diff --git a/prof.c b/prof.c
index c86202e..dd026fb 100644
--- a/prof.c
+++ b/prof.c
@@ -2876,7 +2876,7 @@ void *hook(char *const restrict dst, char *const restrict src, char unsigned siz
 }
 
 #if defined(UTRACY_WINDOWS)
-#	define BYOND_MAX_BUILD 1642
+#	define BYOND_MAX_BUILD 1643
 #	define BYOND_MIN_BUILD 1543
 #	define BYOND_VERSION_ADJUSTED(a) ((a) - BYOND_MIN_BUILD)
 
@@ -2980,10 +2980,11 @@ static int unsigned const byond_offsets[][9] = {
 	[BYOND_VERSION_ADJUSTED(1640)] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x00050606},
 	[BYOND_VERSION_ADJUSTED(1641)] = {0x00409614, 0x00409618, 0x00409624, 0x00409634, 0x001C002C, 0x00130B20, 0x0020BA10, 0x001C3890, 0x00050606},
 	[BYOND_VERSION_ADJUSTED(1642)] = {0x00409614, 0x00409618, 0x00409624, 0x00409634, 0x001C002C, 0x00130B20, 0x0020BAE0, 0x001C3940, 0x00050606},
+	[BYOND_VERSION_ADJUSTED(1643)] = {0x0040961C, 0x00409620, 0x0040962C, 0x0040963C, 0x001C002C, 0x00130B20, 0x0020BAD0, 0x001C38E0, 0x00050606},
 };
 
 #elif defined(UTRACY_LINUX)
-#	define BYOND_MAX_BUILD 1642
+#	define BYOND_MAX_BUILD 1643
 #	define BYOND_MIN_BUILD 1543
 #	define BYOND_VERSION_ADJUSTED(a) ((a) - BYOND_MIN_BUILD)
 
@@ -3085,6 +3086,7 @@ static int unsigned const byond_offsets[][9] = {
 	[BYOND_VERSION_ADJUSTED(1640)] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x00050505},
 	[BYOND_VERSION_ADJUSTED(1641)] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x00050505},
 	[BYOND_VERSION_ADJUSTED(1642)] = {0x006DB818, 0x006DB81C, 0x006DB830, 0x006DB86C, 0x001C002C, 0x00323000, 0x003105C0, 0x00306FC0, 0x00050505},
+	[BYOND_VERSION_ADJUSTED(1643)] = {0x006DB618, 0x006DB61C, 0x006DB630, 0x006DB66C, 0x001C002C, 0x00322E10, 0x00310430, 0x00306E30, 0x00050505},
 };
 
 #endif
diff --git a/readme.md b/readme.md
index 3801ef9..4532d53 100644
--- a/readme.md
+++ b/readme.md
@@ -4,6 +4,7 @@ byond-tracy glues together a byond server with the tracy profiler allowing you t
 ## supported byond versions
 | windows  | linux    |
 | -------- | -------- |
+| 515.1643 | 515.1643 |
 | 515.1642 | 515.1642 |
 | 515.1641 |          |
 |          |          |