diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+## [0.1.3.20] - 2021-06-04
+### Changed 
+- YLAB2-629: Fasta parser is now able to parse empty lines in the beginning. 
+
 ## [0.1.3.19] - 2021-04-30
 ### Changed 
 - Exports and instances for Biosset. 
diff --git a/cobot-io.cabal b/cobot-io.cabal
--- a/cobot-io.cabal
+++ b/cobot-io.cabal
@@ -1,13 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.33.0.
+-- This file has been generated from package.yaml by hpack version 0.34.4.
 --
 -- see: https://github.com/sol/hpack
---
--- hash: 543c70618887552cd7833594bf0cb48d233a34c25568ca9cd5ddcf6a3914a5c5
 
 name:           cobot-io
-version:        0.1.3.19
+version:        0.1.3.20
 synopsis:       Biological data file formats and IO
 description:    Please see the README on GitHub at <https://github.com/biocad/cobot-io#readme>
 category:       Bio
@@ -75,17 +73,34 @@
       Paths_cobot_io
   hs-source-dirs:
       src
-  default-extensions: DeriveGeneric DeriveFunctor DeriveFoldable DeriveAnyClass FlexibleInstances InstanceSigs MultiParamTypeClasses RecordWildCards ScopedTypeVariables OverloadedStrings TypeApplications TypeFamilies DataKinds ConstraintKinds TypeOperators TemplateHaskell FlexibleContexts
+  default-extensions:
+      DeriveGeneric
+      DeriveFunctor
+      DeriveFoldable
+      DeriveAnyClass
+      FlexibleInstances
+      InstanceSigs
+      MultiParamTypeClasses
+      RecordWildCards
+      ScopedTypeVariables
+      OverloadedStrings
+      TypeApplications
+      TypeFamilies
+      DataKinds
+      ConstraintKinds
+      TypeOperators
+      TemplateHaskell
+      FlexibleContexts
   build-depends:
-      array >=0.5 && <0.6
+      array ==0.5.*
     , attoparsec >=0.10 && <0.14
     , base >=4.7 && <5
     , binary >=0.8.3.0 && <1.0
     , bytestring >=0.10.8.1 && <0.11
     , containers >=0.5.7.1 && <0.7
     , data-msgpack >=0.0.9 && <0.1
-    , deepseq >=1.4 && <1.5
-    , http-conduit >=2.3 && <2.4
+    , deepseq ==1.4.*
+    , http-conduit ==2.3.*
     , hyraxAbif >=0.2.3.15 && <0.2.4.0
     , lens >=4.16 && <5.0
     , linear >=1.20 && <1.22
@@ -117,11 +132,13 @@
       Paths_cobot_io
   hs-source-dirs:
       test
-  default-extensions: OverloadedStrings TypeFamilies
+  default-extensions:
+      OverloadedStrings
+      TypeFamilies
   ghc-options: -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       QuickCheck >=2.9.2 && <2.15
-    , array >=0.5 && <0.6
+    , array ==0.5.*
     , attoparsec >=0.10 && <0.14
     , base >=4.7 && <5
     , binary >=0.8.3.0 && <1.0
@@ -129,10 +146,10 @@
     , cobot-io
     , containers >=0.5.7.1 && <0.7
     , data-msgpack >=0.0.9 && <0.1
-    , deepseq >=1.4 && <1.5
+    , deepseq ==1.4.*
     , directory
     , hspec >=2.4.1 && <2.8
-    , http-conduit >=2.3 && <2.4
+    , http-conduit ==2.3.*
     , hyraxAbif >=0.2.3.15 && <0.2.4.0
     , lens >=4.16 && <5.0
     , linear
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
@@ -12,7 +12,7 @@
 import Bio.Sequence         (BareSequence, bareSequence)
 import Control.Applicative  ((<|>))
 import Data.Attoparsec.Text (Parser, char, choice, endOfInput, endOfLine, many', many1', satisfy,
-                             skipWhile, string, takeWhile, try)
+                             skipWhile, space, string, takeWhile, try)
 import Data.Char            (isAlphaNum, isLetter, isSpace)
 import Data.Text            (Text, strip)
 import Prelude              hiding (takeWhile)
@@ -27,7 +27,7 @@
 -- | Parser of .fasta file.
 --
 fastaP :: ParsableFastaToken a => Parser (Fasta a)
-fastaP = fastaPGeneric isLetter
+fastaP = many' space *> fastaPGeneric isLetter
 
 fastaPGeneric :: ParsableFastaToken a => (Char -> Bool) -> Parser (Fasta a)
 fastaPGeneric = many' . item