diff --git a/azure-pipelines/templates/stages/build.yml b/azure-pipelines/templates/stages/build.yml
index a561b321..b1a55f9a 100644
--- a/azure-pipelines/templates/stages/build.yml
+++ b/azure-pipelines/templates/stages/build.yml
@@ -34,7 +34,7 @@ stages:
           target: linux-arm64
 
         osx-x64:
-          vmImage: macos-latest
+          vmImage: macos-11
           target: osx-x64
 
     pool:
diff --git a/azure-pipelines/templates/stages/test.yml b/azure-pipelines/templates/stages/test.yml
index f9791a67..704bdecc 100644
--- a/azure-pipelines/templates/stages/test.yml
+++ b/azure-pipelines/templates/stages/test.yml
@@ -49,7 +49,7 @@ stages:
 
   - job: TestMacOS
     pool:
-      vmImage: macos-latest
+      vmImage: macos-11
 
     steps:
     - template: ../restore.yml
diff --git a/src/fiskaltrust.Launcher.Common/Configuration/Configuration.cs b/src/fiskaltrust.Launcher.Common/Configuration/Configuration.cs
index 03c90626..84d9127a 100644
--- a/src/fiskaltrust.Launcher.Common/Configuration/Configuration.cs
+++ b/src/fiskaltrust.Launcher.Common/Configuration/Configuration.cs
@@ -197,12 +197,11 @@ public static LauncherConfiguration Deserialize(string text)
             var configuration = JsonSerializer.Deserialize(
                 text,
                 typeof(LauncherConfiguration),
-                new SerializerContext(new JsonSerializerOptions
+                new JsonSerializerOptions
                 {
-                    Converters = {
-                        new JsonStringEnumConverter()
-                    },
-                })
+                    PropertyNameCaseInsensitive = true,
+                    Converters = { new JsonStringEnumConverter() },
+                }
             ) as LauncherConfiguration ?? throw new Exception($"Could not deserialize {nameof(LauncherConfiguration)}");
             configuration.SetAlternateNames(text);
             return configuration;
@@ -339,12 +338,11 @@ public record LauncherConfigurationInCashBoxConfiguration
             var configuration = (JsonSerializer.Deserialize(
                 text,
                 typeof(LauncherConfigurationInCashBoxConfiguration),
-                new SerializerContext(new JsonSerializerOptions
+                new JsonSerializerOptions
                 {
-                    Converters = {
-                        new JsonStringEnumConverter()
-                    }
-                })
+                    PropertyNameCaseInsensitive = true,
+                    Converters = { new JsonStringEnumConverter() },
+                }
             ) as LauncherConfigurationInCashBoxConfiguration ?? throw new Exception($"Could not deserialize {nameof(LauncherConfigurationInCashBoxConfiguration)}")).LauncherConfiguration;
             configuration?.SetAlternateNames(text);
             return configuration;
diff --git a/test/fiskaltrust.Launcher.UnitTest/Configuration/Configuration.cs b/test/fiskaltrust.Launcher.UnitTest/Configuration/Configuration.cs
index b6076319..c6875ab6 100644
--- a/test/fiskaltrust.Launcher.UnitTest/Configuration/Configuration.cs
+++ b/test/fiskaltrust.Launcher.UnitTest/Configuration/Configuration.cs
@@ -47,5 +47,55 @@ public void RandomConfiguration_SerializaAndDeserialize_ShouldPreserveNull()
                 deserialized.Should().BeEquivalentTo(deserialized);
             }
         }
+        
+        [Fact]
+        public void DifferentCaseInKeys_Deserialize_ShouldPreserveProperties()
+        {
+            var json = @"{
+                ""loglevel"": ""Information"",
+                ""LOGLEVEL"": ""Error"",
+                ""LogLevel"": ""Warning""
+            }";
+        
+            var deserialized = LauncherConfiguration.Deserialize(json);
+        
+            deserialized.LogLevel.Should().Be(LogLevel.Warning);
+        }
+        
+        [Fact]
+        public void LowerCaseKeys_Deserialize_ShouldPreserveProperties()
+        {
+            var json = @"{
+                ""loglevel"": ""Information""
+            }";
+        
+            var deserialized = LauncherConfiguration.Deserialize(json);
+        
+            deserialized.LogLevel.Should().Be(LogLevel.Information);
+        }
+        
+        [Fact]
+        public void UpperCaseKeys_Deserialize_ShouldPreserveProperties()
+        {
+            var json = @"{
+                ""LOGLEVEL"": ""Error""
+            }";
+        
+            var deserialized = LauncherConfiguration.Deserialize(json);
+        
+            deserialized.LogLevel.Should().Be(LogLevel.Error);
+        }
+        
+        [Fact]
+        public void MixedCaseKeys_Deserialize_ShouldPreserveProperties()
+        {
+            var json = @"{
+                ""logLevel"": ""Warning""
+            }";
+        
+            var deserialized = LauncherConfiguration.Deserialize(json);
+        
+            deserialized.LogLevel.Should().Be(LogLevel.Warning);
+        }        
     }
 }
\ No newline at end of file