diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+0.5.1
+=====
+
+* Fix an infinite loop in `decodeUtf8` from `Text` to `ByteString.Lazy`.
+
 0.5
 =====
 
@@ -143,20 +148,20 @@
 0.1.7
 =====
 
-* Exports monadic ``(>>)`` operator by default.
-* Adds ``traceId`` and ``traceShowId`` functions.
-* Exports``reader`` and ``state``  functions by default.
+* Export monadic ``(>>)`` operator by default.
+* Add ``traceId`` and ``traceShowId`` functions.
+* Export``reader`` and ``state``  functions by default.
 * Export lifted ``throwIO`` and ``throwTo`` functions.
 
 0.1.6
 =====
 
-* Adds uncatchable panic exception throwing using Text message.
-* Removes ``printf``
-* Removes ``string-conv`` dependency so Stack build works without ``extra-deps``.
-* Brings ``Callstack`` machinery in for GHC 8.x.
-* Removes ``throw`` and ``assert`` from ``Control.Exception`` exports.
-* Removes ``unsafeShiftL`` and ``unsafeShiftR`` from ``Data.Bits`` exports.
+* Add uncatchable panic exception throwing using Text message.
+* Remove ``printf``
+* Remove ``string-conv`` dependency so Stack build works without ``extra-deps``.
+* Bring ``Callstack`` machinery in for GHC 8.x.
+* Remove ``throw`` and ``assert`` from ``Control.Exception`` exports.
+* Remove ``unsafeShiftL`` and ``unsafeShiftR`` from ``Data.Bits`` exports.
 * Reexport ``throw`` as ``unsafeThrow`` via Unsafe module.
 * Hides all Show class functions. Only the Class itself is exported. Forbids custom instances that are not GHC derived.
 * Export`` encodeUtf8`` and ``decodeUtf8`` functions by default.
diff --git a/src/Conv.hs b/src/Conv.hs
--- a/src/Conv.hs
+++ b/src/Conv.hs
@@ -73,7 +73,7 @@
 
 instance ConvertUtf8 T.Text LB.ByteString where
     encodeUtf8 = LB.fromStrict . T.encodeUtf8
-    decodeUtf8 = decodeUtf8
+    decodeUtf8 = T.decodeUtf8With T.lenientDecode . LB.toStrict
     decodeUtf8Strict = T.decodeUtf8' . LB.toStrict
 
 instance ConvertUtf8 LT.Text LB.ByteString where
diff --git a/universum.cabal b/universum.cabal
--- a/universum.cabal
+++ b/universum.cabal
@@ -1,5 +1,5 @@
 name:                universum
-version:             0.5
+version:             0.5.1
 synopsis:            Custom prelude used in Serokell
 description:         Custom prelude used in Serokell
 homepage:            https://github.com/serokell/universum