diff --git a/src/flatcollections-array/FlatArray/FlatArray.csproj b/src/flatcollections-array/FlatArray/FlatArray.csproj
index 1ac26b16..449434b3 100644
--- a/src/flatcollections-array/FlatArray/FlatArray.csproj
+++ b/src/flatcollections-array/FlatArray/FlatArray.csproj
@@ -17,7 +17,7 @@
     <Description>PrimeFuncPack Core.FlatArray is a core library for .NET consisting of immutable FlatArray targeted for use in functional programming.</Description>
     <RootNamespace>System</RootNamespace>
     <AssemblyName>PrimeFuncPack.Core.FlatArray</AssemblyName>
-    <Version>1.2.1-preview.1</Version>
+    <Version>1.2.1</Version>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/flatcollections/FlatCollections/FlatCollections.csproj b/src/flatcollections/FlatCollections/FlatCollections.csproj
index fda22a47..d12f1a13 100644
--- a/src/flatcollections/FlatCollections/FlatCollections.csproj
+++ b/src/flatcollections/FlatCollections/FlatCollections.csproj
@@ -17,7 +17,7 @@
     <Description>PrimeFuncPack Core.FlatCollections is a set of immutable Flat collections for .NET designed for developing business applications based on functional programming.</Description>
     <RootNamespace>System</RootNamespace>
     <AssemblyName>PrimeFuncPack.Core.FlatCollections</AssemblyName>
-    <Version>1.2.1-preview.1</Version>
+    <Version>1.2.1</Version>
   </PropertyGroup>
 
   <ItemGroup>
@@ -32,7 +32,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="PrimeFuncPack.Core.FlatArray" Version="1.2.1-preview.1" />
+    <PackageReference Include="PrimeFuncPack.Core.FlatArray" Version="1.2.1" />
   </ItemGroup>
 
 </Project>