diff --git a/Directory.Packages.props b/Directory.Packages.props
index 1a5f1f0dc..dc3a3b92a 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -2,7 +2,7 @@
   <PropertyGroup>
     <EFCoreVersion>7.0.0-preview.7.22359.1</EFCoreVersion>
     <MicrosoftExtensionsVersion>7.0.0-preview.6.22354.1</MicrosoftExtensionsVersion>
-    <NpgsqlVersion>7.0.0-preview.5</NpgsqlVersion>
+    <NpgsqlVersion>7.0.0-preview.6-ci.20220710T074055</NpgsqlVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/EFCore.PG.NTS/Query/ExpressionTranslators/Internal/NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin.cs b/src/EFCore.PG.NTS/Query/ExpressionTranslators/Internal/NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin.cs
index a55ead297..91ee33ebc 100644
--- a/src/EFCore.PG.NTS/Query/ExpressionTranslators/Internal/NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin.cs
+++ b/src/EFCore.PG.NTS/Query/ExpressionTranslators/Internal/NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin.cs
@@ -36,6 +36,9 @@ private static readonly MethodInfo ConvexHullMethod
     private static readonly MethodInfo UnionMethod
         = typeof(UnaryUnionOp).GetRuntimeMethod(nameof(UnaryUnionOp.Union), new[] { typeof(IEnumerable<Geometry>) })!;
 
+    private static readonly MethodInfo EnvelopeCombineMethod
+        = typeof(EnvelopeCombiner).GetRuntimeMethod(nameof(EnvelopeCombiner.CombineAsGeometry), new[] { typeof(IEnumerable<Geometry>) })!;
+
     private readonly NpgsqlSqlExpressionFactory _sqlExpressionFactory;
     private readonly IRelationalTypeMappingSource _typeMappingSource;
 
@@ -51,44 +54,65 @@ public NpgsqlNetTopologySuiteAggregateMethodTranslator(
         MethodInfo method, EnumerableExpression source, IReadOnlyList<SqlExpression> arguments,
         IDiagnosticsLogger<DbLoggerCategory.Query> logger)
     {
-        if (source.Selector is not SqlExpression sqlExpression
-            || (method != GeometryCombineMethod && method != UnionMethod && method != ConvexHullMethod))
+        if (source.Selector is not SqlExpression sqlExpression)
         {
             return null;
         }
 
-        var resultTypeMapping = _typeMappingSource.FindMapping(typeof(Geometry), sqlExpression.TypeMapping?.StoreType ?? "geometry");
-
-        if (method == GeometryCombineMethod || method == UnionMethod)
+        if (method == ConvexHullMethod)
         {
-            return _sqlExpressionFactory.AggregateFunction(
-                method == GeometryCombineMethod ? "ST_Collect" : "ST_Union",
-                new[] { sqlExpression },
-                source,
+            // PostGIS has no built-in aggregate convex hull, but we can simply apply ST_Collect beforehand as recommended in the docs
+            // https://postgis.net/docs/ST_ConvexHull.html
+            return _sqlExpressionFactory.Function(
+                "ST_ConvexHull",
+                new[]
+                {
+                    _sqlExpressionFactory.AggregateFunction(
+                        "ST_Collect",
+                        new[] { sqlExpression },
+                        source,
+                        nullable: true,
+                        argumentsPropagateNullability: new[] { false },
+                        typeof(Geometry),
+                        GetMapping())
+                },
                 nullable: true,
-                argumentsPropagateNullability: new[] { false },
+                argumentsPropagateNullability: new[] { true },
                 typeof(Geometry),
-                resultTypeMapping);
+                GetMapping());
         }
 
-        // PostGIS has no built-in aggregate convex hull, but we can simply apply ST_Collect beforehand as recommended in the docs
-        // https://postgis.net/docs/ST_ConvexHull.html
-        return _sqlExpressionFactory.Function(
-            "ST_ConvexHull",
-            new[]
-            {
+        if (method == EnvelopeCombineMethod)
+        {
+            // ST_Extent returns a PostGIS box2d, which isn't a geometry and has no binary output function.
+            // Convert it to a geometry first.
+            return _sqlExpressionFactory.Convert(
                 _sqlExpressionFactory.AggregateFunction(
-                    "ST_Collect",
+                    "ST_Extent",
                     new[] { sqlExpression },
                     source,
                     nullable: true,
                     argumentsPropagateNullability: new[] { false },
                     typeof(Geometry),
-                    resultTypeMapping)
-            },
-            nullable: true,
-            argumentsPropagateNullability: new[] { true },
-            typeof(Geometry),
-            resultTypeMapping);
+                    GetMapping()),
+                typeof(Geometry), GetMapping());
+        }
+
+        if (method == UnionMethod || method == GeometryCombineMethod)
+        {
+            return _sqlExpressionFactory.AggregateFunction(
+                method == UnionMethod ? "ST_Union" : "ST_Collect",
+                new[] { sqlExpression },
+                source,
+                nullable: true,
+                argumentsPropagateNullability: new[] { false },
+                typeof(Geometry),
+                GetMapping());
+        }
+
+        return null;
+
+        RelationalTypeMapping? GetMapping()
+            => _typeMappingSource.FindMapping(typeof(Geometry), sqlExpression.TypeMapping?.StoreType ?? "geometry");
     }
 }
diff --git a/src/EFCore.PG/Storage/Internal/NpgsqlRelationalConnection.cs b/src/EFCore.PG/Storage/Internal/NpgsqlRelationalConnection.cs
index 767c55e3f..a452d9055 100644
--- a/src/EFCore.PG/Storage/Internal/NpgsqlRelationalConnection.cs
+++ b/src/EFCore.PG/Storage/Internal/NpgsqlRelationalConnection.cs
@@ -47,7 +47,9 @@ protected override DbConnection CreateDbConnection()
 
         if (ProvidePasswordCallback is not null)
         {
+#pragma warning disable 618 // ProvidePasswordCallback is obsolete
             conn.ProvidePasswordCallback = ProvidePasswordCallback;
+#pragma warning restore 618
         }
 
         return conn;
diff --git a/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeographyTest.cs b/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeographyTest.cs
index dbbadde7b..0055ed5c9 100644
--- a/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeographyTest.cs
+++ b/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeographyTest.cs
@@ -260,6 +260,7 @@ public override async Task ToText(bool async)
 
     public override Task Boundary(bool async)                        => Task.CompletedTask;
     public override Task Combine_aggregate(bool async)               => Task.CompletedTask;
+    public override Task EnvelopeCombine_aggregate(bool async)       => Task.CompletedTask;
     public override Task Contains(bool async)                        => Task.CompletedTask;
     public override Task ConvexHull(bool async)                      => Task.CompletedTask;
     public override Task ConvexHull_aggregate(bool async)            => Task.CompletedTask;
diff --git a/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeometryTest.cs b/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeometryTest.cs
index 240f970da..3d7875a50 100644
--- a/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeometryTest.cs
+++ b/test/EFCore.PG.FunctionalTests/Query/SpatialQueryNpgsqlGeometryTest.cs
@@ -91,6 +91,17 @@ public override async Task Combine_aggregate(bool async)
 GROUP BY p.""Group""");
     }
 
+    public override async Task EnvelopeCombine_aggregate(bool async)
+    {
+        await base.EnvelopeCombine_aggregate(async);
+
+        AssertSql(
+            @"SELECT p.""Group"" AS ""Id"", ST_Extent(p.""Point"")::geometry AS ""Combined""
+FROM ""PointEntity"" AS p
+WHERE (p.""Point"" IS NOT NULL)
+GROUP BY p.""Group""");
+    }
+
     public override async Task Contains(bool async)
     {
         await base.Contains(async);