diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index ab4aaa87..f5ee252e 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -17,7 +17,7 @@
     In case of bug fixes, please provide the list of supported branches where this fix should be also merged.
     Please uncomment following line, adjusting the corresponding target branches for the backport.
 -->
-<!-- @Mergifyio backport 4.1.x 4.0.x 3.3.x 2.1.x -->
+<!-- @Mergifyio backport 4.2.x 4.1.x 4.0.x 3.3.x 2.1.x -->
 
 <!-- If an issue is already opened, please uncomment next line with the corresponding issue number. -->
 <!-- Fixes #(issue) -->
diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 666f5571..f577c702 100644
--- a/.github/workflows/mirror.yml
+++ b/.github/workflows/mirror.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         dest_branch:
-          - '4.2.x'
+          - '4.3.x'
           - '4.x'
     steps:
     - name: Mirror action step
diff --git a/.github/workflows/nightly-ubuntu-ci.yml b/.github/workflows/nightly-ubuntu-ci.yml
index 5ed1f0b9..409f3fae 100644
--- a/.github/workflows/nightly-ubuntu-ci.yml
+++ b/.github/workflows/nightly-ubuntu-ci.yml
@@ -27,13 +27,34 @@ jobs:
       run-tests: true
       use-ccache: false
 
+  nightly-ubuntu-ci-4_2_x-fast-3_4_x:
+      strategy:
+        fail-fast: false
+        matrix:
+          java-version:
+            - 'openjdk-11-jdk'
+            - 'openjdk-17-jdk'
+      uses: eProsima/Fast-DDS-Gen/.github/workflows/reusable-ubuntu-ci.yml@4.2.x
+      with:
+        os-version: 'ubuntu-22.04'
+        java-version: ${{ matrix.java-version }}
+        label: 'nightly-ubuntu-ci-4.2.x-3.4.x'
+        fastddsgen-branch: '4.2.x'
+        fastdds-branch: '3.4.x'
+        fastcdr-branch: '2.3.x'
+        fastdds-python-branch: '2.3.x'
+        discovery-server-branch: 'v2.0.0'
+        run-build: true
+        run-tests: true
+        use-ccache: false
+
   nightly-ubuntu-ci-4_1_x-fast-3_3_x:
       strategy:
         fail-fast: false
         matrix:
           java-version:
+            - 'openjdk-11-jdk'
             - 'openjdk-17-jdk'
-            - 'openjdk-21-jdk'
       uses: eProsima/Fast-DDS-Gen/.github/workflows/reusable-ubuntu-ci.yml@4.1.x
       with:
         os-version: 'ubuntu-22.04'
@@ -53,8 +74,8 @@ jobs:
         fail-fast: false
         matrix:
           java-version:
+            - 'openjdk-11-jdk'
             - 'openjdk-17-jdk'
-            - 'openjdk-21-jdk'
       uses: eProsima/Fast-DDS-Gen/.github/workflows/reusable-ubuntu-ci.yml@4.0.x
       with:
         os-version: 'ubuntu-22.04'
@@ -74,8 +95,8 @@ jobs:
       fail-fast: false
       matrix:
         java-version:
+          - 'openjdk-11-jdk'
           - 'openjdk-17-jdk'
-          - 'openjdk-21-jdk'
         fastcdr-branch:
           - '1.1.x'
           - '2.x'
diff --git a/.github/workflows/weekly-ubuntu-ci.yml b/.github/workflows/weekly-ubuntu-ci.yml
index 00973012..4e657459 100644
--- a/.github/workflows/weekly-ubuntu-ci.yml
+++ b/.github/workflows/weekly-ubuntu-ci.yml
@@ -10,7 +10,7 @@ jobs:
     uses: eProsima/Fast-DDS-Gen/.github/workflows/reusable-ubuntu-ci.yml@2.1.x
     with:
       os-version: 'ubuntu-20.04'
-      java-version: 'openjdk-17-jdk'
+      java-version: 'openjdk-11-jdk'
       label: 'weekly-ubuntu-ci-2.1.x'
       fastddsgen-branch: '2.1.x'
       fastdds-branch: '2.6.x'
diff --git a/build.gradle b/build.gradle
index fb979122..78489c04 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,7 +17,7 @@ apply plugin: 'java-library'
 apply plugin: 'eclipse' // Eclipse integration
 
 description = """"""
-def version_str = "4.2.0"
+def version_str = "4.3.0"
 
 import org.apache.tools.ant.taskdefs.condition.Os;
 import org.gradle.api.tasks.options.Option;
@@ -91,7 +91,7 @@ repositories {
 }
 
 dependencies {
-    implementation files('thirdparty/idl-parser/build/libs/idlparser-4.2.0.jar')
+    implementation files('thirdparty/idl-parser/build/libs/idlparser-4.3.0.jar')
     testImplementation('org.junit.jupiter:junit-jupiter:5.14.1')
     testRuntimeOnly('org.junit.platform:junit-platform-launcher')
 }
diff --git a/thirdparty/idl-parser b/thirdparty/idl-parser
index a12d6d83..f82a976f 160000
--- a/thirdparty/idl-parser
+++ b/thirdparty/idl-parser
@@ -1 +1 @@
-Subproject commit a12d6d83de2f04d72c251e76b768b8cf5a51c5e0
+Subproject commit f82a976fb78f48f0e309fe219f51803b1927124e