diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59f22ec..dac603e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.1.0] - 2026-04-16
+
+### Added
+
+- Add `organizations.updateDefaultSeries` to set an organization's default series by document type.
+
 ## [1.0.0] - 2026-04-07
 
 ### Added
diff --git a/README.es.md b/README.es.md
index 6b7456e..0e1dc20 100644
--- a/README.es.md
+++ b/README.es.md
@@ -29,14 +29,14 @@ Maven:
 <dependency>
   <groupId>io.facturapi</groupId>
   <artifactId>facturapi-java</artifactId>
-  <version>1.0.0</version>
+  <version>1.1.0</version>
 </dependency>
 ```
 
 Gradle:
 
 ```gradle
-implementation("io.facturapi:facturapi-java:1.0.0")
+implementation("io.facturapi:facturapi-java:1.1.0")
 ```
 
 ## Inicio rápido
diff --git a/README.md b/README.md
index 74e188d..fe0f67b 100644
--- a/README.md
+++ b/README.md
@@ -29,14 +29,14 @@ Maven:
 <dependency>
   <groupId>io.facturapi</groupId>
   <artifactId>facturapi-java</artifactId>
-  <version>1.0.0</version>
+  <version>1.1.0</version>
 </dependency>
 ```
 
 Gradle:
 
 ```gradle
-implementation("io.facturapi:facturapi-java:1.0.0")
+implementation("io.facturapi:facturapi-java:1.1.0")
 ```
 
 ## Quickstart
diff --git a/pom.xml b/pom.xml
index c0ae95b..6720b5a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
   <groupId>io.facturapi</groupId>
   <artifactId>facturapi-java</artifactId>
-  <version>1.0.0</version>
+  <version>1.1.0</version>
   <name>facturapi-java</name>
   <description>Official Java SDK for Facturapi</description>
   <url>https://github.com/facturapi/facturapi-java</url>
diff --git a/src/main/java/io/facturapi/resources/OrganizationsResource.java b/src/main/java/io/facturapi/resources/OrganizationsResource.java
index b2011d4..c5fb0de 100644
--- a/src/main/java/io/facturapi/resources/OrganizationsResource.java
+++ b/src/main/java/io/facturapi/resources/OrganizationsResource.java
@@ -201,6 +201,18 @@ public Series updateSeriesGroup(String organizationId, String seriesName, Map<St
     return put("/organizations/" + organizationId + "/series-group/" + seriesName, data, null, Series.class);
   }
 
+  /**
+   * Sets the default invoice series for a document type.
+   *
+   * @param organizationId Organization id.
+   * @param data Default series payload.
+   * @return Updated organization configuration.
+   * @see <a href="https://docs.facturapi.io/api#operation/updateDefaultSeries">API reference</a>
+   */
+  public Organization updateDefaultSeries(String organizationId, Map<String, Object> data) {
+    return put("/organizations/" + organizationId + "/series-group/default-series", data, null, Organization.class);
+  }
+
   /**
    * Deletes an invoice series.
    */
diff --git a/src/test/java/io/facturapi/FacturapiResourcesTest.java b/src/test/java/io/facturapi/FacturapiResourcesTest.java
index e4bbbec..e7705df 100644
--- a/src/test/java/io/facturapi/FacturapiResourcesTest.java
+++ b/src/test/java/io/facturapi/FacturapiResourcesTest.java
@@ -3,6 +3,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import io.facturapi.enums.CancellationStatus;
 import io.facturapi.enums.InvoiceStatus;
@@ -143,6 +144,33 @@ void organizationListLiveApiKeysIsTyped() {
     assertEquals("/v2/organizations/org_1/apikeys/live", request.uri().getPath());
   }
 
+  @Test
+  void organizationDefaultSeriesCanBeUpdated() {
+    StubHttpClient httpClient = new StubHttpClient();
+    httpClient.enqueueJson(200, "{\"id\":\"org_1\"}");
+
+    Facturapi sdk = new Facturapi(
+      FacturapiConfig.builder("sk_test")
+        .httpClient(httpClient.client())
+        .build()
+    );
+
+    var response = sdk.organizations().updateDefaultSeries(
+      "org_1",
+      Map.of(
+        "type", "I",
+        "series", "A"
+      )
+    );
+
+    assertEquals("org_1", response.getId());
+    var request = httpClient.requests().get(0);
+    assertEquals("PUT", request.method());
+    assertEquals("/v2/organizations/org_1/series-group/default-series", request.uri().getPath());
+    assertTrue(request.bodyUtf8().contains("\"type\":\"I\""));
+    assertTrue(request.bodyUtf8().contains("\"series\":\"A\""));
+  }
+
   @Test
   void invoiceComplementsAreTypedForPagoNominaAndCustom() {
     StubHttpClient httpClient = new StubHttpClient();