diff --git a/biomes.h b/biomes.h
index 0150548..eaf85ff 100644
--- a/biomes.h
+++ b/biomes.h
@@ -33,7 +33,7 @@ enum MCVersion
     MC_1_19_4, MC_1_19 = MC_1_19_4,
     MC_1_20_6, MC_1_20 = MC_1_20_6,
     MC_1_21_1,
-    MC_1_21_2, // = 1.21.3
+    MC_1_21_3,
     MC_1_21_WD, // Winter Drop, version TBA
     MC_1_21 = MC_1_21_WD,
     MC_NEWEST = MC_1_21,
diff --git a/finders.c b/finders.c
index b1a7a08..783d5ec 100644
--- a/finders.c
+++ b/finders.c
@@ -967,7 +967,7 @@ uint64_t calcFitness(const Generator *g, int x, int z)
     // apply dependence on distance from origin
     a = (int64_t)x*x;
     b = (int64_t)z*z;
-    if (g->mc < MC_1_21_2)
+    if (g->mc <= MC_1_21_1)
     {
         double s = (double)(a + b) / (2500 * 2500);
         q = (uint64_t)(s*s * 1e8) + ds;
@@ -5508,7 +5508,7 @@ const int *getBiomeParaLimits(int mc, int id)
     if (mc <= MC_1_17)
         return NULL;
     int i;
-    if (mc > MC_1_21_2)
+    if (mc > MC_1_21_3)
     {
         for (i = 0; g_biome_para_range_21wd_diff[i][0] != -1; i++)
         {
diff --git a/util.c b/util.c
index b7c6685..18fa7a7 100644
--- a/util.c
+++ b/util.c
@@ -74,7 +74,7 @@ const char* mc2str(int mc)
     case MC_1_19:   return "1.19"; break;
     case MC_1_20:   return "1.20"; break;
     case MC_1_21_1: return "1.21.1"; break;
-    case MC_1_21_2: return "1.21.2"; break;
+    case MC_1_21_3: return "1.21.3"; break;
     case MC_1_21_WD: return "1.21 WD"; break;
     default:        return "?";
     }
@@ -84,7 +84,8 @@ int str2mc(const char *s)
 {
     if (!strcmp(s, "1.21"))     return MC_1_21;
     if (!strcmp(s, "1.21 WD"))  return MC_1_21_WD;
-    if (!strcmp(s, "1.21.2"))   return MC_1_21_2;
+    if (!strcmp(s, "1.21.3"))   return MC_1_21_3;
+    if (!strcmp(s, "1.21.2"))   return MC_1_21_3; // backwards compatibility
     if (!strcmp(s, "1.21.1"))   return MC_1_21_1;
     if (!strcmp(s, "1.20"))     return MC_1_20;
     if (!strcmp(s, "1.20.6"))   return MC_1_20_6;