diff --git a/.editorconfig b/.editorconfig
index 3b441db9e1..4a25f15793 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -858,6 +858,9 @@ dotnet_diagnostic.CA1858.severity = warning
 # Avoid using 'Enumerable.Any()' extension method.
 dotnet_diagnostic.CA1860.severity = warning
 
+# Prefer the 'IDictionary.TryAdd(TKey, TValue)' method.
+dotnet_diagnostic.CA1864.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
+
 # Cache and reuse 'JsonSerializerOptions' instances.
 dotnet_diagnostic.CA1869.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
 
diff --git a/OpenRA.Mods.Common/Installer/SourceActions/ExtractBlastSourceAction.cs b/OpenRA.Mods.Common/Installer/SourceActions/ExtractBlastSourceAction.cs
index 6bdc76ddf6..3d9ca394ed 100644
--- a/OpenRA.Mods.Common/Installer/SourceActions/ExtractBlastSourceAction.cs
+++ b/OpenRA.Mods.Common/Installer/SourceActions/ExtractBlastSourceAction.cs
@@ -43,8 +43,7 @@ namespace OpenRA.Mods.Common.Installer
 					source.Position += 13;
 
 					// This does not apply on game relevant data.
-					if (!entries.ContainsKey(key))
-						entries.Add(key, entry);
+					entries.TryAdd(key, entry);
 				}
 
 				foreach (var node in actionYaml.Nodes)
diff --git a/OpenRA.Mods.Common/Traits/BotModules/SupportPowerBotModule.cs b/OpenRA.Mods.Common/Traits/BotModules/SupportPowerBotModule.cs
index f247b853b5..a6c3398573 100644
--- a/OpenRA.Mods.Common/Traits/BotModules/SupportPowerBotModule.cs
+++ b/OpenRA.Mods.Common/Traits/BotModules/SupportPowerBotModule.cs
@@ -72,8 +72,7 @@ namespace OpenRA.Mods.Common.Traits
 					continue;
 
 				// Add power to dictionary if not in delay dictionary yet
-				if (!waitingPowers.ContainsKey(sp))
-					waitingPowers.Add(sp, 0);
+				waitingPowers.TryAdd(sp, 0);
 
 				if (waitingPowers[sp] > 0)
 					waitingPowers[sp]--;