diff --git a/appveyor.yml b/appveyor.yml
index cf616733..327a180a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 4.0.{build}
+version: 5.0.{build}
 branches:
   only:
   - master
diff --git a/src/ConfigCatClient/ConfigCatClient.csproj b/src/ConfigCatClient/ConfigCatClient.csproj
index 5d3f2d33..f697c602 100644
--- a/src/ConfigCatClient/ConfigCatClient.csproj
+++ b/src/ConfigCatClient/ConfigCatClient.csproj
@@ -15,7 +15,9 @@
           <PackageProjectUrl>https://github.com/ConfigCat/.net-sdk</PackageProjectUrl>
           <RepositoryUrl>https://github.com/ConfigCat/.net-sdk</RepositoryUrl>
           <RepositoryType>git</RepositoryType>
-          <PackageReleaseNotes>Version 4.0.0
+          <PackageReleaseNotes>Version 5.0.0
+     * Breaking change: Renamed `API Key` to `SDK Key`.
+Version 4.0.0
      * Supporting sensitive text comparators.
 Version 3.2.0
      * Minor fix in info level logging