diff --git a/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs b/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs
index b64d860417..f37479f84a 100644
--- a/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs
+++ b/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs
@@ -25,6 +25,8 @@ namespace osu.Game.Rulesets.Catch.Difficulty
 
         private float halfCatcherWidth;
 
+        public override int Version => 20220701;
+
         public CatchDifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
             : base(ruleset, beatmap)
         {
diff --git a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs
index 178094476f..5d30d33190 100644
--- a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs
+++ b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs
@@ -31,6 +31,8 @@ namespace osu.Game.Rulesets.Mania.Difficulty
         private readonly bool isForCurrentRuleset;
         private readonly double originalOverallDifficulty;
 
+        public override int Version => 20220701;
+
         public ManiaDifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
             : base(ruleset, beatmap)
         {
diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
index 75d9469da3..9f4a405113 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
@@ -25,6 +25,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
         private const double difficulty_multiplier = 0.0675;
         private double hitWindowGreat;
 
+        public override int Version => 20220701;
+
         public OsuDifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
             : base(ruleset, beatmap)
         {
diff --git a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs
index 228856cbe9..9267d1ee3c 100644
--- a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs
+++ b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs
@@ -26,6 +26,8 @@ namespace osu.Game.Rulesets.Taiko.Difficulty
         private const double colour_skill_multiplier = 0.01;
         private const double stamina_skill_multiplier = 0.021;
 
+        public override int Version => 20220701;
+
         public TaikoDifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
             : base(ruleset, beatmap)
         {
diff --git a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
index 9c58a53b97..8dd1b51cae 100644
--- a/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
+++ b/osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
@@ -34,6 +34,11 @@ namespace osu.Game.Rulesets.Difficulty
         private readonly IRulesetInfo ruleset;
         private readonly IWorkingBeatmap beatmap;
 
+        /// <summary>
+        /// A yymmdd version which is used to discern when reprocessing is required.
+        /// </summary>
+        public virtual int Version => 0;
+
         protected DifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
         {
             this.ruleset = ruleset;