diff --git a/Support/Change_History/COPASI_4_43_Build_288/index.html b/Support/Change_History/COPASI_4_43_Build_288/index.html
new file mode 100644
index 000000000..3fdbe08b5
--- /dev/null
+++ b/Support/Change_History/COPASI_4_43_Build_288/index.html
@@ -0,0 +1,61 @@
+---
+layout: structure
+title: "COPASI 4.43 Build 288"
+structure: "Change_History"
+---
+
+<div class="row">
+  <div class="col-xs-12">
+    <h3 >Version 4.43.288</h3>
+    Release Date: April 28, 2024<br />
+
+    <h4>New Features since COPASI 4.42 (Build 284)</h4>
+    <ul>
+      <li> Standards 
+        <ul>
+          <li>
+            SBML: Added support of SBML Level 3 Version 2
+          </li>
+        </ul>
+      </li>
+    </ul>
+
+    <h4>Bug Fixes since COPASI 4.42 (Build 284)</h4>
+    <ul>
+      <li> Graphical User Interface (CopasiUI)
+        <ul>
+          <li>
+            Event Overview: The assignments associated with an event are no properly displayed.
+          </li>
+          <li>
+            Optimization: Changing of the subtask is now preserved without running the optimization task.
+          </li>
+          <li>
+            Task and subtask names are now consistently handled in sensitivities, optimization, and scan.
+          </li>
+          <li>
+            Scan Task: Improved handling of output from subtask by allowing finer control over when output is captured.
+          </li>
+        </ul>
+       </ul>
+      </li>
+      <li> Simulation Engine
+        <ul>
+          <li>
+            Fix calculations involving constant rates which were in certain situations (e.g. event assignments) not correctly updated.
+          </li>
+        </ul>
+      </li>
+      <li> API
+        <ul>
+          <li>
+            In the case that multiple data models with the same name where loaded simultaneously, renaming an object in one data model does not longer effect references the other models. 
+          </li>
+          <li>
+            Setting CCopasiParameter values directly will now result in a call to the parent group to assure proper synchronization of related parameters.
+          </li>
+        </ul>
+      </li>
+    </ul>
+  </div>
+</div>
diff --git a/Support/Change_History/index.html b/Support/Change_History/index.html
index 8c9b86d65..cba64d7dc 100644
--- a/Support/Change_History/index.html
+++ b/Support/Change_History/index.html
@@ -15,6 +15,11 @@
         </th>
       </thead>
       <tbody>
+        <tr>
+          <td>COPASI 4.43 (Build 288) </td>
+          <td> April 29, 2024 </td>
+          <td> <a title="COPASI: Support/Change History/COPASI 4.43 Build 288" href="{{ site.baseurl }}/Support/Change_History/COPASI_4_43_Build_288/" >changelog</a></td>
+        </tr>
         <tr>
           <td>COPASI 4.42 (Build 284) </td>
           <td> December 1, 2023 </td>
diff --git a/_data/structure/Change_History.yml b/_data/structure/Change_History.yml
index a8228004b..98637d6e0 100644
--- a/_data/structure/Change_History.yml
+++ b/_data/structure/Change_History.yml
@@ -1,6 +1,8 @@
 pages:
 - path: Support/Change_History
   title: "Change History"
+- path: Support/Change_History/COPASI_4_43_Build_288
+  title: "COPASI 4.43 (Build 288)"
 - path: Support/Change_History/COPASI_4_42_Build_284
   title: "COPASI 4.42 (Build 284)"
 - path: Support/Change_History/COPASI_4_41_Build_283
diff --git a/_posts/2024-04-29-Release.md b/_posts/2024-04-29-Release.md
new file mode 100644
index 000000000..78596cb5a
--- /dev/null
+++ b/_posts/2024-04-29-Release.md
@@ -0,0 +1,33 @@
+--- 
+layout: "post" 
+title:  "COPASI 4.43 (Build 288) Released" 
+author: "Stefan Hoops" 
+topic:  "Release" 
+date:   "2024-04-29 1:00:00" 
+excerpt_separator: <!--more--> 
+--- 
+ 
+### The COPASI team announces the immediate availability of the stable release COPASI 4.42 (Build 284).
+ 
+A new release of COPASI has been made available. Please visit our [free download]({{ site.baseurl }}/Download/) page to retrieve this latest development release. Please note this version is released under the [Artistic License 2.0]({{ site.baseurl }}/Download/License/), which is an [OSI](https://www.opensource.org/) approved license. This license allows non-commercial and commercial use free of charge. 
+ 
+Release Date: April 29, 2024 
+
+#### New Features
+* Standards 
+  * SBML: Added support of SBML Level 3 Version 2
+  
+#### Bug Fixes
+* Graphical User Interface (CopasiUI)
+  * Event Overview: The assignments associated with an event are no properly displayed.
+  * Optimization: Changing of the subtask is now preserved without running the optimization task.
+  * Task and subtask names are now consistently handled in sensitivities, optimization, and scan.
+  * Scan Task: Improved handling of output from subtask by allowing finer control over when output is captured.
+* Simulation Engine
+  * Fix calculations involving constant rates which were in certain situations (e.g. event assignments) not correctly updated.
+* Language Bindings
+  * In the case that multiple data models with the same name where loaded simultaneously, renaming an object in one data model does not longer effect references the other models. 
+  * Setting CCopasiParameter values directly will now result in a call to the parent group to assure proper synchronization of related parameters.
+
+More information can be found in the 
+[changelog]({{ site.baseurl }}/Support/Change_History/COPASI_4_43_Build_288/).