diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index b881875..334bae2 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,7 +1,7 @@
 Release notes
 ==============
 
-### 1.3.10 (2024-05-13)
+### 1.3.11 (2024-05-13)
 
 * Added `string` assertion `BeJsonEquivalentTo`
 * Added `HttpResponseMessage` assertion `HaveStringContentSatisfying`. Note that this is async and therefore not
diff --git a/src/Faqt.Tests/TestUtils.fs b/src/Faqt.Tests/TestUtils.fs
index 7b40fc7..8dbfda3 100644
--- a/src/Faqt.Tests/TestUtils.fs
+++ b/src/Faqt.Tests/TestUtils.fs
@@ -4,7 +4,6 @@ module TestUtils
 open System
 open System.Globalization
 open System.Runtime.CompilerServices
-open System.Threading.Tasks
 open Faqt
 open Faqt.AssertionHelpers
 open Xunit
@@ -23,9 +22,9 @@ let assertExnMsg (msg: string) (f: unit -> 'a) =
     )
 
 
-let assertExnMsgAsync (msg: string) (f: unit -> Task) =
+let assertExnMsgAsync (msg: string) (f: unit -> Async<unit>) =
     task {
-        let! ex = Assert.ThrowsAsync<AssertionFailedException>(f)
+        let! ex = Assert.ThrowsAsync<AssertionFailedException>(f >> Async.StartImmediateAsTask >> (fun t -> upcast t))
 
         Assert.Equal(
             ("\n\n" + msg.ReplaceLineEndings("\n").Trim() + "\n") :> obj, // Cast to obj to force full output
diff --git a/src/Faqt/Faqt.fsproj b/src/Faqt/Faqt.fsproj
index fe64348..0bebf80 100644
--- a/src/Faqt/Faqt.fsproj
+++ b/src/Faqt/Faqt.fsproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>net5.0;net7.0;net8.0</TargetFrameworks>
-    <Version>1.3.10</Version>
+    <Version>1.3.11</Version>
     <Authors>Christer van der Meeren</Authors>
     <Description>A fluent assertion library for F#.</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
diff --git a/src/Faqt/HttpResponseMessageAssertions.fs b/src/Faqt/HttpResponseMessageAssertions.fs
index 9cc6197..225a0c1 100644
--- a/src/Faqt/HttpResponseMessageAssertions.fs
+++ b/src/Faqt/HttpResponseMessageAssertions.fs
@@ -3,7 +3,6 @@
 open System.Net
 open System.Net.Http
 open System.Runtime.CompilerServices
-open System.Threading.Tasks
 open Faqt.AssertionHelpers
 
 
@@ -576,8 +575,8 @@ type HttpResponseMessageAssertions =
             t: Testable<HttpResponseMessage>,
             assertion: string -> 'ignored,
             ?because
-        ) : Task =
-        task {
+        ) : Async<unit> =
+        async {
             use _ = t.Assert(true)
 
             match t.Subject.Content with
@@ -587,7 +586,8 @@ type HttpResponseMessageAssertions =
                     .With("Request", t.Subject.RequestMessage)
                     .Fail(because)
             | content ->
-                let! str = content.ReadAsStringAsync()
+                let! ct = Async.CancellationToken
+                let! str = content.ReadAsStringAsync(ct) |> Async.AwaitTask
 
                 try
                     assertion str |> ignore