diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91857d18b7..3303baee97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Changed
 * Update FCS to 'Included get,set in range of AutoProperty', commit d508186f510681d1261291474e3f9f25485999a8
+* Update FCS to 'Add a Paren case to SynRationalConst', commit 97a5b6584b54707e3e8541fe758e1aa22132a8fe
 
 ### Added
 * Initial support for `SynExpr.DotLambda` [#2920](https://github.com/fsprojects/fantomas/pull/2920) (See [dotnet/fsharp#13907](https://github.com/dotnet/fsharp/pull/13907))
@@ -12,6 +13,9 @@
 ### Fixed
 * Comment no longer attached to autoproperty. [#2948](https://github.com/fsprojects/fantomas/issues/2948)
 * `begin`/`end` are replaced with parens. [#2368](https://github.com/fsprojects/fantomas/issues/2368)
+* Block comment in Rational between lparen and numerator is moved before lparen. [#2930](https://github.com/fsprojects/fantomas/issues/2930)
+* Block comment in Rational between / and denominator is moved before /. [#2932](https://github.com/fsprojects/fantomas/issues/2932)
+* Block comment in Rational between denominator and rparen is moved behind rparen. [#2933](https://github.com/fsprojects/fantomas/issues/2933)
 
 ## 6.1.3 - 2023-08-25
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 1041ed9299..ea7af583ad 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -39,7 +39,7 @@ Some common use cases include:
     
     <!-- Versions -->
     <PropertyGroup>
-        <FCSCommitHash>d508186f510681d1261291474e3f9f25485999a8</FCSCommitHash>
+        <FCSCommitHash>97a5b6584b54707e3e8541fe758e1aa22132a8fe</FCSCommitHash>
         <StreamJsonRpcVersion>2.8.28</StreamJsonRpcVersion>
         <FSharpCoreVersion>6.0.1</FSharpCoreVersion>
     </PropertyGroup>
diff --git a/src/Fantomas.Core.Tests/SynConstTests.fs b/src/Fantomas.Core.Tests/SynConstTests.fs
index ebb8e0cfc2..e81831918d 100644
--- a/src/Fantomas.Core.Tests/SynConstTests.fs
+++ b/src/Fantomas.Core.Tests/SynConstTests.fs
@@ -846,3 +846,48 @@ let ``block comment between ^ and exponent in SynMeasure.Power is lost, 2936`` (
         """
 234<m^ (* foo *) 2>
 """
+
+[<Test>]
+let ``block comment in Rational between lparen and numerator is moved before lparen, 2930`` () =
+    formatSourceString
+        false
+        """
+234<kg^((* foo *)2/3)>
+"""
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+234<kg^( (* foo *) 2/3)>
+"""
+
+[<Test>]
+let ``block comment in Rational between / and denominator is moved before /, 2932`` () =
+    formatSourceString
+        false
+        """
+234<kg^(2/(* foo *)3)>
+"""
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+234<kg^(2/ (* foo *) 3)>
+"""
+
+[<Test>]
+let ``block comment in Rational between denominator and rparen is moved behind rparen, 2933`` () =
+    formatSourceString
+        false
+        """
+234<kg^(2/3(* foo *))>
+"""
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+234<kg^(2/3 (* foo *) )>
+"""
diff --git a/src/Fantomas.Core/ASTTransformer.fs b/src/Fantomas.Core/ASTTransformer.fs
index dff2b02858..9e5ea201a8 100644
--- a/src/Fantomas.Core/ASTTransformer.fs
+++ b/src/Fantomas.Core/ASTTransformer.fs
@@ -2024,16 +2024,39 @@ let mkSynRationalConst (creationAide: CreationAide) rc =
         | SynRationalConst.Integer(i, range) ->
             stn (creationAide.TextFromSource (fun () -> string i) range) range
             |> RationalConstNode.Integer
-        | SynRationalConst.Rational(numerator, numeratorRange, denominator, denominatorRange, range) ->
+
+        | SynRationalConst.Paren(SynRationalConst.Rational(numerator,
+                                                           numeratorRange,
+                                                           divRange,
+                                                           denominator,
+                                                           denominatorRange,
+                                                           _),
+                                 range) ->
+            let openingParen =
+                let r =
+                    withEnd (Position.mkPos range.Start.Line (range.StartRange.StartColumn + 1)) range.StartRange
+
+                stn "(" r
+
             let n =
                 stn (creationAide.TextFromSource (fun () -> string numerator) numeratorRange) numeratorRange
 
+            let div = stn "/" divRange
+
             let d =
                 stn (creationAide.TextFromSource (fun () -> string denominator) denominatorRange) denominatorRange
 
-            RationalConstNode.Rational(RationalNode(n, d, range))
+            let closingParen =
+                let r =
+                    withStart (Position.mkPos range.End.Line (range.End.Column - 1)) range.EndRange
+
+                stn ")" r
+
+            RationalConstNode.Rational(RationalNode(openingParen, n, div, d, closingParen, range))
+        | SynRationalConst.Paren(innerRc, _) -> visit innerRc
         | SynRationalConst.Negate(innerRc, range) ->
             RationalConstNode.Negate(NegateRationalNode(stn "-" range.StartRange, visit innerRc, range))
+        | SynRationalConst.Rational _ -> failwith "SynRationalConst.Rational not wrapped in SynRationalConst.Paren"
 
     visit rc
 
diff --git a/src/Fantomas.Core/CodePrinter.fs b/src/Fantomas.Core/CodePrinter.fs
index b66bb3798d..80b42ecf8f 100644
--- a/src/Fantomas.Core/CodePrinter.fs
+++ b/src/Fantomas.Core/CodePrinter.fs
@@ -245,11 +245,11 @@ let genRational (rat: RationalConstNode) =
     | RationalConstNode.Integer i -> genSingleTextNode i
     | RationalConstNode.Negate negate -> genSingleTextNode negate.Minus +> genRational negate.Rational
     | RationalConstNode.Rational rationalNode ->
-        genSingleTextNode (SingleTextNode("(", Fantomas.FCS.Text.Range.Zero))
+        genSingleTextNode rationalNode.OpeningParen
         +> genSingleTextNode rationalNode.Numerator
-        +> genSingleTextNode (SingleTextNode("/", Fantomas.FCS.Text.Range.Zero))
+        +> genSingleTextNode rationalNode.DivOp
         +> genSingleTextNode rationalNode.Denominator
-        +> genSingleTextNode (SingleTextNode(")", Fantomas.FCS.Text.Range.Zero))
+        +> genSingleTextNode rationalNode.ClosingParen
         |> genNode rationalNode
 
 let genAttributesCore (ats: AttributeNode list) =
diff --git a/src/Fantomas.Core/SyntaxOak.fs b/src/Fantomas.Core/SyntaxOak.fs
index 2ce749f196..6a962202ad 100644
--- a/src/Fantomas.Core/SyntaxOak.fs
+++ b/src/Fantomas.Core/SyntaxOak.fs
@@ -2834,13 +2834,29 @@ type MeasureParenNode(openingParen: SingleTextNode, measure: Measure, closingPar
     member val Measure = measure
     member val ClosingParen = closingParen
 
-type RationalNode(numerator: SingleTextNode, denominator: SingleTextNode, range: range) =
+type RationalNode
+    (
+        openingParen: SingleTextNode,
+        numerator: SingleTextNode,
+        divOp: SingleTextNode,
+        denominator: SingleTextNode,
+        closingParen: SingleTextNode,
+        range: range
+    ) =
     inherit NodeBase(range)
 
-    override val Children: Node array = [| yield numerator; yield denominator |]
+    override val Children: Node array =
+        [| yield openingParen
+           yield numerator
+           yield divOp
+           yield denominator
+           yield closingParen |]
 
+    member val OpeningParen = openingParen
     member val Numerator = numerator
+    member val DivOp = divOp
     member val Denominator = denominator
+    member val ClosingParen = closingParen
 
 type NegateRationalNode(minus: SingleTextNode, rationalConst: RationalConstNode, range: range) =
     inherit NodeBase(range)