diff --git a/CHANGELOG b/CHANGELOG
index 0d61231..6ea0794 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,50 +1,57 @@
-0.1.14
+## 0.1.15
+
+fix: rank point change is not uploaded at first challenge ([#11](https://github.com/spacemeowx2/s3si.ts/issues/11))
+
+## 0.1.14
 
 fix: FEST upload failed
 
-0.1.13
+## 0.1.13
 
 feat: auto track after promotion challenge success
+
 fix: failed promotion challenge can also lead to tracked promotions
 
-0.1.12
+## 0.1.12
 
 feat: add rank tracker
 
-0.1.11
+## 0.1.11
 
 feat: use s3s' namespace. (see https://github.com/frozenpandaman/s3s/issues/65 for detail)
+
 refactor: remove `_bid` in exported file
 
-0.1.10
+## 0.1.10
 
 fix: missing draw judgement
 
-0.1.9
+## 0.1.9
 
 update WEB_VIEW_VERSION
 
-0.1.8
+## 0.1.8
 
 feat: add coop export
 
-0.1.7
+## 0.1.7
 
 feat: refetch token when 401 close #5
+
 feat: add github link to UA
 
-0.1.6
+## 0.1.6
 
 fix: wrong base64 encode/decode. (#4)
 
-0.1.5
+## 0.1.5
 
 fix: rank_up sent on last battle of challenge
 
-0.1.4
+## 0.1.4
 
 fix: wrong win/lose count in challenge
 
-0.1.3
+## 0.1.3
 
 feat: send challenge win/lose count every battle
diff --git a/src/constant.ts b/src/constant.ts
index 062e94f..76641a4 100644
--- a/src/constant.ts
+++ b/src/constant.ts
@@ -1,7 +1,7 @@
 import type { StatInkPostBody, VsHistoryDetail } from "./types.ts";
 
 export const AGENT_NAME = "s3si.ts";
-export const S3SI_VERSION = "0.1.14";
+export const S3SI_VERSION = "0.1.15";
 export const NSOAPP_VERSION = "2.3.1";
 export const WEB_VIEW_VERSION = "1.0.0-5644e7a2";
 export const S3SI_LINK = "https://github.com/spacemeowx2/s3si.ts";
diff --git a/src/exporters/stat.ink.ts b/src/exporters/stat.ink.ts
index f09a11b..bfa628a 100644
--- a/src/exporters/stat.ink.ts
+++ b/src/exporters/stat.ink.ts
@@ -287,12 +287,15 @@ export class StatInkExporter implements GameExporter {
       result.challenge_lose = challengeProgress.loseCount;
     }
 
-    if (rankBeforeState) {
+    if (rankBeforeState && rankState) {
       result.rank_before_exp = rankBeforeState.rankPoint;
-    }
-
-    if (rankState) {
       result.rank_after_exp = rankState.rankPoint;
+
+      // splatnet returns null, so we need to calculate it
+      if (result.rank_exp_change === null) {
+        result.rank_exp_change = result.rank_after_exp - result.rank_before_exp;
+      }
+
       if (!result.rank_after) {
         [result.rank_after, result.rank_after_s_plus] = parseUdemae(
           rankState.rank,