diff --git a/ViennaRNAParser.cabal b/ViennaRNAParser.cabal
--- a/ViennaRNAParser.cabal
+++ b/ViennaRNAParser.cabal
@@ -5,7 +5,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.2.2
+version:             1.2.3
 synopsis:            Libary for parsing ViennaRNA package output
 description:         Currently contains parsers and datatypes for: RNAalifold, RNAdistance, RNAcofold, RNAfold, RNAplex, RNAup, RNAz.
 		     .
@@ -30,8 +30,8 @@
 
 source-repository this
   type:     git
-  location: https://github.com/eggzilla/ViennaRNAParser/tree/1.2.2
-  tag:      1.2.2
+  location: https://github.com/eggzilla/ViennaRNAParser/tree/1.2.3
+  tag:      1.2.3
 
 library
   -- Modules exported by the library.
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,4 +1,6 @@
 -*-change-log-*-
+1.2.3 Florian Eggenhofer <florian.eggenhofer@univie.ac.at> 7. July 2015
+	* Added lower case letters to allowed sequence characters
 1.2.2 Florian Eggenhofer <florian.eggenhofer@univie.ac.at> 4. July 2015
         * Added a new module for shared functions between modules
 	* Sequence and alignment entry parsing is now in line with IUPAC
diff --git a/src/Bio/RNAzParser.hs b/src/Bio/RNAzParser.hs
--- a/src/Bio/RNAzParser.hs
+++ b/src/Bio/RNAzParser.hs
@@ -1,3 +1,4 @@
+
 -- | Parse RNAz output
 --   For more information on RNAz consult: <http://www.tbi.univie.ac.at/~wash/RNAz
 module Bio.RNAzParser (
@@ -49,8 +50,7 @@
   _svmDecisionValue <-  parseRNAzDoubleField "SVM decision value:"
   _svmRNAClassProbability <- parseRNAzDoubleField "SVM RNA-class probability:"
   _prediction <- parseRNAzStringField "Prediction:"
-  optional (try (string " WARNING: Mean z-score out of range."))
-  optional (try newline)
+  _ <- optional (try (parseRNAzStringField " WARNING:"))
   newline
   many1 (char '#') 
   newline
diff --git a/src/Bio/ViennaRNAParserLibrary.hs b/src/Bio/ViennaRNAParserLibrary.hs
--- a/src/Bio/ViennaRNAParserLibrary.hs
+++ b/src/Bio/ViennaRNAParserLibrary.hs
@@ -19,13 +19,13 @@
 -- | Parse nucleotide sequence. Allowed letters according to IUPAC
 parseNucleotideSequence :: GenParser Char st String
 parseNucleotideSequence = do
-  nucleotideSequence <- many1 (oneOf "RYSWKMBDHVNATUGCatugc") 
+  nucleotideSequence <- many1 (oneOf "RYSWKMBDHVNATUGCryswkmbdhvnatugc") 
   return $ nucleotideSequence
 
 -- | Parse nucleotide alignment entry. Allowed letters according to IUPAC and commonly used gap characters
 parseNucleotideAlignmentEntry :: GenParser Char st String
 parseNucleotideAlignmentEntry = do
-  entry <- many1 (oneOf "~_-.RYSWKMBDHVNATUGCatugc") 
+  entry <- many1 (oneOf "~_-.RYSWKMBDHVNATUGCryswkmbdhvnatugc") 
   return $ entry
 
 -- | Parse protein amino acid code sequence. Allowed letters according to IUPAC