2 files changed, 23 insertions, 1 deletions
diff --git a/src/SMAPI.Toolkit/Serialization/Converters/NonStandardSemanticVersionConverter.cs b/src/SMAPI.Toolkit/Serialization/Converters/NonStandardSemanticVersionConverter.cs
new file mode 100644
index 00000000..6f870bcf
--- /dev/null
+++ b/src/SMAPI.Toolkit/Serialization/Converters/NonStandardSemanticVersionConverter.cs
@@ -0,0 +1,15 @@
+namespace StardewModdingAPI.Toolkit.Serialization.Converters
+{
+    /// <summary>Handles deserialization of <see cref="ISemanticVersion"/>, allowing for non-standard extensions.</summary>
+    internal class NonStandardSemanticVersionConverter : SemanticVersionConverter
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public NonStandardSemanticVersionConverter()
+        {
+            this.AllowNonStandard = true;
+        }
+    }
+}
diff --git a/src/SMAPI.Toolkit/Serialization/Converters/SemanticVersionConverter.cs b/src/SMAPI.Toolkit/Serialization/Converters/SemanticVersionConverter.cs
index e1b9db1d..3604956b 100644
--- a/src/SMAPI.Toolkit/Serialization/Converters/SemanticVersionConverter.cs
+++ b/src/SMAPI.Toolkit/Serialization/Converters/SemanticVersionConverter.cs
@@ -8,6 +8,13 @@ namespace StardewModdingAPI.Toolkit.Serialization.Converters
     internal class SemanticVersionConverter : JsonConverter
     {
         /*********
+        ** Fields
+        *********/
+        /// <summary>Whether to allow non-standard extensions to semantic versioning.</summary>
+        protected bool AllowNonStandard { get; set; }
+
+
+        /*********
         ** Accessors
         *********/
         /// <summary>Get whether this converter can read JSON.</summary>
@@ -78,7 +85,7 @@ namespace StardewModdingAPI.Toolkit.Serialization.Converters
         {
             if (string.IsNullOrWhiteSpace(str))
                 return null;
-            if (!SemanticVersion.TryParse(str, out ISemanticVersion version))
+            if (!SemanticVersion.TryParse(str, allowNonStandard: this.AllowNonStandard, out ISemanticVersion version))
                 throw new SParseException($"Can't parse semantic version from invalid value '{str}', should be formatted like 1.2, 1.2.30, or 1.2.30-beta (path: {path}).");
             return version;
         }