diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,8 +1,12 @@
 # Changelog for srtree
 
+## 0.1.2.1
+
+- Better bounds for base (compatible with stackage nightly)
+
 ## 0.1.2.0
 
-Implemented `deriveParamBy` to calculate the derivative by the parameters indexed by `ix`
+- Implemented `deriveParamBy` to calculate the derivative by the parameters indexed by `ix`
 
 ## 0.1.1.0
 
diff --git a/srtree.cabal b/srtree.cabal
--- a/srtree.cabal
+++ b/srtree.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           srtree
-version:        0.1.2.0
+version:        0.1.2.1
 synopsis:       A general framework to work with Symbolic Regression expression trees.
 description:    A Symbolic Regression Tree data structure to work with mathematical expressions with support to first order derivative and simplification;
 category:       Math, Data, Data Structures
@@ -36,7 +36,7 @@
   hs-source-dirs:
       src
   build-depends:
-      base ==4.16.*
+      base >=4.16 && <4.18
     , containers ==0.6.*
     , mtl ==2.2.*
     , random ==1.2.*
@@ -52,7 +52,7 @@
       test
   ghc-options: -threaded -rtsopts -with-rtsopts=-N
   build-depends:
-      base ==4.16.*
+      base >=4.16 && <4.18
     , containers ==0.6.*
     , mtl ==2.2.*
     , random ==1.2.*