diff --git a/src/OpenIddict.Core/project.json b/src/OpenIddict.Core/project.json
index 2e2ade8a..a6b8869c 100644
--- a/src/OpenIddict.Core/project.json
+++ b/src/OpenIddict.Core/project.json
@@ -35,7 +35,7 @@
   "dependencies": {
     "AspNet.Security.OpenIdConnect.Primitives": "1.0.0-rc1-*",
     "CryptoHelper": "2.0.0",
-    "JetBrains.Annotations": { "type": "build", "version": "10.1.4" },
+    "JetBrains.Annotations": { "type": "build", "version": "10.3.0" },
     "Microsoft.Extensions.DependencyInjection.Abstractions": "1.0.0",
     "Microsoft.Extensions.Logging.Abstractions": "1.0.0",
     "Microsoft.Extensions.Options": "1.0.0",
@@ -49,12 +49,7 @@
       "dependencies": {
         "System.Reflection.TypeExtensions": "4.1.0",
         "System.Security.Claims": "4.0.1"
-      },
-
-      "imports": [
-        "dotnet5.4",
-        "portable-net451+win8"
-      ]
+      }
     }
   }
 }
diff --git a/src/OpenIddict.EntityFrameworkCore/project.json b/src/OpenIddict.EntityFrameworkCore/project.json
index d9276ee7..6003cf31 100644
--- a/src/OpenIddict.EntityFrameworkCore/project.json
+++ b/src/OpenIddict.EntityFrameworkCore/project.json
@@ -33,7 +33,7 @@
   },
 
   "dependencies": {
-    "JetBrains.Annotations": { "type": "build", "version": "10.1.4" },
+    "JetBrains.Annotations": { "type": "build", "version": "10.3.0" },
     "Microsoft.EntityFrameworkCore.Relational": "1.0.0",
     "OpenIddict.Core": { "target": "project" }
   },
@@ -44,12 +44,7 @@
     "netstandard1.3": {
       "dependencies": {
         "System.ComponentModel.TypeConverter": "4.1.0"
-      },
-
-      "imports": [
-        "dotnet5.4",
-        "portable-net451+win8"
-      ]
+      }
     }
   }
 }
\ No newline at end of file
diff --git a/src/OpenIddict.Mvc/project.json b/src/OpenIddict.Mvc/project.json
index d5e4f2c9..1241a1b0 100644
--- a/src/OpenIddict.Mvc/project.json
+++ b/src/OpenIddict.Mvc/project.json
@@ -34,19 +34,13 @@
 
   "dependencies": {
     "AspNet.Security.OpenIdConnect.Server": "1.0.0-rc1-*",
-    "JetBrains.Annotations": { "type": "build", "version": "10.1.4" },
+    "JetBrains.Annotations": { "type": "build", "version": "10.3.0" },
     "Microsoft.AspNetCore.Mvc.Core": "1.0.0",
     "OpenIddict.Core": { "target": "project" }
   },
 
   "frameworks": {
     "net451": { },
-
-    "netstandard1.6": {
-      "imports": [
-        "dotnet5.7",
-        "portable-net451+win8"
-      ]
-    }
+    "netstandard1.6": { }
   }
 }
\ No newline at end of file
diff --git a/src/OpenIddict/project.json b/src/OpenIddict/project.json
index 81f5cce3..5ed941b1 100644
--- a/src/OpenIddict/project.json
+++ b/src/OpenIddict/project.json
@@ -34,7 +34,7 @@
 
   "dependencies": {
     "AspNet.Security.OpenIdConnect.Server": "1.0.0-rc1-*",
-    "JetBrains.Annotations": { "type": "build", "version": "10.1.4" },
+    "JetBrains.Annotations": { "type": "build", "version": "10.3.0" },
     "Microsoft.AspNetCore.Diagnostics.Abstractions": "1.0.0",
     "Microsoft.Extensions.Caching.Abstractions": "1.0.0",
     "OpenIddict.Core": { "target": "project" }
@@ -42,12 +42,6 @@
 
   "frameworks": {
     "net451": { },
-
-    "netstandard1.4": {
-      "imports": [
-        "dotnet5.5",
-        "portable-net451+win8"
-      ]
-    }
+    "netstandard1.4": { }
   }
 }
\ No newline at end of file
diff --git a/test/OpenIddict.Core.Tests/project.json b/test/OpenIddict.Core.Tests/project.json
index 3f4bd63a..ff0f66d9 100644
--- a/test/OpenIddict.Core.Tests/project.json
+++ b/test/OpenIddict.Core.Tests/project.json
@@ -15,12 +15,7 @@
     "netcoreapp1.0": {
       "dependencies": {
         "Microsoft.NETCore.App": { "type": "platform", "version": "1.0.0" }
-      },
-
-      "imports": [
-        "dnxcore50",
-        "portable-net451+win8"
-      ]
+      }
     },
 
     "net451": {
diff --git a/test/OpenIddict.EntityFrameworkCore.Tests/project.json b/test/OpenIddict.EntityFrameworkCore.Tests/project.json
index 7375f80e..b07ab471 100644
--- a/test/OpenIddict.EntityFrameworkCore.Tests/project.json
+++ b/test/OpenIddict.EntityFrameworkCore.Tests/project.json
@@ -15,12 +15,7 @@
     "netcoreapp1.0": {
       "dependencies": {
         "Microsoft.NETCore.App": { "type": "platform", "version": "1.0.0" }
-      },
-
-      "imports": [
-        "dnxcore50",
-        "portable-net451+win8"
-      ]
+      }
     },
 
     "net451": {
diff --git a/test/OpenIddict.Mvc.Tests/project.json b/test/OpenIddict.Mvc.Tests/project.json
index ee355812..49b9bfc5 100644
--- a/test/OpenIddict.Mvc.Tests/project.json
+++ b/test/OpenIddict.Mvc.Tests/project.json
@@ -15,12 +15,7 @@
     "netcoreapp1.0": {
       "dependencies": {
         "Microsoft.NETCore.App": { "type": "platform", "version": "1.0.0" }
-      },
-
-      "imports": [
-        "dnxcore50",
-        "portable-net451+win8"
-      ]
+      }
     },
 
     "net451": {
diff --git a/test/OpenIddict.Tests/project.json b/test/OpenIddict.Tests/project.json
index 1105d4e7..df2f55b5 100644
--- a/test/OpenIddict.Tests/project.json
+++ b/test/OpenIddict.Tests/project.json
@@ -30,12 +30,7 @@
 
       "dependencies": {
         "Microsoft.NETCore.App": { "type": "platform", "version": "1.0.0" }
-      },
-
-      "imports": [
-        "dnxcore50",
-        "portable-net451+win8"
-      ]
+      }
     },
 
     "net451": {