diff --git a/Package.resolved b/Package.resolved
index a1b8c78..9183d98 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,5 +1,5 @@
 {
-  "originHash" : "ebb16d1d1fcda74fd2dc0e0602e51cefaf7e287a565c2fb97f3924259fec5629",
+  "originHash" : "f3f9fc391509642da9593d2b621fe1a85a1b66c4e7197e28b38bf613cc7baabf",
   "pins" : [
     {
       "identity" : "swift-atomics",
@@ -42,8 +42,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-nio.git",
       "state" : {
-        "revision" : "1b33db2dea6a64d5b619b9e888175133c6d7f410",
-        "version" : "2.73.0"
+        "revision" : "f7dc3f527576c398709b017584392fb58592e7f5",
+        "version" : "2.75.0"
       }
     },
     {
@@ -51,8 +51,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-nio-ssl.git",
       "state" : {
-        "revision" : "a9fa5efd86e7ce2e5c1b6de113262e58035ca251",
-        "version" : "2.27.1"
+        "revision" : "d7ceaf0e4d8001cd35cdc12e42cdd281e9e564e8",
+        "version" : "2.28.0"
       }
     },
     {
diff --git a/Sources/MongoBuiltins/Expressions/Mongo.ExpressionEncoder.swift b/Sources/MongoBuiltins/Expressions/Mongo.ExpressionEncoder.swift
index d9d60ef..7fb5652 100644
--- a/Sources/MongoBuiltins/Expressions/Mongo.ExpressionEncoder.swift
+++ b/Sources/MongoBuiltins/Expressions/Mongo.ExpressionEncoder.swift
@@ -150,8 +150,26 @@ extension Mongo.ExpressionEncoder
     enum Cond:String, Sendable
     {
         case cond = "$cond"
+
+        @frozen public
+        enum Clause:String, Sendable
+        {
+            case `if`
+            case  then
+            case `else`
+        }
+    }
+
+    @inlinable public
+    subscript(key:Cond, yield:(inout Mongo.SetEncoder<Cond.Clause>) -> ()) -> Void
+    {
+        mutating get
+        {
+            yield(&self.bson[with: key][as: Mongo.SetEncoder<Cond.Clause>.self])
+        }
     }
 
+    @available(*, deprecated, message: "Use subscript(_:_:) instead.")
     @inlinable public
     subscript<Predicate, Then, Else>(key:Cond) -> (if:Predicate?, then:Then?, else:Else?)
         where   Predicate:BSONEncodable,