diff --git a/COPYING b/COPYING
index 0bc21f4..86fad49 100644
--- a/COPYING
+++ b/COPYING
@@ -1,4 +1,4 @@
-  Copyright (C) 2000-2020 PMSF IT Consulting Pierre R. Mai
+  Copyright (C) 2000-2023 PMSF IT Consulting Pierre R. Mai
 
   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
diff --git a/NEWS b/NEWS
index 507bc9b..dd9d6e8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+Release 1.0.4
+=============
+
+ * Make dynamic huffman table decoding more robust against out of bounds
+   distance entries, based on a PR from @se-mz.
+ * Detect invalid distance codes 30/31, for symmetrical treatment of
+   invalid length and distance codes.
+ * Revamp gzip header decoding to allow for checking of optional FHCRC
+   CRC16 header checksum when checksum checking is enabled.
+ * Improve optimize declarations, especially for LispWorks performance.
+ * Remove no longer needed muffle annotations for SBCL.
+
 Release 1.0.3
 =============
 
diff --git a/deflate.asd b/deflate.asd
index de7f5a3..9a103fc 100644
--- a/deflate.asd
+++ b/deflate.asd
@@ -1,6 +1,6 @@
 ;;;; Deflate --- RFC 1951 Deflate Decompression
 ;;;;
-;;;; Copyright (C) 2000-2020 PMSF IT Consulting Pierre R. Mai.
+;;;; Copyright (C) 2000-2023 PMSF IT Consulting Pierre R. Mai.
 ;;;;
 ;;;; Permission is hereby granted, free of charge, to any person obtaining
 ;;;; a copy of this software and associated documentation files (the
@@ -42,5 +42,5 @@
   :author "Pierre R. Mai <pmai@pmsf.de>"
   :maintainer "Pierre R. Mai <pmai@pmsf.de>"
   :licence "MIT/X11"
-  :version "1.0.3"
+  :version "1.0.4"
   :components ((:file "deflate")))
diff --git a/deflate.lisp b/deflate.lisp
index a647411..bb7174d 100644
--- a/deflate.lisp
+++ b/deflate.lisp
@@ -1,6 +1,6 @@
 ;;;; Deflate --- RFC 1951 Deflate Decompression
 ;;;;
-;;;; Copyright (C) 2000-2020 PMSF IT Consulting Pierre R. Mai.
+;;;; Copyright (C) 2000-2023 PMSF IT Consulting Pierre R. Mai.
 ;;;;
 ;;;; Permission is hereby granted, free of charge, to any person obtaining
 ;;;; a copy of this software and associated documentation files (the