diff --git a/aoc2025/Node.newt b/aoc2025/Node.newt
index dc108a2..099192e 100644
--- a/aoc2025/Node.newt
+++ b/aoc2025/Node.newt
@@ -22,9 +22,8 @@ instance Applicative Promise where
 instance HasIO Promise where
   liftIO = promise_lift
 
-pfunc fs : JSObject := `require('fs')`
 pfunc getArgs : List String := `arrayToList(String, process.argv)`
-pfunc readFile uses (MkIORes) : (fn : String) -> IO String := `(fn) => (w) => Prelude_MkIORes(require('fs').readFileSync(fn, 'utf8'), w)`
+pfunc readFile uses (MkIORes) : (fn : String) -> IO String := `(fn) => (w) => Prelude_MkIORes(fs.readFileSync(fn, 'utf8'), w)`
 
 pfunc runPromise uses (MkIORes MkUnit) : ∀ a. Promise a → IO Unit := `(a,p) => (w) => {
   // p(w)
diff --git a/src/Prelude.newt b/src/Prelude.newt
index 185e378..91c4c4d 100644
--- a/src/Prelude.newt
+++ b/src/Prelude.newt
@@ -901,7 +901,7 @@ isDigit '9' = True
 isDigit _ = False
 
 isUpper : Char → Bool
-isUpper c = let o = ord c in 64 < o && o < 91
+isUpper c = let o = ord c in (64 < o && o < 91) || (912 < o && o < 938)
 
 isAlphaNum : Char → Bool
 isAlphaNum c = let o = ord c in