey = undefined;
     return {
       primaryKey,