diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -40,9 +40,14 @@
 * Fourth version revised A. Fixed issues with wrong parameter for espeak that caused no language specific translation.
 
 ## 0.4.1.1 -- 2021-07-06
-
+ː
 * Fourth version revised B. Fixed spelling and stylistic issues in the documentation. 
 
 ## 0.4.2.0 -- 2021-07-08
 
 * Fourth version revised C. Added filtering possibilities and two generalized functions to the EspeakNG_IPA module.
+
+## 0.4.2.1 -- 2021-07-08
+
+* Fourth version revised D. Fixed issue with wrong character filtering 'ː' (that denotes the prolonged sounds in
+IPA) as ':' (default colon in ACSII).
diff --git a/EspeakNG_IPA.hs b/EspeakNG_IPA.hs
--- a/EspeakNG_IPA.hs
+++ b/EspeakNG_IPA.hs
@@ -24,10 +24,10 @@
 {-# INLINE espeakNG_IPA #-}
 
 {-| Given a language 'String' supported by the espeak-ng or espeak (which one is installed properly, the espeak-ng
-is a preferred one) and the needed text returns the IPA representation filtered of the \'ˈ\' and \':\' characters.
+is a preferred one) and the needed text returns the IPA representation filtered of the \'ˈ\' and \'ː\' characters.
 Is just some wrapper around the espeak functionality. -}
 espeakNG_IPA1 :: String -> String -> IO String
-espeakNG_IPA1 = espeakNG_IPA_G (filter (\x -> x /= 'ˈ' && x /= ':'))
+espeakNG_IPA1 = espeakNG_IPA_G (filter (\x -> x /= 'ˈ' && x /= 'ː'))
 {-# INLINE espeakNG_IPA1 #-}
 
 {-| Given a language 'String' supported by the espeak-ng or espeak (which one is installed properly, the espeak-ng
@@ -37,10 +37,10 @@
 {-# INLINE espeakNG_IPA_ #-}
 
 {-| Given a language 'String' supported by the espeak-ng or espeak (which one is installed properly, the espeak-ng
-is a preferred one) and the needed text prints the IPA representation filtered of the \'ˈ\' and \':\' characters.
+is a preferred one) and the needed text prints the IPA representation filtered of the \'ˈ\' and \'ː\' characters.
 Is just some wrapper around the espeak functionality. -}  
 espeakNG_IPA1_ :: String -> String -> IO ()
-espeakNG_IPA1_ = espeakNG_IPA_G_ (filter (\x -> x /= 'ˈ' && x /= ':'))
+espeakNG_IPA1_ = espeakNG_IPA_G_ (filter (\x -> x /= 'ˈ' && x /= 'ː'))
 {-# INLINE espeakNG_IPA1_ #-}
 
 {-| Given a conversion function that is applied to the resulting 'String' before it is returned, a language
diff --git a/phonetic-languages-simplified-generalized-examples-array.cabal b/phonetic-languages-simplified-generalized-examples-array.cabal
--- a/phonetic-languages-simplified-generalized-examples-array.cabal
+++ b/phonetic-languages-simplified-generalized-examples-array.cabal
@@ -3,7 +3,7 @@
 -- http://haskell.org/cabal/users-guide/
 
 name:                phonetic-languages-simplified-generalized-examples-array
-version:             0.4.2.0
+version:             0.4.2.1
 synopsis:            Helps to create texts with the given phonetic properties (e. g. poetic).
 description:         Is rewritten from the modules of the @phonetic-languages-simplified-examples-array@ package. Can be used not only for Ukrainian, but also for other languages. 
 homepage:            https://hackage.haskell.org/package/phonetic-languages-simplified-generalized-examples-array