diff --git a/ChangeLog.md b/ChangeLog.md
index 4da6cc7..691e873 100644
--- 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/package.yaml b/package.yaml
index 74431c6..a467a6a 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name:                cobot-io
-version:             0.1.5.4
+version:             0.1.5.5
 github:              "biocad/cobot-io"
 license:             BSD3
 category:            Bio
diff --git a/src/Bio/FASTA/Parser.hs b/src/Bio/FASTA/Parser.hs
index c7bf238..f48ab32 100644
--- a/src/Bio/FASTA/Parser.hs
+++ b/src/Bio/FASTA/Parser.hs
@@ -127,6 +127,7 @@ modificationP
   , 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
index 262d70c..6b66581 100644
--- a/src/Bio/FASTA/Type.hs
+++ b/src/Bio/FASTA/Type.hs
@@ -87,6 +87,7 @@ data Modification
   | Mod_3CholTEG
   | Mod_5C10
   | Mod_5Alk
+  | Mod_5ROX
   | Mod_GC
   | Mod_GT
   | Mod_AT