diff --git a/mirage/serializers/crate.js b/mirage/serializers/crate.js
index 9ad52c25a70..12a38b32918 100644
--- a/mirage/serializers/crate.js
+++ b/mirage/serializers/crate.js
@@ -53,10 +53,18 @@ export default BaseSerializer.extend({
   _adjust(hash) {
     let versions = this.schema.versions.where({ crateId: hash.id });
     assert(`crate \`${hash.name}\` has no associated versions`, versions.length !== 0);
-    versions = versions.filter(it => !it.yanked);
 
-    let versionNums = versions.models.map(it => it.num);
+    let versionsByNum = Object.fromEntries(versions.models.map(it => [it.num, it]));
+    let versionNums = Object.keys(versionsByNum);
     semverSort(versionNums, { loose: true });
+    hash.default_version =
+      versionNums.find(it => !prerelease(it, { loose: true }) && !versionsByNum[it].yanked) ??
+      versionNums.find(it => !versionsByNum[it].yanked) ??
+      versionNums[0];
+    hash.yanked = versionsByNum[hash.default_version]?.yanked ?? false;
+
+    versions = versions.filter(it => !it.yanked);
+    versionNums = versionNums.filter(it => !versionsByNum[it].yanked);
     hash.max_version = versionNums[0] ?? '0.0.0';
     hash.max_stable_version = versionNums.find(it => !prerelease(it, { loose: true })) ?? null;
 
diff --git a/tests/mirage/crates/get-by-id-test.js b/tests/mirage/crates/get-by-id-test.js
index 5bd96e413c1..d43075b07ff 100644
--- a/tests/mirage/crates/get-by-id-test.js
+++ b/tests/mirage/crates/get-by-id-test.js
@@ -27,6 +27,7 @@ module('Mirage | GET /api/v1/crates/:id', function (hooks) {
         badges: [],
         categories: [],
         created_at: '2010-06-16T21:30:45Z',
+        default_version: '1.0.0-beta.1',
         description: 'This is the description for the crate called "rand"',
         documentation: null,
         downloads: 0,
@@ -47,6 +48,7 @@ module('Mirage | GET /api/v1/crates/:id', function (hooks) {
         repository: null,
         updated_at: '2017-02-24T12:34:56Z',
         versions: ['1'],
+        yanked: false,
       },
       keywords: [],
       versions: [
diff --git a/tests/mirage/crates/list-test.js b/tests/mirage/crates/list-test.js
index 6c1e7ec7bde..23e4f630432 100644
--- a/tests/mirage/crates/list-test.js
+++ b/tests/mirage/crates/list-test.js
@@ -44,6 +44,7 @@ module('Mirage | GET /api/v1/crates', function (hooks) {
           badges: [],
           categories: [],
           created_at: '2010-06-16T21:30:45Z',
+          default_version: '1.0.0',
           description: 'This is the description for the crate called "rand"',
           documentation: null,
           downloads: 0,
@@ -63,6 +64,7 @@ module('Mirage | GET /api/v1/crates', function (hooks) {
           repository: null,
           updated_at: '2017-02-24T12:34:56Z',
           versions: ['1', '2'],
+          yanked: false,
         },
       ],
       meta: {
diff --git a/tests/mirage/summary-test.js b/tests/mirage/summary-test.js
index 5fb246a418f..5686aeb128d 100644
--- a/tests/mirage/summary-test.js
+++ b/tests/mirage/summary-test.js
@@ -42,6 +42,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       badges: [],
       categories: [],
       created_at: '2010-06-16T21:30:45Z',
+      default_version: '1.0.0',
       description: 'This is the description for the crate called "crate-0"',
       documentation: null,
       downloads: 0,
@@ -61,6 +62,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       repository: null,
       updated_at: '2017-02-24T12:34:56Z',
       versions: null,
+      yanked: false,
     });
 
     assert.strictEqual(responsePayload.most_downloaded.length, 10);
@@ -69,6 +71,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       badges: [],
       categories: [],
       created_at: '2010-06-16T21:30:45Z',
+      default_version: '1.0.4',
       description: 'This is the description for the crate called "crate-4"',
       documentation: null,
       downloads: 148_140,
@@ -88,6 +91,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       repository: null,
       updated_at: '2017-02-24T12:34:56Z',
       versions: null,
+      yanked: false,
     });
 
     assert.strictEqual(responsePayload.most_recently_downloaded.length, 10);
@@ -96,6 +100,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       badges: [],
       categories: [],
       created_at: '2010-06-16T21:30:45Z',
+      default_version: '1.0.0',
       description: 'This is the description for the crate called "crate-0"',
       documentation: null,
       downloads: 0,
@@ -115,6 +120,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       repository: null,
       updated_at: '2017-02-24T12:34:56Z',
       versions: null,
+      yanked: false,
     });
 
     assert.strictEqual(responsePayload.new_crates.length, 10);
@@ -123,6 +129,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       badges: [],
       categories: [],
       created_at: '2010-06-16T21:30:45Z',
+      default_version: '1.0.0',
       description: 'This is the description for the crate called "crate-0"',
       documentation: null,
       downloads: 0,
@@ -142,6 +149,7 @@ module('Mirage | GET /api/v1/summary', function (hooks) {
       repository: null,
       updated_at: '2017-02-24T12:34:56Z',
       versions: null,
+      yanked: false,
     });
 
     assert.strictEqual(responsePayload.num_crates, 20);