diff --git a/package.yaml b/package.yaml
index 5b98933..6be5919 100644
--- a/package.yaml
+++ b/package.yaml
@@ -32,7 +32,9 @@ ghc-options:
 - -Wpartial-fields
 - -Wredundant-constraints
 - -ddump-splices
-- -XDeriveLift
+
+default-extensions:
+- DeriveLift
 
 library:
   source-dirs: src
diff --git a/si-calculator.cabal b/si-calculator.cabal
index f897ddb..837870a 100644
--- a/si-calculator.cabal
+++ b/si-calculator.cabal
@@ -41,7 +41,9 @@ library
       Paths_si_calculator
   hs-source-dirs:
       src
-  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices -XDeriveLift
+  default-extensions:
+      DeriveLift
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices
   build-depends:
       base >=4.7 && <5
     , containers
@@ -57,7 +59,9 @@ executable si-calculator-exe
       Paths_si_calculator
   hs-source-dirs:
       app
-  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices -XDeriveLift -threaded -rtsopts -with-rtsopts=-N
+  default-extensions:
+      DeriveLift
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.7 && <5
     , directory
@@ -77,7 +81,9 @@ test-suite si-calculator-test
       Paths_si_calculator
   hs-source-dirs:
       test
-  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices -XDeriveLift -threaded -rtsopts -with-rtsopts=-N
+  default-extensions:
+      DeriveLift
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -ddump-splices -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.7 && <5
     , si-calculator