diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+1.5.7
+
+* Increase upper bound on `doctest`
+
 1.5.6
 
 * Increase upper bound on `exceptions`
diff --git a/turtle.cabal b/turtle.cabal
--- a/turtle.cabal
+++ b/turtle.cabal
@@ -1,5 +1,5 @@
 Name: turtle
-Version: 1.5.6
+Version: 1.5.7
 Cabal-Version: >=1.10
 Build-Type: Simple
 License: BSD3
@@ -99,7 +99,7 @@
     Default-Language: Haskell2010
     Build-Depends:
         base    >= 4   && < 5   ,
-        doctest >= 0.7 && < 0.15
+        doctest >= 0.7 && < 0.16
 
 test-suite regression-broken-pipe
     Type: exitcode-stdio-1.0