diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+## [0.1.5.5] - 2024-05-16
+- Add `5ROX` modification to Fasta parser.
+
 ## [0.1.5.4] - 2024-05-16
 - Fix Fasta parser for unknown modifications on the end of the line.
 
diff --git a/cobot-io.cabal b/cobot-io.cabal
--- a/cobot-io.cabal
+++ b/cobot-io.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           cobot-io
-version:        0.1.5.4
+version:        0.1.5.5
 synopsis:       Biological data file formats and IO
 description:    Please see the README on GitHub at <https://github.com/biocad/cobot-io#readme>
 category:       Bio
@@ -22,9 +22,8 @@
  || ==9.0.2
  || ==9.2.8
  || ==9.4.8
- || ==9.6.5
- || ==9.8.2
- || ==9.10.1
+ || ==9.6.3
+ || ==9.8.1
 
 extra-source-files:
     README.md
diff --git a/src/Bio/FASTA/Parser.hs b/src/Bio/FASTA/Parser.hs
--- a/src/Bio/FASTA/Parser.hs
+++ b/src/Bio/FASTA/Parser.hs
@@ -127,6 +127,7 @@
   , string "[3CholTEG]" $> Mod_3CholTEG
   , string "[5C10]" $> Mod_5C10
   , string "[5Alk]" $> Mod_5Alk
+  , string "[5ROX]" $> Mod_5ROX
   , string "[GC]" $> Mod_GC
   , string "[GT]" $> Mod_GT
   , string "[AT]" $> Mod_AT
diff --git a/src/Bio/FASTA/Type.hs b/src/Bio/FASTA/Type.hs
--- a/src/Bio/FASTA/Type.hs
+++ b/src/Bio/FASTA/Type.hs
@@ -87,6 +87,7 @@
   | Mod_3CholTEG
   | Mod_5C10
   | Mod_5Alk
+  | Mod_5ROX
   | Mod_GC
   | Mod_GT
   | Mod_AT
@@ -178,6 +179,7 @@
 modificationToString Mod_3CholTEG = "[3CholTEG]"
 modificationToString Mod_5C10     = "[5C10]"
 modificationToString Mod_5Alk     = "[5Alk]"
+modificationToString Mod_5ROX     = "[5ROX]"
 modificationToString Mod_GC       = "[GC]"
 modificationToString Mod_GT       = "[GT]"
 modificationToString Mod_AT       = "[AT]"