diff --git a/lib/init.luau b/lib/init.luau
index 15fb57e..72432c7 100644
--- a/lib/init.luau
+++ b/lib/init.luau
@@ -164,11 +164,11 @@ export type ParseError =
 
 	Lexicographical ordering for prerelease types
 ]=]
-local PRERELEASE_LEX_ORDER: { [PreleaseType]: number } = {
+local PRERELEASE_LEX_ORDER: { [PreleaseType]: number } = table.freeze({
 	alpha = 1,
 	beta = 2,
 	rc = 3,
-}
+})
 
 --[=[
 	@within Semver