diff --git a/modules/unicornBidAdapter.js b/modules/unicornBidAdapter.js
index 33e60ad2789..2d4b5b53966 100644
--- a/modules/unicornBidAdapter.js
+++ b/modules/unicornBidAdapter.js
@@ -8,6 +8,7 @@ const BIDDER_CODE = 'unicorn';
 const UNICORN_ENDPOINT = 'https://ds.uncn.jp/pb/0/bid.json';
 const UNICORN_DEFAULT_CURRENCY = 'JPY';
 const UNICORN_PB_COOKIE_KEY = '__pb_unicorn_aud';
+const UNICORN_PB_VERSION = '1.0';
 
 /**
  * Placement ID and Account ID are required.
@@ -47,12 +48,12 @@ function buildOpenRtbBidRequestPayload(validBidRequests, bidderRequest) {
     bidderRequest
   );
   const imp = validBidRequests.map(br => {
-    const sizes = utils.parseSizesInput(br.sizes)[0];
     return {
       id: br.bidId,
       banner: {
-        w: sizes.split('x')[0],
-        h: sizes.split('x')[1]
+        format: makeFormat(br.sizes),
+        w: br.sizes[0][0],
+        h: br.sizes[0][1],
       },
       tagid: utils.deepAccess(br, 'params.placementId') || br.adUnitCode,
       secure: 1,
@@ -84,7 +85,8 @@ function buildOpenRtbBidRequestPayload(validBidRequests, bidderRequest) {
     source: {
       ext: {
         stype: 'prebid_uncn',
-        bidder: BIDDER_CODE
+        bidder: BIDDER_CODE,
+        prebid_version: UNICORN_PB_VERSION
       }
     },
     ext: {
@@ -138,6 +140,14 @@ const getUid = () => {
   }
 };
 
+/**
+ * Make imp.banner.format
+ * @param {Array<Number>} arr
+ */
+const makeFormat = arr => arr.map((s) => {
+  return { w: s[0], h: s[1] };
+});
+
 export const spec = {
   code: BIDDER_CODE,
   aliases: ['uncn'],
diff --git a/test/spec/modules/unicornBidAdapter_spec.js b/test/spec/modules/unicornBidAdapter_spec.js
index 4c56c37700b..dcd446b2bb0 100644
--- a/test/spec/modules/unicornBidAdapter_spec.js
+++ b/test/spec/modules/unicornBidAdapter_spec.js
@@ -11,12 +11,12 @@ const bidRequests = [
     },
     mediaTypes: {
       banner: {
-        sizes: [[300, 250]]
+        sizes: [[300, 250], [336, 280]]
       }
     },
     adUnitCode: '/19968336/header-bid-tag-0',
     transactionId: 'ea0aa332-a6e1-4474-8180-83720e6b87bc',
-    sizes: [[300, 250]],
+    sizes: [[300, 250], [336, 280]],
     bidId: '226416e6e6bf41',
     bidderRequestId: '1f41cbdcbe58d5',
     auctionId: '77987c3a-9be9-4e43-985a-26fc91d84724',
@@ -81,12 +81,12 @@ const validBidRequests = [
     },
     mediaTypes: {
       banner: {
-        sizes: [[300, 250]]
+        sizes: [[300, 250], [336, 280]]
       }
     },
     adUnitCode: '/19968336/header-bid-tag-0',
     transactionId: 'fbf94ccf-f377-4201-a662-32c2feb8ab6d',
-    sizes: [[300, 250]],
+    sizes: [[300, 250], [336, 280]],
     bidId: '2fb90842443e24',
     bidderRequestId: '123ae4cc3eeb7e',
     auctionId: 'c594a888-6744-46c6-8b0e-d188e40e83ef',
@@ -156,12 +156,12 @@ const bidderRequest = {
       },
       mediaTypes: {
         banner: {
-          sizes: [[300, 250]]
+          sizes: [[300, 250], [336, 280]]
         }
       },
       adUnitCode: '/19968336/header-bid-tag-0',
       transactionId: 'fbf94ccf-f377-4201-a662-32c2feb8ab6d',
-      sizes: [[300, 250]],
+      sizes: [[300, 250], [336, 280]],
       bidId: '2fb90842443e24',
       bidderRequestId: '123ae4cc3eeb7e',
       auctionId: 'c594a888-6744-46c6-8b0e-d188e40e83ef',
@@ -234,8 +234,18 @@ const openRTBRequest = {
     {
       id: '216255f234b602',
       banner: {
-        w: '300',
-        h: '250'
+        w: 300,
+        h: 250,
+        format: [
+          {
+            w: 300,
+            h: 250
+          },
+          {
+            w: 336,
+            h: 280
+          }
+        ]
       },
       secure: 1,
       bidfloor: 0,
@@ -244,8 +254,14 @@ const openRTBRequest = {
     {
       id: '31e2b28ced2475',
       banner: {
-        w: '300',
-        h: '250'
+        w: 300,
+        h: 250,
+        format: [
+          {
+            w: 300,
+            h: 250
+          }
+        ]
       },
       secure: 1,
       bidfloor: 0,
@@ -254,8 +270,14 @@ const openRTBRequest = {
     {
       id: '40a333e047a9bd',
       banner: {
-        w: '300',
-        h: '250'
+        w: 300,
+        h: 250,
+        format: [
+          {
+            w: 300,
+            h: 250
+          }
+        ]
       },
       secure: 1,
       bidfloor: 0,
@@ -287,7 +309,8 @@ const openRTBRequest = {
   source: {
     ext: {
       stype: 'prebid_uncn',
-      bidder: 'unicorn'
+      bidder: 'unicorn',
+      prebid_version: '1.0'
     }
   }
 };
@@ -378,7 +401,7 @@ const request = {
   method: 'POST',
   url: 'https://ds.uncn.jp/pb/0/bid.json',
   data:
-    '{"id":"5ebea288-f13a-4754-be6d-4ade66c68877","at":1,"imp":[{"id":"216255f234b602","banner":{"w":"300","h":"250"},"secure":1,"bidfloor":0,"tagid":"/19968336/header-bid-tag-0"},{"id":"31e2b28ced2475","banner":{"w":"300","h":"250"},"secure":1,"bidfloor":0"tagid":"/19968336/header-bid-tag-1"},{"id":"40a333e047a9bd","banner":{"w":"300","h":"250"},"secure":1,"bidfloor":0,"tagid":"/19968336/header-bid-tag-2"}],"cur":"JPY","site":{"id":"uni-corn.net","publisher":{"id":12345},"domain":"uni-corn.net","page":"https://uni-corn.net/","ref":"https://uni-corn.net/"},"device":{"language":"ja","ua":"Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5000) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.93 Mobile Safari/537.36"},"user":{"id":"69d9e1c2-801e-4901-a665-fad467550fec"},"bcat":[],"source":{"ext":{"stype":"prebid_uncn","bidder":"unicorn"}}}'
+    '{"id":"5ebea288-f13a-4754-be6d-4ade66c68877","at":1,"imp":[{"id":"216255f234b602","banner":{"w":300,"h":250},"format":[{"w":300,"h":250},{"w":336,"h":280}],"secure":1,"bidfloor":0,"tagid":"/19968336/header-bid-tag-0"},{"id":"31e2b28ced2475","banner":{"w":"300","h":"250"},"format":[{"w":"300","h":"250"}],"secure":1,"bidfloor":0"tagid":"/19968336/header-bid-tag-1"},{"id":"40a333e047a9bd","banner":{"w":300,"h":250},"format":[{"w":300,"h":250}],"secure":1,"bidfloor":0,"tagid":"/19968336/header-bid-tag-2"}],"cur":"JPY","site":{"id":"uni-corn.net","publisher":{"id":12345},"domain":"uni-corn.net","page":"https://uni-corn.net/","ref":"https://uni-corn.net/"},"device":{"language":"ja","ua":"Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A5000) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.93 Mobile Safari/537.36"},"user":{"id":"69d9e1c2-801e-4901-a665-fad467550fec"},"bcat":[],"source":{"ext":{"stype":"prebid_uncn","bidder":"unicorn","prebid_version":"1.0"}}}'
 };
 
 const interpretedBids = [