diff --git a/.github/workflows/IKVM.Maven.yml b/.github/workflows/IKVM.Maven.yml
index 7e724c9..df1d5c2 100644
--- a/.github/workflows/IKVM.Maven.yml
+++ b/.github/workflows/IKVM.Maven.yml
@@ -48,6 +48,10 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 7.0.x
+    - name: Setup .NET 8.0
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 8.0.x
     - name: Install GitVersion
       uses: gittools/actions/gitversion/setup@v0
       with:
@@ -199,6 +203,10 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 7.0.x
+    - name: Setup .NET 8.0
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 8.0.x
     - name: Set up Java 8
       uses: actions/setup-java@v4
       with:
diff --git a/global.json b/global.json
index 423ec2b..7ae75c3 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
     "sdk": {
-        "version": "7.0.100",
+        "version": "8.0.100",
         "rollForward": "latestFeature"
     },
     "msbuild-sdks": {
diff --git a/src/IKVM.Maven.Sdk.Tasks/MavenEnvironment.cs b/src/IKVM.Maven.Sdk.Tasks/MavenEnvironment.cs
index 0c76d5e..478d438 100644
--- a/src/IKVM.Maven.Sdk.Tasks/MavenEnvironment.cs
+++ b/src/IKVM.Maven.Sdk.Tasks/MavenEnvironment.cs
@@ -216,7 +216,7 @@ ProxySelector CreateProxySelector()
         {
             var selector = new DefaultProxySelector();
 
-            foreach (var proxy in settings.getProxies().AsEnumerable<org.apache.maven.settings.Proxy>())
+            foreach (var proxy in settings.getProxies().AsList<org.apache.maven.settings.Proxy>())
             {
                 // build authentication information from server record
                 var builder = new AuthenticationBuilder();
@@ -239,7 +239,7 @@ MirrorSelector CreateMirrorSelector()
         {
             var selector = new DefaultMirrorSelector();
 
-            foreach (var mirror in settings.getMirrors().AsEnumerable<Mirror>())
+            foreach (var mirror in settings.getMirrors().AsList<Mirror>())
                 selector.add(mirror.getId(), mirror.getUrl(), mirror.getLayout(), false, false, mirror.getMirrorOf(), mirror.getMirrorOfLayouts());
 
             return selector;
@@ -253,7 +253,7 @@ AuthenticationSelector CreateAuthenticationSelector()
         {
             var selector = new DefaultAuthenticationSelector();
 
-            foreach (Server server in (IEnumerable)settings.getServers())
+            foreach (var server in settings.getServers().AsList<Server>())
             {
                 // build authentication information from server record
                 var builder = new AuthenticationBuilder();
@@ -303,26 +303,34 @@ List CreateRemoteRepositories(IList<MavenRepositoryItem> import, TaskLoggingHelp
             var activeProfiles = settings.getActiveProfiles().AsList<string>();
 
             // import profile repositories
-            foreach (var repository in activeProfiles.SelectMany(i => profiles[i].getRepositories().AsList<Repository>()))
-                map[repository.getId()] = new RemoteRepository.Builder(repository.getId(), DefaultRepositoryType, repository.getUrl());
+            foreach (var profileId in activeProfiles)
+                if (profiles.TryGetValue(profileId, out var profile))
+                    foreach (var repository in profile.getRepositories().AsList<Repository>())
+                        map[repository.getId()] = new RemoteRepository.Builder(repository.getId(), DefaultRepositoryType, repository.getUrl());
 
             // override repository with imports
             foreach (var repository in import)
                 map[repository.Id] = new RemoteRepository.Builder(repository.Id, DefaultRepositoryType, repository.Url);
 
             // merge profile settings
-            foreach (var repository in activeProfiles.SelectMany(i => profiles[i].getRepositories().AsList<Repository>()))
+            foreach (var profileId in activeProfiles)
             {
-                if (map.TryGetValue(repository.getId(), out var r) == false)
-                    continue;
-
-                var releases = repository.getReleases();
-                if (releases != null)
-                    r.setPolicy(new org.eclipse.aether.repository.RepositoryPolicy(releases.isEnabled(), releases.getUpdatePolicy(), releases.getChecksumPolicy()));
-
-                var snapshots = repository.getSnapshots();
-                if (snapshots != null)
-                    r.setSnapshotPolicy(new org.eclipse.aether.repository.RepositoryPolicy(snapshots.isEnabled(), snapshots.getUpdatePolicy(), snapshots.getChecksumPolicy()));
+                if (profiles.TryGetValue(profileId, out var profile))
+                {
+                    foreach (var repository in profile.getRepositories().AsList<Repository>())
+                    {
+                        if (map.TryGetValue(repository.getId(), out var builder) == false)
+                            continue;
+
+                        var releases = repository.getReleases();
+                        if (releases != null)
+                            builder.setPolicy(new org.eclipse.aether.repository.RepositoryPolicy(releases.isEnabled(), releases.getUpdatePolicy(), releases.getChecksumPolicy()));
+
+                        var snapshots = repository.getSnapshots();
+                        if (snapshots != null)
+                            builder.setSnapshotPolicy(new org.eclipse.aether.repository.RepositoryPolicy(snapshots.isEnabled(), snapshots.getUpdatePolicy(), snapshots.getChecksumPolicy()));
+                    }
+                }
             }
 
             // merge server settings