diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4d610863..e2c3d751 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,8 +33,8 @@ jobs:
       with:
         dotnet-version: |
           3.1.426
-          6.0.404
-          7.0.101
+          6.0.408
+          7.0.302
 
     - name: Setup NuGet
       uses: nuget/setup-nuget@v1
diff --git a/global.json b/global.json
index 45e9ccc4..0dd10c6f 100644
--- a/global.json
+++ b/global.json
@@ -1,12 +1,20 @@
 {
   "sdk": {
-    "version": "7.0.203",
+    "version": "7.0.302",
     "allowPrerelease": true,
     "rollForward": "major"
   },
 
   "tools": {
-    "dotnet": "7.0.203"
+    "dotnet": "7.0.302",
+
+    "runtimes": {
+      "aspnetcore": [
+        "3.1.32",
+        "6.0.16",
+        "7.0.5"
+      ]
+    }
   },
 
   "msbuild-sdks": {
diff --git a/src/OpenIddict.Abstractions/Primitives/OpenIddictParameter.cs b/src/OpenIddict.Abstractions/Primitives/OpenIddictParameter.cs
index 498404e3..d8da9035 100644
--- a/src/OpenIddict.Abstractions/Primitives/OpenIddictParameter.cs
+++ b/src/OpenIddict.Abstractions/Primitives/OpenIddictParameter.cs
@@ -117,10 +117,10 @@ public readonly struct OpenIddictParameter : IEquatable<OpenIddictParameter>
 
                 // If the parameter is a JsonValue wrapping a well-known primitive type
                 // (e.g int or string), always return 0 as these types can't have a length.
-                JsonValue value when value.TryGetValue(out bool   _) ||
-                                     value.TryGetValue(out int    _) ||
-                                     value.TryGetValue(out long   _) ||
-                                     value.TryGetValue(out string _) => 0,
+                JsonValue value when value.TryGetValue(out bool    _) ||
+                                     value.TryGetValue(out int     _) ||
+                                     value.TryGetValue(out long    _) ||
+                                     value.TryGetValue(out string? _) => 0,
 
                 // If the parameter is any other JsonNode (e.g a JsonValue), serialize it
                 // to a JsonElement first to determine its actual JSON representation