diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,6 +1,11 @@
 # Changelog for cobot-io
 
 ## [Unreleased]
+## [0.1.5.8] - 2026-10-29
+- Fix Gb prase for unknown char in ACCESSION tag
+
+## [0.1.5.7] - 2026-02-02
+- Update dependencies for GHC 9.10.
 
 ## [0.1.5.6] - 2024-12-18
 - Fix for gb-parser: spaces in name in LOCUS
diff --git a/cobot-io.cabal b/cobot-io.cabal
--- a/cobot-io.cabal
+++ b/cobot-io.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.36.0.
+-- This file has been generated from package.yaml by hpack version 0.39.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           cobot-io
-version:        0.1.5.7
+version:        0.1.5.8
 synopsis:       Biological data file formats and IO
 description:    Please see the README on GitHub at <https://github.com/biocad/cobot-io#readme>
 category:       Bio
@@ -32,6 +32,7 @@
     test/GB/fromYanaWithLove.gb
     test/GB/pAAV-GFP-CellBioLab-dots.gb
     test/GB/pAAV-GFP-CellBioLab.gb
+    test/GB/pAAV-GFP-Unknown_Accession.gb
     test/GB/pAAV_CMV_RPE65_PolyA_linkers.gb
     test/GB/pIntA-TRBV.gb
     test/GB/spaces_in_locus.gb
@@ -241,8 +242,7 @@
       TypeFamilies
   ghc-options: -threaded -rtsopts -with-rtsopts=-N
   build-depends:
-      QuickCheck >=2.9.2 && <2.15
-    , attoparsec >=0.10 && <0.15
+      attoparsec >=0.10 && <0.15
     , base >=4.14 && <5
     , binary >=0.8.3.0 && <1.0
     , bytestring >=0.10.8.1 && <0.13
diff --git a/src/Bio/GB/Parser.hs b/src/Bio/GB/Parser.hs
--- a/src/Bio/GB/Parser.hs
+++ b/src/Bio/GB/Parser.hs
@@ -10,14 +10,15 @@
                                              Source (..), Version (..))
 import           Bio.Sequence               (Border (..), MarkedSequence, Range (..),
                                              RangeBorder (..), markedSequence, shiftRange)
+import           Control.Monad              (join, void)
 import           Control.Monad.Combinators  (many, manyTill, optional, some, (<|>))
 import           Data.Char                  (isAlphaNum, isSpace, isUpper)
 import           Data.Functor               (($>))
 import           Data.Text                  (Text, intercalate, pack, splitOn, unpack)
 import qualified Data.Text                  as T
 import           Text.Megaparsec            (notFollowedBy, option, satisfy, sepBy1, takeWhile1P,
-                                             takeWhileP, try, (<?>))
-import           Text.Megaparsec.Char       (char, digitChar, eol, letterChar, string)
+                                             takeWhileP, try, (<?>), anySingle)
+import           Text.Megaparsec.Char       (char, digitChar, eol, letterChar, string, hspace)
 import           Text.Megaparsec.Char.Lexer (decimal)
 
 -- | Parser of .gb file.
@@ -37,7 +38,7 @@
   locus'      <- locusP <?> "Locus parser"
 
   definitionM <- optional definitionP <?> "Definition parser"
-  accessionM  <- optional accessionP <?> "Accession parser"
+  accessionM  <- join <$> optional accessionP <?> "Accession parser"
   versionM    <- optional versionP <?> "Version parser"
   keywordsM   <- optional keywordsP <?> "Keywords parser"
   sourceM     <- optional sourceP <?> "Source parser"
@@ -67,10 +68,12 @@
 definitionP :: Parser Text
 definitionP =  string "DEFINITION" *> space *> (try emptyP <|> someLinesP)
 
-accessionP :: Parser Text
-accessionP =  string "ACCESSION" *> space *> (try emptyP <|> (pack
-          <$> some (try alphaNumChar <|> char '_')
-          <*  eolSpaceP))
+accessionP :: Parser (Maybe Text)
+accessionP = string "ACCESSION" *> hspace *> (try (Just <$> valueP) <|> (Nothing <$ skipLineP))
+  where
+    valueP = try emptyP
+          <|> (pack <$> some (try alphaNumChar <|> char '_' <|> char '<' <|> char '>') <* eolSpaceP)
+    skipLineP = void (manyTill anySingle eol)
 
 versionP :: Parser Version
 versionP =  string "VERSION" *> space
diff --git a/test/GB/pAAV-GFP-Unknown_Accession.gb b/test/GB/pAAV-GFP-Unknown_Accession.gb
new file mode 100644
--- /dev/null
+++ b/test/GB/pAAV-GFP-Unknown_Accession.gb
@@ -0,0 +1,145 @@
+LOCUS       pAAV-GFP-CellBio        5374 bp ds-DNA     circular SYN 15-AUG-2016
+DEFINITION  Saccharomyces cerevisiae TCP1-beta gene, partial cds, and Axl2p
+            (AXL2) and Rev7p (REV7) genes, complete cds.
+ACCESSION   <unknown
+VERSION     U49845.1  GI:1293613
+KEYWORDS    .
+SOURCE      synthetic DNA construct
+  ORGANISM  synthetic DNA construct
+            synthetic DNA construct hmmm interesting
+REFERENCE   1  (bases 1 to 5374)
+  AUTHORS   avprok
+  TITLE     Direct Submission
+  JOURNAL   Exported Monday, August 15, 2016 from SnapGene 3.1.4 to Vector
+            NTI(R) format
+            http://www.snapgene.com
+REFERENCE   2  (bases 1 to 5028)
+  AUTHORS   Roemer,T., Madden,K., Chang,J. and Snyder,M.
+  TITLE     Selection of axial growth sites in yeast requires Axl2p, a novel
+            plasma membrane glycoprotein
+  JOURNAL   Genes Dev. 10 (7), 777-793 (1996)
+  PUBMED    8846915
+REFERENCE   3  (bases 1 to 5028)
+  AUTHORS   Roemer,T.
+  TITLE     Direct Submission
+  JOURNAL   Submitted (22-FEB-1996) Terry Roemer, Biology, Yale University, New
+            Haven, CT, USA
+COMMENT     VNTDATE|745891200|
+COMMENT     VNTDBDATE|778204800|
+COMMENT     VNTNAME|pAAV-GFP-CellBioLab|
+COMMENT     VNTAUTHORNAME|avprok|
+FEATURES             Location/Qualifiers
+     misc_feature    1..130
+                     /label=Right ITR
+     enhancer        206..509
+                     /label=CMV enhancer
+                     /note="human cytomegalovirus immediate early enhancer"
+     promoter        510..712
+                     /label=CMV promoter
+                     /note="human cytomegalovirus (CMV) immediate early
+                     promoter"
+     misc_feature    805..1297
+                     /label=Human beta-globin Intron
+     CDS             1320..2036
+                     /codon_start=1
+                     /product="enhanced GFP"
+                     /label=EGFP
+                     /note="mammalian codon-optimized"
+     repeat_region   complement(2637..2777)
+                     /label=Left ITR
+                     /note="inverted terminal repeat of adeno-associated virus
+                     serotype 2
+                     oooooo"
+                     /prop=1
+ORIGIN
+        1 cctgcaggca gctgcgcgct cgctcgctca ctgaggccgc ccgggcgtcg ggcgaccttt
+       61 ggtcgcccgg cctcagtgag cgagcgagcg cgcagagagg gagtggccaa ctccatcact
+      121 aggggttcct gcggccgcac gcgtctagtt attaatagta atcaattacg gggtcattag
+      181 ttcatagccc atatatggag ttccgcgtta cataacttac ggtaaatggc ccgcctggct
+      241 gaccgcccaa cgacccccgc ccattgacgt caataatgac gtatgttccc atagtaacgt
+      301 caatagggac tttccattga cgtcaatggg tggagtattt acggtaaact gcccacttgg
+      361 cagtacatca agtgtatcat atgccaagta cgccccctat tgacgtcaat gacggtaaat
+      421 ggcccgcctg gcattatgcc cagtacatga ccttatggga ctttcctact tggcagtaca
+      481 tctacgtatt agtcatcgct attaccatgg tgatgcggtt ttggcagtac atcaatgggc
+      541 gtggatagcg gtttgactca cggggatttc caagtctcca ccccattgac gtcaatggga
+      601 gtttgttttg caccaaaatc aacgggactt tccaaaatgt cgtaacaact ccgccccatt
+      661 gacgcaaatg ggcggtaggc gtgtacggtg ggaggtctat ataagcagag ctcgtttagt
+      721 gaaccgtcag atcgcctgga gacgccatcc acgctgtttt gacctccata gaagacaccg
+      781 ggaccgatcc agcctccgcg gattcgaatc ccggccggga acggtgcatt ggaacgcgga
+      841 ttccccgtgc caagagtgac gtaagtaccg cctatagagt ctataggccc acaaaaaatg
+      901 ctttcttctt ttaatatact tttttgttta tcttatttct aatactttcc ctaatctctt
+      961 tctttcaggg caataatgat acaatgtatc atgcctcttt gcaccattct aaagaataac
+     1021 agtgataatt tctgggttaa ggcaatagca atatttctgc atataaatat ttctgcatat
+     1081 aaattgtaac tgatgtaaga ggtttcatat tgctaatagc agctacaatc cagctaccat
+     1141 tctgctttta ttttatggtt gggataaggc tggattattc tgagtccaag ctaggccctt
+     1201 ttgctaatca tgttcatacc tcttatcttc ctcccacagc tcctgggcaa cgtgctggtc
+     1261 tgtgtgctgg cccatcactt tggcaaagaa ttgggattcg aacatcgatt gaattctgaa
+     1321 tggtgagcaa gggcgaggag ctgttcaccg gggtggtgcc catcctggtc gagctggacg
+     1381 gcgacgtaaa cggccacaag ttcagcgtgt ccggcgaggg cgagggcgat gccacctacg
+     1441 gcaagctgac cctgaagttc atctgcacca ccggcaagct gcccgtgccc tggcccaccc
+     1501 tcgtgaccac cctgacctac ggcgtgcagt gcttcagccg ctaccccgac cacatgaagc
+     1561 agcacgactt cttcaagtcc gccatgcccg aaggctacgt ccaggagcgc accatcttct
+     1621 tcaaggacga cggcaactac aagacccgcg ccgaggtgaa gttcgagggc gacaccctgg
+     1681 tgaaccgcat cgagctgaag ggcatcgact tcaaggagga cggcaacatc ctggggcaca
+     1741 agctggagta caactacaac agccacaacg tctatatcat ggccgacaag cagaagaacg
+     1801 gcatcaaggt gaacttcaag atccgccaca acatcgagga cggcagcgtg cagctcgccg
+     1861 accactacca gcagaacacc cccatcggcg acggccccgt gctgctgccc gacaaccact
+     1921 acctgagcac ccagtccgcc ctgagcaaag accccaacga gaagcgcgat cacatggtcc
+     1981 tgctggagtt cgtgaccgcc gccgggatca ctctcggcat ggacgagctg tacaagtact
+     2041 cagatctcga gctcaagtag ggatcctcta gagtcgacct gcagaagctt gcctcgagca
+     2101 gcgctgctcg agagatctac gggtggcatc cctgtgaccc ctccccagtg cctctcctgg
+     2161 ccctggaagt tgccactcca gtgcccacca gccttgtcct aataaaatta agttgcatca
+     2221 ttttgtctga ctaggtgtcc ttctataata ttatggggtg gaggggggtg gtatggagca
+     2281 aggggcaagt tgggaagaca acctgtaggg cctgcggggt ctattgggaa ccaagctgga
+     2341 gtgcagtggc acaatcttgg ctcactgcaa tctccgcctc ctgggttcaa gcgattctcc
+     2401 tgcctcagcc tcccgagttg ttgggattcc aggcatgcat gaccaggctc agctaatttt
+     2461 tgtttttttg gtagagacgg ggtttcacca tattggccag gctggtctcc aactcctaat
+     2521 ctcaggtgat ctacccacct tggcctccca aattgctggg attacaggcg tgaaccactg
+     2581 ctcccttccc tgtccttctg attttgtagg taaccacgtg cggaccgagc ggccgcagga
+     2641 acccctagtg atggagttgg ccactccctc tctgcgcgct cgctcgctca ctgaggccgg
+     2701 gcgaccaaag gtcgcccgac gcccgggctt tgcccgggcg gcctcagtga gcgagcgagc
+     2761 gcgcagctgc ctgcaggggc gcctgatgcg gtattttctc cttacgcatc tgtgcggtat
+     2821 ttcacaccgc atacgtcaaa gcaaccatag tacgcgccct gtagcggcgc attaagcgcg
+     2881 gcgggtgtgg tggttacgcg cagcgtgacc gctacacttg ccagcgccct agcgcccgct
+     2941 cctttcgctt tcttcccttc ctttctcgcc acgttcgccg gctttccccg tcaagctcta
+     3001 aatcgggggc tccctttagg gttccgattt agtgctttac ggcacctcga ccccaaaaaa
+     3061 cttgatttgg gtgatggttc acgtagtggg ccatcgccct gatagacggt ttttcgccct
+     3121 ttgacgttgg agtccacgtt ctttaatagt ggactcttgt tccaaactgg aacaacactc
+     3181 aaccctatct cgggctattc ttttgattta taagggattt tgccgatttc ggcctattgg
+     3241 ttaaaaaatg agctgattta acaaaaattt aacgcgaatt ttaacaaaat attaacgttt
+     3301 acaattttat ggtgcactct cagtacaatc tgctctgatg ccgcatagtt aagccagccc
+     3361 cgacacccgc caacacccgc tgacgcgccc tgacgggctt gtctgctccc ggcatccgct
+     3421 tacagacaag ctgtgaccgt ctccgggagc tgcatgtgtc agaggttttc accgtcatca
+     3481 ccgaaacgcg cgagacgaaa gggcctcgtg atacgcctat ttttataggt taatgtcatg
+     3541 ataataatgg tttcttagac gtcaggtggc acttttcggg gaaatgtgcg cggaacccct
+     3601 atttgtttat ttttctaaat acattcaaat atgtatccgc tcatgagaca ataaccctga
+     3661 taaatgcttc aataatattg aaaaaggaag agtatgagta ttcaacattt ccgtgtcgcc
+     3721 cttattccct tttttgcggc attttgcctt cctgtttttg ctcacccaga aacgctggtg
+     3781 aaagtaaaag atgctgaaga tcagttgggt gcacgagtgg gttacatcga actggatctc
+     3841 aacagcggta agatccttga gagttttcgc cccgaagaac gttttccaat gatgagcact
+     3901 tttaaagttc tgctatgtgg cgcggtatta tcccgtattg acgccgggca agagcaactc
+     3961 ggtcgccgca tacactattc tcagaatgac ttggttgagt actcaccagt cacagaaaag
+     4021 catcttacgg atggcatgac agtaagagaa ttatgcagtg ctgccataac catgagtgat
+     4081 aacactgcgg ccaacttact tctgacaacg atcggaggac cgaaggagct aaccgctttt
+     4141 ttgcacaaca tgggggatca tgtaactcgc cttgatcgtt gggaaccgga gctgaatgaa
+     4201 gccataccaa acgacgagcg tgacaccacg atgcctgtag caatggcaac aacgttgcgc
+     4261 aaactattaa ctggcgaact acttactcta gcttcccggc aacaattaat agactggatg
+     4321 gaggcggata aagttgcagg accacttctg cgctcggccc ttccggctgg ctggtttatt
+     4381 gctgataaat ctggagccgg tgagcgtggg tctcgcggta tcattgcagc actggggcca
+     4441 gatggtaagc cctcccgtat cgtagttatc tacacgacgg ggagtcaggc aactatggat
+     4501 gaacgaaata gacagatcgc tgagataggt gcctcactga ttaagcattg gtaactgtca
+     4561 gaccaagttt actcatatat actttagatt gatttaaaac ttcattttta atttaaaagg
+     4621 atctaggtga agatcctttt tgataatctc atgaccaaaa tcccttaacg tgagttttcg
+     4681 ttccactgag cgtcagaccc cgtagaaaag atcaaaggat cttcttgaga tccttttttt
+     4741 ctgcgcgtaa tctgctgctt gcaaacaaaa aaaccaccgc taccagcggt ggtttgtttg
+     4801 ccggatcaag agctaccaac tctttttccg aaggtaactg gcttcagcag agcgcagata
+     4861 ccaaatactg tccttctagt gtagccgtag ttaggccacc acttcaagaa ctctgtagca
+     4921 ccgcctacat acctcgctct gctaatcctg ttaccagtgg ctgctgccag tggcgataag
+     4981 tcgtgtctta ccgggttgga ctcaagacga tagttaccgg ataaggcgca gcggtcgggc
+     5041 tgaacggggg gttcgtgcac acagcccagc ttggagcgaa cgacctacac cgaactgaga
+     5101 tacctacagc gtgagctatg agaaagcgcc acgcttcccg aagggagaaa ggcggacagg
+     5161 tatccggtaa gcggcagggt cggaacagga gagcgcacga gggagcttcc agggggaaac
+     5221 gcctggtatc tttatagtcc tgtcgggttt cgccacctct gacttgagcg tcgatttttg
+     5281 tgatgctcgt caggggggcg gagcctatgg aaaaacgcca gcaacgcggc ctttttacgg
+     5341 ttcctggcct tttgctggcc ttttgctcac atgt
+//
diff --git a/test/GBParserSpec.hs b/test/GBParserSpec.hs
--- a/test/GBParserSpec.hs
+++ b/test/GBParserSpec.hs
@@ -21,6 +21,13 @@
     unknownFieldsSpecP "test/GB/pIntA-TRBV.gb"
     baseCountWithSophisticatedRangesAndMultilineFeatures "test/GB/fromYanaWithLove.gb"
     spacesInLocusName "test/GB/spaces_in_locus.gb"
+    unknownAccessionSpecP "test/GB/pAAV-GFP-Unknown_Accession.gb"
+
+unknownAccessionSpecP :: FilePath -> Spec
+unknownAccessionSpecP path = describe "unknownAccession" $ do
+    it "correctly parses meta information" $ do
+        mt <- meta <$> fromFile path
+        accession mt `shouldBe` (Just "<unknown")
 
 rangeTests :: Spec
 rangeTests = describe "Range parser" $ do