diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -5,6 +5,12 @@
 ## Unreleased changes
 
 
+## 0.8.3.1
+
+-   Bug fix MC3: Do not change prir and likelihood values for auto-tuned
+    reciprocals temperatures.
+
+
 ## 0.8.3.0
 
 -   Fix auto tuning with MC3 algorithm.
diff --git a/mcmc.cabal b/mcmc.cabal
--- a/mcmc.cabal
+++ b/mcmc.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               mcmc
-version:            0.8.3.0
+version:            0.8.3.1
 synopsis:           Sample from a posterior using Markov chain Monte Carlo
 description:
   Please see the README on GitHub at <https://github.com/dschrempf/mcmc#readme>
diff --git a/src/Mcmc/Algorithm/MC3.hs b/src/Mcmc/Algorithm/MC3.hs
--- a/src/Mcmc/Algorithm/MC3.hs
+++ b/src/Mcmc/Algorithm/MC3.hs
@@ -513,7 +513,7 @@
   return $
     if b == NormalTuningFastProposalsOnly || b == NormalTuningAllProposals
       then a {mc3MHGChains = mhgs'', mc3ReciprocalTemperatures = bs'}
-      else a {mc3MHGChains = mhgs''}
+      else a {mc3MHGChains = mhgs'}
 
 mc3ResetAcceptance :: (ToJSON a) => ResetAcceptance -> MC3 a -> MC3 a
 mc3ResetAcceptance x a = a'