diff --git a/hledger-lib/Hledger/Read/Common.hs b/hledger-lib/Hledger/Read/Common.hs
index 9a7eec1ba..10f8302d6 100644
--- a/hledger-lib/Hledger/Read/Common.hs
+++ b/hledger-lib/Hledger/Read/Common.hs
@@ -106,9 +106,6 @@ import Data.Functor.Identity
 import Data.List.Compat
 import Data.List.NonEmpty (NonEmpty(..))
 import Data.Maybe
-#if !(MIN_VERSION_base(4,11,0))
-import Data.Monoid
-#endif
 import qualified Data.Map as M
 import qualified Data.Semigroup as Sem
 import Data.Text (Text)
diff --git a/hledger-lib/Hledger/Read/JournalReader.hs b/hledger-lib/Hledger/Read/JournalReader.hs
index 431a6b373..8345ae690 100644
--- a/hledger-lib/Hledger/Read/JournalReader.hs
+++ b/hledger-lib/Hledger/Read/JournalReader.hs
@@ -78,9 +78,6 @@ import Control.Monad
 import Control.Monad.Except (ExceptT(..), runExceptT, throwError)
 import Control.Monad.State.Strict
 import qualified Data.Map.Strict as M
-#if !(MIN_VERSION_base(4,11,0))
-import Data.Monoid
-#endif
 import Data.Text (Text)
 import Data.String
 import Data.List
diff --git a/hledger-lib/hledger-lib.cabal b/hledger-lib/hledger-lib.cabal
index 5e532afac..9d60fd559 100644
--- a/hledger-lib/hledger-lib.cabal
+++ b/hledger-lib/hledger-lib.cabal
@@ -2,7 +2,7 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 408bc36237e01b4976cc96ca0444f05937bd517efb0ef378e0d1d4aac76b9e56
+-- hash: f08b7ddfe8e3ee85bfdc0af7c7320be85b073578c872a98b23b9c6e5bbbe5650
 
 name:           hledger-lib
 version:        1.9.99
@@ -105,7 +105,7 @@ library
     , ansi-terminal >=0.6.2.3
     , array
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-markup >=0.5.1
     , bytestring
     , cmdargs >=0.10
@@ -200,7 +200,7 @@ test-suite doctests
     , ansi-terminal >=0.6.2.3
     , array
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-markup >=0.5.1
     , bytestring
     , cmdargs >=0.10
@@ -295,7 +295,7 @@ test-suite easytests
     , ansi-terminal >=0.6.2.3
     , array
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-markup >=0.5.1
     , bytestring
     , cmdargs >=0.10
@@ -391,7 +391,7 @@ test-suite hunittests
     , ansi-terminal >=0.6.2.3
     , array
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-markup >=0.5.1
     , bytestring
     , cmdargs >=0.10
diff --git a/hledger-lib/package.yaml b/hledger-lib/package.yaml
index 25e84019c..7e8f507ae 100644
--- a/hledger-lib/package.yaml
+++ b/hledger-lib/package.yaml
@@ -40,7 +40,7 @@ extra-source-files:
 
 dependencies:
 - base >=4.8 && <4.12
-- base-compat >=0.8.1
+- base-compat == 0.10.*
 - ansi-terminal >=0.6.2.3
 - array
 - blaze-markup >=0.5.1
diff --git a/hledger-ui/hledger-ui.cabal b/hledger-ui/hledger-ui.cabal
index b071a0cf5..0b306e9d6 100644
--- a/hledger-ui/hledger-ui.cabal
+++ b/hledger-ui/hledger-ui.cabal
@@ -2,7 +2,7 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 0c78f681a99e0d6cc3ae1ff87b9397afc508292a6c412d00c85b5cdb5607b933
+-- hash: ecf98aad3ab1dc507594bf7da100bfa858c432a4e216023543e699f760a271d1
 
 name:           hledger-ui
 version:        1.9.99
@@ -69,7 +69,7 @@ executable hledger-ui
     , ansi-terminal >=0.6.2.3
     , async
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , cmdargs >=0.8
     , containers
     , data-default
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index cee94c886..5dd93529a 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -45,7 +45,7 @@ dependencies:
  - ansi-terminal >=0.6.2.3
  - async
  - base >=4.8 && <4.12
- - base-compat >=0.8.1
+ - base-compat == 0.10.*
  - cmdargs >=0.8
  - containers
  - data-default
diff --git a/hledger-web/hledger-web.cabal b/hledger-web/hledger-web.cabal
index 73e1045a8..3addb3486 100644
--- a/hledger-web/hledger-web.cabal
+++ b/hledger-web/hledger-web.cabal
@@ -2,7 +2,7 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: c000d351c61aeef057878385c2fbb01b696d20af9137ac2210902ba8de60bfaa
+-- hash: 7307cbaf625ff1863fcf59a405c2f148585b0cc13d02486494e726c5e609eb07
 
 name:           hledger-web
 version:        1.9.99
@@ -144,7 +144,7 @@ library
   build-depends:
       HUnit
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-html
     , blaze-markup
     , bytestring
@@ -195,7 +195,7 @@ executable hledger-web
   build-depends:
       HUnit
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-html
     , blaze-markup
     , bytestring
@@ -254,7 +254,7 @@ test-suite test
   build-depends:
       HUnit
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , blaze-html
     , blaze-markup
     , bytestring
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index 7486e4633..8e4dc9c43 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -65,7 +65,7 @@ dependencies:
 - hledger-lib >=1.9.99 && <2.0
 - hledger >=1.9.99 && <2.0
 - base >=4.8 && <4.12
-- base-compat >=0.8.1
+- base-compat == 0.10.*
 - blaze-html
 - blaze-markup
 - bytestring
diff --git a/hledger/hledger.cabal b/hledger/hledger.cabal
index 838db2d65..77bfe3881 100644
--- a/hledger/hledger.cabal
+++ b/hledger/hledger.cabal
@@ -2,7 +2,7 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 0f0ae8e75569c28e8c5987ba06696f6dbbbfc9334de43851eb1d1420ffc89d5a
+-- hash: c0eb869dc10f744521ca915b20715da6a280e9deb5089d74814f63c8b55c5cd9
 
 name:           hledger
 version:        1.9.99
@@ -116,7 +116,7 @@ library
     , HUnit
     , ansi-terminal >=0.6.2.3
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , bytestring
     , cmdargs >=0.10
     , containers
@@ -168,7 +168,7 @@ executable hledger
     , HUnit
     , ansi-terminal >=0.6.2.3
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , bytestring
     , cmdargs >=0.10
     , containers
@@ -222,7 +222,7 @@ test-suite test
     , HUnit
     , ansi-terminal >=0.6.2.3
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , bytestring
     , cmdargs >=0.10
     , containers
@@ -275,7 +275,7 @@ benchmark bench
     , HUnit
     , ansi-terminal >=0.6.2.3
     , base >=4.8 && <4.12
-    , base-compat >=0.8.1
+    , base-compat ==0.10.*
     , bytestring
     , cmdargs >=0.10
     , containers
diff --git a/hledger/package.yaml b/hledger/package.yaml
index c2cb56235..8139c4056 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -81,7 +81,7 @@ dependencies:
 - hledger-lib >=1.9.99 && <2.0
 - ansi-terminal >=0.6.2.3
 - base >=4.8 && <4.12
-- base-compat >=0.8.1
+- base-compat == 0.10.*
 - bytestring
 - cmdargs >=0.10
 - containers