diff --git a/OpenXmlFormats/Properties/AssemblyInfo.cs b/OpenXmlFormats/Properties/AssemblyInfo.cs
index 0fdba96df..a318a3782 100644
--- a/OpenXmlFormats/Properties/AssemblyInfo.cs
+++ b/OpenXmlFormats/Properties/AssemblyInfo.cs
@@ -33,8 +33,8 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.5.6.0")]
-[assembly: AssemblyFileVersion("2.5.6.0")]
+[assembly: AssemblyVersion("2.6.0.0")]
+[assembly: AssemblyFileVersion("2.6.0.0")]
 [assembly: AssemblyInformationalVersion("2.0.0.0")]
 #if NETSTANDARD2_1 || NETSTANDARD2_0 || NET40
 [assembly: AllowPartiallyTrustedCallers]
diff --git a/main/Properties/AssemblyInfo.cs b/main/Properties/AssemblyInfo.cs
index f4ea20ca3..a68e2de2a 100644
--- a/main/Properties/AssemblyInfo.cs
+++ b/main/Properties/AssemblyInfo.cs
@@ -33,8 +33,8 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.5.6.0")]
-[assembly: AssemblyFileVersion("2.5.6.0")]
+[assembly: AssemblyVersion("2.6.0.0")]
+[assembly: AssemblyFileVersion("2.6.0.0")]
 [assembly: AssemblyInformationalVersion("2.0.0.0")]
 
 [assembly: InternalsVisibleTo("NPOI.TestCases, PublicKey=002400000480000094000000060200000024000052534131000400000100010095ccd95af3b39d8bc20544d3f47fd24b53ebc5ccb693eaed116290629f8cd882c827ebd511ad59449224f0718d3f9d03b64945a6c8b6644266001b8c8426185330e3d96da70ae16d4acc21b8d4d480f1385c7e924273179375aa88f81380a72fb115712a313379d16aed4aa36208ee3b4a5dd785b06a07b2d868e3227f4495b5", AllInternalsVisible = true)]
diff --git a/ooxml/Properties/AssemblyInfo.cs b/ooxml/Properties/AssemblyInfo.cs
index 80cb2551b..a24a6643e 100644
--- a/ooxml/Properties/AssemblyInfo.cs
+++ b/ooxml/Properties/AssemblyInfo.cs
@@ -33,8 +33,8 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below: 
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.5.6.0")]
-[assembly: AssemblyFileVersion("2.5.6.0")]
+[assembly: AssemblyVersion("2.6.0.0")]
+[assembly: AssemblyFileVersion("2.6.0.0")]
 [assembly: AssemblyInformationalVersion("2.0.0.0")]
 
 //[assembly: InternalsVisibleTo("ooxml.Testcases")]
diff --git a/openxml4Net/Properties/AssemblyInfo.cs b/openxml4Net/Properties/AssemblyInfo.cs
index 393b36675..eb6e36ed4 100644
--- a/openxml4Net/Properties/AssemblyInfo.cs
+++ b/openxml4Net/Properties/AssemblyInfo.cs
@@ -33,8 +33,8 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.5.6.0")]
-[assembly: AssemblyFileVersion("2.5.6.0")]
+[assembly: AssemblyVersion("2.6.0.0")]
+[assembly: AssemblyFileVersion("2.6.0.0")]
 [assembly: AssemblyInformationalVersion("2.0.0.0")]
 #if NETSTANDARD2_1 || NETSTANDARD2_0 || NET40
 [assembly: AllowPartiallyTrustedCallers]