diff --git a/src/EmailContacts/EmailContacts.csproj b/src/EmailContacts/EmailContacts.csproj
index 217034b..5e73630 100644
--- a/src/EmailContacts/EmailContacts.csproj
+++ b/src/EmailContacts/EmailContacts.csproj
@@ -98,7 +98,7 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="bootstrap" Version="3.3.7" />
+    <PackageReference Include="bootstrap" Version="3.4.1" />
     <PackageReference Include="jQuery" Version="3.2.1" />
     <PackageReference Include="Microsoft.AspNet.Razor" Version="3.2.3" />
     <PackageReference Include="Microsoft.AspNet.WebPages" Version="3.2.3" />