diff --git a/src/NaCl.Core/NaCl.Core.csproj b/src/NaCl.Core/NaCl.Core.csproj
index 3131f19..ad23975 100644
--- a/src/NaCl.Core/NaCl.Core.csproj
+++ b/src/NaCl.Core/NaCl.Core.csproj
@@ -54,12 +54,12 @@
   </ItemGroup>
 
   <ItemGroup Label="Package References for Windows" Condition="$(TargetFramework) == 'netstandard2.0' OR $(TargetFramework) == 'net48' OR $(TargetFramework) == 'net481'">
-    <PackageReference Include="IndexRange" Version="1.0.3" />
+    <PackageReference Include="IndexRange" Version="1.1.1" />
     <PackageReference Include="System.Memory" Version="4.6.3" />
   </ItemGroup>
 
   <ItemGroup Label="Package References for Windows" Condition="$(TargetFramework) == 'net45'">
-    <PackageReference Include="IndexRange" Version="1.0.3" />
+    <PackageReference Include="IndexRange" Version="1.1.1" />
     <PackageReference Include="System.Memory" Version="4.5.5" />
   </ItemGroup>