diff --git a/Benchmarks/Benchmarks.csproj b/Benchmarks/Benchmarks.csproj
index 1c2c9f4..f783721 100644
--- a/Benchmarks/Benchmarks.csproj
+++ b/Benchmarks/Benchmarks.csproj
@@ -19,7 +19,7 @@
     <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.13.1" />
     <PackageReference Include="ImmutableTrie" Version="1.0.0-alpha" />
-    <PackageReference Include="ImTools" Version="3.1.0" />
+    <PackageReference Include="ImTools" Version="4.0.0" />
     <PackageReference Include="LRUCache" Version="0.1.0" />
     <PackageReference Include="OptimizedPriorityQueue" Version="5.1.0" />
     <PackageReference Include="Sasa.Collections" Version="1.0.0-RC4" />