diff --git a/README.md b/README.md
index a8183110..26df3a2a 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ DryIoc is fast, small, full-featured IoC Container for .NET
     - __DryIoc__ (source code) [![NuGet Badge](https://buildstats.info/nuget/DryIoc)](https://www.nuget.org/packages/DryIoc)
     - __DryIoc.Internal__ (source code with public types made internal) [![NuGet Badge](https://buildstats.info/nuget/DryIoc.Internal)](https://www.nuget.org/packages/DryIoc.Internal)
 
-- [Release Notes](https://github.com/dadhi/DryIoc/releases/tag/v4.8.2) :: [Previous Versions](https://github.com/dadhi/DryIoc/blob/master/docs/DryIoc.Docs/VersionHistory.md)
+- [Release Notes](https://github.com/dadhi/DryIoc/releases/tag/v4.8.3) :: [Previous Versions](https://github.com/dadhi/DryIoc/blob/master/docs/DryIoc.Docs/VersionHistory.md)
 - [Extensions and Companions](Extensions.md)
 - [Documentation][WikiHome]
 - [Contribution guide](CONTRIBUTING.md)
diff --git a/appveyor.yml b/appveyor.yml
index c8bda0bf..311beb1b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 4.8.2-preview-01-b{build}
+version: 4.8.3-preview-01-b{build}
 os: Visual Studio 2017
 test: off
 
diff --git a/docs/DryIoc.Docs/VersionHistory.md b/docs/DryIoc.Docs/VersionHistory.md
index f9bdb4a6..8646219d 100644
--- a/docs/DryIoc.Docs/VersionHistory.md
+++ b/docs/DryIoc.Docs/VersionHistory.md
@@ -1,7 +1,12 @@
 Version History
 ---------------
 
-## v4.8.2 Improvement release
+## v4.8.3 Bug-fix release / 2021-10-21
+
+- fixed: #418 Resolving interfaces with covariant type parameter fails when using RegisterMapping
+- fixed: #432 Resolving interfaces with contravariant type parameter fails with RegisteringImplementationNotAssignableToServiceType error
+
+## v4.8.2 Improvement release / 2021-10
 
 - fixed: #429 Memory leak on MS DI with Disposable Transient
 
diff --git a/nuspecs/DryIoc.Internal.nuspec b/nuspecs/DryIoc.Internal.nuspec
index a061ae86..dcc5cc88 100644
--- a/nuspecs/DryIoc.Internal.nuspec
+++ b/nuspecs/DryIoc.Internal.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
     <metadata minClientVersion="3.3.0">
         <id>DryIoc.Internal</id>
-        <version>4.8.2</version>
+        <version>4.8.3</version>
         <authors>Maksim Volkau</authors>
         <copyright>Copyright © 2013-2021 Maksim Volkau</copyright>
         <projectUrl>https://github.com/dadhi/DryIoc</projectUrl>
@@ -14,6 +14,10 @@
         <tags>IoC Container Inversion-of-Control DI Dependency-Injection DRY Service-Provider Factory</tags>
         <releaseNotes>
 <![CDATA[
+## v4.8.3 Bug-fix release
+
+- fixed: #418 Resolving interfaces with covariant type parameter fails when using RegisterMapping
+- fixed: #432 Resolving interfaces with contravariant type parameter fails with RegisteringImplementationNotAssignableToServiceType error
 
 ## v4.8.2 Improvement release
 
diff --git a/nuspecs/DryIoc.nuspec b/nuspecs/DryIoc.nuspec
index 35497969..cd1b3fa2 100644
--- a/nuspecs/DryIoc.nuspec
+++ b/nuspecs/DryIoc.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
     <metadata minClientVersion="3.3.0">
         <id>DryIoc</id>
-        <version>4.8.2</version>
+        <version>4.8.3</version>
         <authors>Maksim Volkau</authors>
         <copyright>Copyright © 2013-2021 Maksim Volkau</copyright>
         <projectUrl>https://github.com/dadhi/DryIoc</projectUrl>
@@ -14,6 +14,10 @@
         <tags>IoC Container Inversion-of-Control DI Dependency-Injection DRY Service-Provider Factory</tags>
         <releaseNotes>
 <![CDATA[
+## v4.8.3 Bug-fix release
+
+- fixed: #418 Resolving interfaces with covariant type parameter fails when using RegisterMapping
+- fixed: #432 Resolving interfaces with contravariant type parameter fails with RegisteringImplementationNotAssignableToServiceType error
 
 ## v4.8.2 Improvement release
 
diff --git a/src/DryIoc/DryIoc.csproj b/src/DryIoc/DryIoc.csproj
index fd97202b..4961858b 100644
--- a/src/DryIoc/DryIoc.csproj
+++ b/src/DryIoc/DryIoc.csproj
@@ -5,7 +5,7 @@
         <TargetFrameworks Condition="'$(NoLegacy)' == 'true'">net45;netstandard1.0;netstandard1.3;netstandard2.0</TargetFrameworks>
 
         <Product>DryIoc</Product>
-        <VersionPrefix>4.8.2</VersionPrefix>
+        <VersionPrefix>4.8.3</VersionPrefix>
         <VersionSuffix></VersionSuffix>
 
         <AssemblyName>$(Product)</AssemblyName>
@@ -17,6 +17,11 @@
         <PackageTags>IoC Container Inversion-of-Control DI Dependency-Injection DRY Service-Provider Factory FastExpressionCompiler ImTools</PackageTags>
         <PackageReleaseNotes>
 <![CDATA[
+## v4.8.3 Bug-fix release
+
+- fixed: #418 Resolving interfaces with covariant type parameter fails when using RegisterMapping
+- fixed: #432 Resolving interfaces with contravariant type parameter fails with RegisteringImplementationNotAssignableToServiceType error
+
 
 ## v4.8.2 Improvement release