diff --git a/CHANGELOG.md b/CHANGELOG.md
index a39bcd1..8366e0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [3.1.22]
+- Added `saleInvoiceNumber` support to `PaymentRequest` and mapped `sale_invoice_number` parameter in `PensioMerchantAPI`.
+
 ## [3.1.21]
 - Added `riskManager` and `maxConversion` objects to `configuration` to /createCheckoutSession endpoint.
 
diff --git a/readme.md b/readme.md
index 715ebd6..b182a10 100644
--- a/readme.md
+++ b/readme.md
@@ -49,12 +49,12 @@ For integrating Java projects with the AltaPay gateway.
     <dependency>
         <groupId>com.altapay</groupId>
         <artifactId>sdk-java</artifactId>
-        <version>3.1.21</version>
+        <version>3.1.22</version>
     </dependency>
 
 ### Gradle
 
-    implementation 'com.altapay:sdk-java:3.1.21'
+    implementation 'com.altapay:sdk-java:3.1.22'
 
 ## Changelog