diff --git a/BTCPayServer.Tests/BTCPayServer.Tests.csproj b/BTCPayServer.Tests/BTCPayServer.Tests.csproj
index b717e0bfc..6570a680c 100644
--- a/BTCPayServer.Tests/BTCPayServer.Tests.csproj
+++ b/BTCPayServer.Tests/BTCPayServer.Tests.csproj
@@ -5,6 +5,7 @@
 
     <IsPackable>false</IsPackable>
     <NoWarn>NU1701,CA1816,CA1308,CA1810,CA2208</NoWarn>
+    <LangVersion>7.2</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/BTCPayServer.Tests/UnitTest1.cs b/BTCPayServer.Tests/UnitTest1.cs
index 74e0adb09..631a3503e 100644
--- a/BTCPayServer.Tests/UnitTest1.cs
+++ b/BTCPayServer.Tests/UnitTest1.cs
@@ -321,7 +321,7 @@ namespace BTCPayServer.Tests
         [Fact]
         public void RoundupCurrenciesCorrectly()
         {
-            foreach(var test in new[] 
+            foreach (var test in new[]
             {
                 (0.0005m, "$0.0005 (USD)"),
                 (0.001m, "$0.001 (USD)"),
diff --git a/BTCPayServer.Tests/docker-compose.yml b/BTCPayServer.Tests/docker-compose.yml
index b12b8c10b..01928a9ed 100644
--- a/BTCPayServer.Tests/docker-compose.yml
+++ b/BTCPayServer.Tests/docker-compose.yml
@@ -89,7 +89,7 @@ services:
       - "bitcoin_datadir:/data"
 
   customer_lightningd:
-    image: nicolasdorier/clightning:0.0.0.20-dev
+    image: nicolasdorier/clightning:0.0.0.21-dev
     environment: 
       EXPOSE_TCP: "true"
       LIGHTNINGD_OPT: |
@@ -131,7 +131,7 @@ services:
       - merchant_lightningd
 
   merchant_lightningd:
-    image: nicolasdorier/clightning:0.0.0.20-dev
+    image: nicolasdorier/clightning:0.0.0.21-dev
     environment: 
       EXPOSE_TCP: "true"
       LIGHTNINGD_OPT: |