diff --git a/CHANGES b/CHANGES
index 0c75b29..c957921 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,13 @@
 This file describes changes in the orb package.
 
+4.9.1 (2024-08-26)
+  - Require GAP >= 4.12
+  - More hash functions now detect invalid input and return `fail`
+    instead of returning garbage (like hashes of random memory blocks,
+    or the constant 0) or even crashing.
+  - Update build system
+  - Various janitorial changes
+
 4.9.0 (2022-09-26)
   - Validate the output of hash functions in the C implementation,
     and report bad values as errors, instead of crashing or corrupting
diff --git a/PackageInfo.g b/PackageInfo.g
index 69cb7c7..69e8ff3 100644
--- a/PackageInfo.g
+++ b/PackageInfo.g
@@ -7,8 +7,8 @@ SetPackageInfo( rec(
 
 PackageName := "orb",
 Subtitle := "Methods to enumerate orbits",
-Version := "4.9.0",
-Date := "26/09/2022", # dd/mm/yyyy format
+Version := "4.9.1",
+Date := "26/08/2024", # dd/mm/yyyy format
 License := "GPL-3.0-or-later",
 
 ##  Information about authors and maintainers.