diff --git a/common.c b/common.c
index b887135..43b9bfb 100644
--- a/common.c
+++ b/common.c
@@ -475,31 +475,6 @@ fail:
 
 // --- To be moved to liberty --------------------------------------------------
 
-static bool
-isalpha_ascii (int c)
-{
-	c &= ~32;
-	return c >= 'A' && c <= 'Z';
-}
-
-static bool
-isdigit_ascii (int c)
-{
-	return c >= '0' && c <= '9';
-}
-
-static bool
-isalnum_ascii (int c)
-{
-	return isalpha_ascii (c) || isdigit_ascii (c);
-}
-
-static int
-toupper_ascii (int c)
-{
-	return c >= 'A' && c <= 'Z' ? c : c - ('a' - 'A');
-}
-
 static void
 split_str (const char *s, char delimiter, struct str_vector *out)
 {
diff --git a/liberty b/liberty
index 8c6d187..37005cc 160000
--- a/liberty
+++ b/liberty
@@ -1 +1 @@
-Subproject commit 8c6d18757d2d4135963f3dbab6d2d5ec8c8b6af3
+Subproject commit 37005cc443d8725a0103fdd4ded0b1d38853ef42