diff --git a/OpenRA.Mods.Common/UpdateRules/Rules/RemoveYesNo.cs b/OpenRA.Mods.Common/UpdateRules/Rules/RemoveYesNo.cs
new file mode 100644
index 0000000000..b594e24f2c
--- /dev/null
+++ b/OpenRA.Mods.Common/UpdateRules/Rules/RemoveYesNo.cs
@@ -0,0 +1,61 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class RemoveYesNo : UpdateRule
+	{
+		public override string Name { get { return "Remove 'yes' and 'no' in favor of 'true' and 'false'."; } }
+
+		public override string Description
+		{
+			get
+			{
+				return "'Yes' and 'no' are no longer valid values for booleans. " +
+					"Use 'true' and 'false' instead.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			foreach (var traitNode in actorNode.Value.Nodes)
+			{
+				foreach (var n in traitNode.Value.Nodes)
+				{
+					var value = n.NodeValue<string>();
+					if (value == null)
+						continue;
+
+					if (value.ToLowerInvariant() == "yes")
+						n.ReplaceValue("true");
+					else if (value.ToLowerInvariant() == "no")
+						n.ReplaceValue("false");
+				}
+			}
+
+			yield break;
+		}
+
+		bool displayed;
+
+		public override IEnumerable<string> AfterUpdate(ModData modData)
+		{
+			if (displayed)
+				yield break;
+
+			displayed = true;
+			yield return "'Yes' and 'no' have been removed from the mod rules. "
+				+ "Chrome yaml files may need a manual update.";
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
index 5031f54bfd..a0a1203d8f 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdatePath.cs
@@ -136,7 +136,11 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new RemoveMoveIntoWorldFromExit(),
 			}),
 
-			new UpdatePath("playtest-20190825", new UpdateRule[0])
+			new UpdatePath("playtest-20190825", new UpdateRule[]
+			{
+				// Bleed only changes here
+				new RemoveYesNo(),
+			})
 		};
 
 		public static IEnumerable<UpdateRule> FromSource(ObjectCreator objectCreator, string source, bool chain = true)