diff --git a/src/folding/mapping/lookup.rs b/src/folding/mapping/lookup.rs
index d1204dc4..1f8f0553 100644
--- a/src/folding/mapping/lookup.rs
+++ b/src/folding/mapping/lookup.rs
@@ -3,7 +3,7 @@
 // This source is autogenerated. Do not modify it directly.
 // To make modfications to this code, see `scripts/gen_case_lookups.rb`.
 //
-// Last generated on 2020-12-30 17:16:47 UTC.
+// Last generated on 2021-05-17 14:03:38 UTC.
 //
 // Unicode version:
 // CaseFolding-13.0.0.txt
@@ -15,7 +15,7 @@ use super::{Mapping, Mode};
 #[must_use]
 #[allow(clippy::match_same_arms)]
 #[allow(clippy::too_many_lines)]
-pub fn lookup(c: char, mode: Mode) -> Mapping {
+pub const fn lookup(c: char, mode: Mode) -> Mapping {
     let codepoint = c as u32;
     let char_bytes = codepoint.to_be_bytes();
     let mid_byte = char_bytes[2];
diff --git a/tests/full_fold_exhaustive.rs b/tests/full_fold_exhaustive.rs
index 0e738477..7fde1cb3 100644
--- a/tests/full_fold_exhaustive.rs
+++ b/tests/full_fold_exhaustive.rs
@@ -3,7 +3,7 @@
 // This source is autogenerated. Do not modify it directly.
 // To make modfications to this code, see `scripts/gen_case_lookups.rb`.
 //
-// Last generated on 2020-12-30 17:16:47 UTC.
+// Last generated on 2021-05-17 14:03:38 UTC.
 //
 // Unicode version:
 // CaseFolding-13.0.0.txt
diff --git a/tests/full_turkic_fold_exhaustive.rs b/tests/full_turkic_fold_exhaustive.rs
index ff4f960f..48d60bb4 100644
--- a/tests/full_turkic_fold_exhaustive.rs
+++ b/tests/full_turkic_fold_exhaustive.rs
@@ -3,7 +3,7 @@
 // This source is autogenerated. Do not modify it directly.
 // To make modfications to this code, see `scripts/gen_case_lookups.rb`.
 //
-// Last generated on 2020-12-30 17:16:47 UTC.
+// Last generated on 2021-05-17 14:03:38 UTC.
 //
 // Unicode version:
 // CaseFolding-13.0.0.txt