diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+0.9.1
+=====
+
+* Change `base` version to be `< 5`.
+
 0.9.0
 =====
 
@@ -21,10 +26,6 @@
 * Move string related reexports and functions to `Conv` module.
 * Rename `Conv` module to `String`.
 * Move `print` function to `Print` module.
-
-0.7.2
-=======
-
 * [#77](https://github.com/serokell/universum/issues/77):
   Add `modify'` function to export list.
 
diff --git a/universum.cabal b/universum.cabal
--- a/universum.cabal
+++ b/universum.cabal
@@ -1,5 +1,5 @@
 name: universum
-version: 0.9.0
+version: 0.9.1
 cabal-version: >=1.10
 build-type: Simple
 license: MIT
@@ -51,7 +51,7 @@
         Monad.Maybe
         Monad.Trans
     build-depends:
-        base <4.10,
+        base <5,
         bytestring <0.11,
         containers <0.6,
         deepseq <1.5,
@@ -81,7 +81,7 @@
     type: exitcode-stdio-1.0
     main-is: Main.hs
     build-depends:
-        base <4.10,
+        base <5,
         universum -any,
         containers <0.6,
         criterion <1.2,