diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index d06b93d..66b7534 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,7 +1,7 @@
 Release notes
 ==============
 
-### Unreleased
+### 0.21.9 (2023-04-20)
 
 * `DELETE` resource operations now writes top-level meta just like other responses. If there is top-level meta, the
   response code is `200`.
diff --git a/src/Felicity/Felicity.fsproj b/src/Felicity/Felicity.fsproj
index ea9c526..0cad6a3 100644
--- a/src/Felicity/Felicity.fsproj
+++ b/src/Felicity/Felicity.fsproj
@@ -13,7 +13,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageTags>f# fsharp jsonapi json-api json:api api rest rest-api api-rest api-server api-client web-api asp-net-core aspnetcore giraffe framework</PackageTags>
     <PackageIcon>felicity-logo-128x128.png</PackageIcon>
-    <Version>0.21.8</Version>
+    <Version>0.21.9</Version>
     <PackageReleaseNotes>https://github.com/cmeeren/Felicity/blob/master/RELEASE_NOTES.md</PackageReleaseNotes>
   </PropertyGroup>