diff --git a/indexed-traversable-instances.cabal b/indexed-traversable-instances.cabal
--- a/indexed-traversable-instances.cabal
+++ b/indexed-traversable-instances.cabal
@@ -1,6 +1,6 @@
 cabal-version:      1.12
 name:               indexed-traversable-instances
-version:            0.1.2
+version:            0.1.2.1
 build-type:         Simple
 license:            BSD2
 license-file:       LICENSE
@@ -27,9 +27,11 @@
    || ==9.0.2
    || ==9.2.8
    || ==9.4.8
-   || ==9.6.5
-   || ==9.8.2
+   || ==9.6.6
+   || ==9.8.4
    || ==9.10.1
+   || ==9.12.4
+   || ==9.14.1
 
 source-repository head
   type:     git
@@ -40,7 +42,7 @@
   default-language: Haskell2010
   hs-source-dirs:   src
   build-depends:
-      base                  >=4.12     && <4.21
+      base                  >=4.12     && <4.23
     , indexed-traversable   >=0.1.4    && <0.2
     , OneTuple              >=0.3      && <0.5
     , tagged                >=0.8.6    && <0.9
@@ -70,12 +72,11 @@
     , indexed-traversable
     , indexed-traversable-instances
     , OneTuple
-    , transformers
     , unordered-containers
     , vector
 
   build-depends:
-      QuickCheck            >=2.14.2   && <2.15
-    , quickcheck-instances  >=0.3.29   && <0.4
+      QuickCheck            >=2.14.2   && <2.19
+    , quickcheck-instances  >=0.3.29   && <0.5
     , tasty                 >=1.2.3    && <1.6
-    , tasty-quickcheck      >=0.10.1.1 && <0.11
+    , tasty-quickcheck      >=0.10.1.1 && <0.12
diff --git a/tests/main.hs b/tests/main.hs
--- a/tests/main.hs
+++ b/tests/main.hs
@@ -13,12 +13,14 @@
 import Test.Tasty            (TestTree, defaultMain, testGroup)
 import Test.Tasty.QuickCheck (testProperty)
 
+#if MIN_VERSION_base(4,16,0)
 #if MIN_VERSION_OneTuple(0,4,0)
 import Data.Tuple.Solo     (Solo (MkSolo))
 #else
 import Data.Tuple.Solo     (Solo (Solo))
 #define MkSolo Solo
 #endif
+#endif
 
 import qualified Data.HashMap.Lazy as HM
 import qualified Data.Map          as Map
@@ -50,7 +52,9 @@
     , battery $ mkT (HM.keys :: forall a. HM.HashMap I a -> [I])
     , battery $ mkT (zipWith const [0 ..] . toList :: forall a. Seq.Seq a -> [Int])
     , battery $ mkT $ zipWith const [0 ..] . V.toList
+#if MIN_VERSION_base(4,16,0)
     , battery $ mkT $ \(MkSolo _) -> [()]
+#endif
 #if MIN_VERSION_containers(0,6,3)
     , battery $ mkT IntMap.keys
 #endif