diff --git a/ouroboros-consensus-cardano/app/DBAnalyser/Parsers.hs b/ouroboros-consensus-cardano/app/DBAnalyser/Parsers.hs
index 66d1ec176a..73f734af99 100644
--- a/ouroboros-consensus-cardano/app/DBAnalyser/Parsers.hs
+++ b/ouroboros-consensus-cardano/app/DBAnalyser/Parsers.hs
@@ -82,7 +82,7 @@ parseValidationPolicy =
         _                          -> Nothing
 
 parseAnalysis :: Parser AnalysisName
-parseAnalysis = asum [
+parseAnalysis = Foldable.asum [
       flag' ShowSlotBlockNo $ mconcat [
           long "show-slot-block-no"
         , help "Show slot and block number and hash of all blocks"
@@ -150,7 +150,7 @@ checkNoThunksParser = CheckNoThunksEvery <$> option auto
   <> help "Check the ledger state for thunks every n blocks" )
 
 parseLimit :: Parser Limit
-parseLimit = asum [
+parseLimit = Foldable.asum [
     Limit <$> option auto (mconcat [
         long "num-blocks-to-process"
       , help "Maximum number of blocks we want to process"
@@ -244,7 +244,7 @@ parseShelleyArgs = ShelleyBlockArgs
           , help "Path to config file"
           , metavar "PATH"
           ])
-    <*> asum [ Nonce  <$> parseNonce
+    <*> Foldable.asum [ Nonce  <$> parseNonce
              , pure NeutralNonce]
   where
     parseNonce = strOption (mconcat [
diff --git a/ouroboros-consensus-cardano/src/ouroboros-consensus-cardano/Ouroboros/Consensus/Cardano/Ledger.hs b/ouroboros-consensus-cardano/src/ouroboros-consensus-cardano/Ouroboros/Consensus/Cardano/Ledger.hs
index b8d8842093..fe3439acd0 100644
--- a/ouroboros-consensus-cardano/src/ouroboros-consensus-cardano/Ouroboros/Consensus/Cardano/Ledger.hs
+++ b/ouroboros-consensus-cardano/src/ouroboros-consensus-cardano/Ouroboros/Consensus/Cardano/Ledger.hs
@@ -19,6 +19,13 @@
 
 {-# OPTIONS_GHC -Wno-orphans #-}
 
+#if __GLASGOW_HASKELL__ <= 906
+{-# OPTIONS_GHC -Wno-incomplete-patterns
+                -Wno-incomplete-uni-patterns
+                -Wno-incomplete-record-updates
+                -Wno-overlapping-patterns #-}
+#endif
+
 module Ouroboros.Consensus.Cardano.Ledger (
     CardanoTxOut (..)
   , eliminateCardanoTxOut
diff --git a/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Ledger.hs b/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Ledger.hs
index 60bf842f74..9810cea5b9 100644
--- a/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Ledger.hs
+++ b/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Ledger.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DeriveGeneric #-}
@@ -18,6 +19,12 @@
 {-# LANGUAGE UndecidableInstances #-}
 
 {-# OPTIONS_GHC -Wno-orphans #-}
+#if __GLASGOW_HASKELL__ <= 906
+{-# OPTIONS_GHC -Wno-incomplete-patterns
+                -Wno-incomplete-uni-patterns
+                -Wno-incomplete-record-updates
+                -Wno-overlapping-patterns #-}
+#endif
 
 module Ouroboros.Consensus.Shelley.Ledger.Ledger (
     LedgerState (..)
diff --git a/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Query.hs b/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Query.hs
index eb6ce1563e..1e2e80c172 100644
--- a/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Query.hs
+++ b/ouroboros-consensus-cardano/src/shelley/Ouroboros/Consensus/Shelley/Ledger/Query.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveGeneric #-}
@@ -19,6 +20,12 @@
 {-# LANGUAGE UndecidableInstances #-}
 
 {-# OPTIONS_GHC -Wno-orphans #-}
+#if __GLASGOW_HASKELL__ <= 906
+{-# OPTIONS_GHC -Wno-incomplete-patterns
+                -Wno-incomplete-uni-patterns
+                -Wno-incomplete-record-updates
+                -Wno-overlapping-patterns #-}
+#endif
 
 module Ouroboros.Consensus.Shelley.Ledger.Query (
     BlockQuery (..)
diff --git a/ouroboros-consensus/test/consensus-test/Test/Consensus/Mempool/Fairness/TestBlock.hs b/ouroboros-consensus/test/consensus-test/Test/Consensus/Mempool/Fairness/TestBlock.hs
index 4cb332b426..c0d64115f7 100644
--- a/ouroboros-consensus/test/consensus-test/Test/Consensus/Mempool/Fairness/TestBlock.hs
+++ b/ouroboros-consensus/test/consensus-test/Test/Consensus/Mempool/Fairness/TestBlock.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DerivingStrategies #-}