Index: build/Source.targets
===================================================================
diff -u -r9155f30558f9f75a53b7f762e45bc43e72c434a9 -rb89fa34f3255cebfe3d36d9f8d2a917a8e5f81c3
--- build/Source.targets	(.../Source.targets)	(revision 9155f30558f9f75a53b7f762e45bc43e72c434a9)
+++ build/Source.targets	(.../Source.targets)	(revision b89fa34f3255cebfe3d36d9f8d2a917a8e5f81c3)
@@ -6,7 +6,7 @@
     <PlatformTarget>x86</PlatformTarget>
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
     <TargetFramework>net45</TargetFramework>
-    <LangVersion>6.0</LangVersion>
+    <LangVersion>7.0</LangVersion>
     <FileAlignment>512</FileAlignment>
     <Company>Deltares</Company>
     <Copyright>Copyright © Deltares 2020</Copyright>