diff --git a/Cargo.lock b/Cargo.lock
index 60bd4b0..5a58123 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -195,7 +195,7 @@ dependencies = [
 
 [[package]]
 name = "ppbert"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index fd3dd09..e981f17 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "ppbert"
 description = "Simple pretty printer for Erlang's External Term Format"
 homepage = "https://github.com/gnuvince/ppbert"
-version = "0.6.1"
+version = "0.7.0"
 license = "MIT"
 authors = ["Vincent Foley <vfoley@gmail.com>"]
 
diff --git a/RELEASE.md b/RELEASE.md
index 1783957..4596625 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,3 +1,23 @@
+0.7.0
+=====
+
+Performance improvement
+-----------------------
+
+- Use `itoa` crate to write integers a bit faster.
+- Use `fs::read` to read input files almost two times faster.
+- Remove some heap allocations.
+
+API change
+----------
+
+- Simplify pretty printing API: `BertTerm` has two new functions,
+  `write_as_erlang` and `write_as_json`, they accept an io::Write
+  object.
+- The structs `PrettyPrinter` and `JsonPrettyPrinter` are
+  no longer public.
+
+
 0.6.1
 =====