diff --git a/json-spec.cabal b/json-spec.cabal
--- a/json-spec.cabal
+++ b/json-spec.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                json-spec
-version:             0.2.1.1
+version:             0.2.1.2
 synopsis:            Type-level JSON specification
 maintainer:          rick@owensmurray.com
 description:         = Motivation
@@ -116,13 +116,13 @@
 
 common dependencies
   build-depends:
-    , aeson      >= 2.1.0.0  && < 2.3
-    , base       >= 4.17.1.0 && < 4.18
-    , containers >= 0.6.7    && < 0.7
+    , aeson      >= 2.0.3.0  && < 2.3
+    , base       >= 4.15.0.0 && < 4.20
+    , containers >= 0.6.4.1  && < 0.7
     , scientific >= 0.3.7.0  && < 0.4
-    , text       >= 2.0.2    && < 2.1
-    , time       >= 1.12.2   && < 1.13
-    , vector     >= 0.13.0.0 && < 0.14
+    , text       >= 1.2.5.0  && < 2.2
+    , time       >= 1.9.3    && < 1.13
+    , vector     >= 0.12.3.1 && < 0.14
 
 common warnings
   ghc-options:
@@ -152,5 +152,5 @@
   default-language: Haskell2010
   build-depends:
     , json-spec
-    , bytestring >= 0.11.4.0 && < 0.12
-    , hspec      >= 2.11.1   && < 2.12
+    , bytestring >= 0.10.12.1 && < 0.12
+    , hspec      >= 2.8.5     && < 2.12