diff --git a/async-refresh-tokens.cabal b/async-refresh-tokens.cabal
--- a/async-refresh-tokens.cabal
+++ b/async-refresh-tokens.cabal
@@ -3,7 +3,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           async-refresh-tokens
-version:        0.3.0.0
+version:        0.3.0.1
 synopsis:       Package implementing core logic for refreshing of expiring access tokens
 description:    This package can be used for renewal of expiring access tokens according to user-provided actions. Tokens will be stored in a transactional variable (TVar).
 category:       Control
diff --git a/src/Control/Concurrent/Async/Refresh/Tokens.hs b/src/Control/Concurrent/Async/Refresh/Tokens.hs
--- a/src/Control/Concurrent/Async/Refresh/Tokens.hs
+++ b/src/Control/Concurrent/Async/Refresh/Tokens.hs
@@ -94,8 +94,15 @@
 tokenStoreCallback _ (Left exn) =
   logErrorN $ sformat ("Token refresh action failed: " % stext) (tshow exn)
 tokenStoreCallback store res@(Right t) = do
-  logDebugN $ sformat ("Token refresh action succeeded: " % stext) (tshow t)
+  logDebugN $
+    sformat ("Token refresh action succeeded: " % stext) (tshow (maskRefreshResult t))
   atomically $ writeTVar store (refreshResult <$> res)
+
+maskRefreshResult :: RefreshResult (Token t) -> RefreshResult (Token t)
+maskRefreshResult res = res { refreshResult = maskedToken }
+
+maskedToken :: Token t
+maskedToken = Token { unToken = "XXXXXXXXXXXXXXXX" }
 
 -- | Create a new empty token store for the provided token type.
 newEmptyTokenStore :: (MonadIO m, IsToken t)