diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4ad38dd..0e1057b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,8 +18,11 @@ jobs:
           - { os: ubuntu-20.04, ghc: 9.0.1, cabal: 3.4.0.0 }
           - { os: macos-10.15, ghc: 9.0.1, cabal: 3.4.0.0 }
           - { os: windows-2019, ghc: 9.0.1, cabal: 3.4.0.0 }
-          - { os: ubuntu-20.04, ghc: 8.10.4, cabal: 3.2.0.0 }
-          - { os: ubuntu-20.04, ghc: 8.8.4, cabal: 3.0.0.0 }
+          - { os: ubuntu-20.04, ghc: 8.10.4, cabal: 3.4.0.0 }
+          - { os: ubuntu-20.04, ghc: 8.8.4, cabal: 3.4.0.0 }
+          - { os: ubuntu-20.04, ghc: 8.6.5, cabal: 3.4.0.0 }
+          - { os: ubuntu-20.04, ghc: 8.4.4, cabal: 3.4.0.0 }
+          - { os: ubuntu-20.04, ghc: 8.2.2, cabal: 3.4.0.0 }
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
diff --git a/.gitignore b/.gitignore
index 24689d4..f9aca15 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,8 @@
+/.cabal-sandbox/
+/.ghc.environment*
 /.stack-work/
 /cabal.project.freeze
+/cabal.sandbox.config
 /dist-newstyle/
+/dist/
 /stack.yaml.lock
diff --git a/witch.cabal b/witch.cabal
index 67817f2..eef982c 100644
--- a/witch.cabal
+++ b/witch.cabal
@@ -18,23 +18,30 @@ source-repository head
 
 common basics
   build-depends:
-    , base >= 4.13.0 && < 4.16
-    , bytestring >= 0.10.12 && < 0.11
-    , containers >= 0.6.2 && < 0.7
-    , text >= 1.2.4 && < 1.3
-    , time >= 1.9 && < 1.12
+    , base >= 4.10.0 && < 4.16
+    , bytestring >= 0.10.8 && < 0.12
+    , containers >= 0.5.10 && < 0.7
+    , text >= 1.2.3 && < 1.3
+    , time >= 1.9.1 && < 1.12
   default-language: Haskell2010
   ghc-options:
     -Weverything
     -Wno-all-missed-specialisations
     -Wno-implicit-prelude
-    -Wno-missing-deriving-strategies
-    -Wno-missing-export-lists
+    -Wno-missed-specialisations
     -Wno-missing-exported-signatures
     -Wno-redundant-constraints
     -Wno-safe
     -Wno-unsafe
 
+  if impl(ghc >= 8.4)
+    ghc-options:
+      -Wno-missing-export-lists
+
+  if impl(ghc >= 8.8)
+    ghc-options:
+      -Wno-missing-deriving-strategies
+
   if impl(ghc >= 8.10)
     ghc-options:
       -Wno-missing-safe-haskell-mode
@@ -44,7 +51,7 @@ library
   import: basics
 
   build-depends:
-    , template-haskell >= 2.15.0 && < 2.18
+    , template-haskell >= 2.12.0 && < 2.18
   exposed-modules:
     Witch
     Witch.From