diff --git a/json-encoder.cabal b/json-encoder.cabal
--- a/json-encoder.cabal
+++ b/json-encoder.cabal
@@ -1,7 +1,7 @@
 name:
   json-encoder
 version:
-  0.1.5
+  0.1.6
 synopsis:
   A direct-to-bytes single-pass JSON encoder with a declarative DSL
 description:
@@ -57,4 +57,4 @@
     contravariant >= 1.3 && < 2,
     semigroups >= 0.18 && < 0.19,
     -- 
-    base-prelude >= 0.1.21 && < 0.2
+    base-prelude >= 0.1.21 && < 2
diff --git a/library/JSONEncoder/Builders.hs b/library/JSONEncoder/Builders.hs
--- a/library/JSONEncoder/Builders.hs
+++ b/library/JSONEncoder/Builders.hs
@@ -28,6 +28,8 @@
     '\n' -> "\\n"
     '\r' -> "\\r"
     '\t' -> "\\t"
+    '\b' -> "\\b"
+    '\f' -> "\\f"
     char -> encodedChar char
 
 {-# INLINABLE encodedChar #-}