diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8da7ee74..989418c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,14 +1,14 @@
-### Version 0.20.0 (unreleased)
- - Refactor of internal code.
- - Implement unix-specific permissions copying for `-p` option
- - Performance optimizations
+### Version 1.0.0
  - Remove the C dependency on miniz, and replace it with a Rust version ([#57](https://github.com/shssoichiro/oxipng/issues/57))
     - This improves decompression speed by 15%. Compression speed is not affected.
     - [SEMVER_MAJOR] This also obsoletes the `-zm` command line option and the `memory` key on the `Options` struct.
     - Presets will be updated automatically. This means that presets 3 and higher will run significantly more quickly.
- - Adjust the presets, now that memory is no longer an option.
+ - [SEMVER_MAJOR] Adjust the presets, now that `-zm` is no longer an option.
     - `-o3` now tests all filter types. This will result in 50% more trials than before, but may give up to 10% more compression gain.
-    - `-o4` and higher now test all alpha optimization types. This adds 5 trials specific to the alpha channel. Only transparent images are affected. 
+    - `-o4` and higher now test all alpha optimization types. This adds 5 trials specific to the alpha channel. Only transparent images are affected.
+ - Implement unix-specific permissions copying for `-p` option
+ - Performance optimizations
+ - Refactor of internal code 
 
 ### Version 0.19.0
  - [SEMVER_MAJOR] Default to overwriting the input file if `out_file` is not set.
diff --git a/Cargo.lock b/Cargo.lock
index 86008435..f0c74309 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -318,7 +318,7 @@ dependencies = [
 
 [[package]]
 name = "oxipng"
-version = "0.19.0"
+version = "1.0.0"
 dependencies = [
  "bit-vec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 6ce82f31..485b6af8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ homepage = "https://github.com/shssoichiro/oxipng"
 license = "MIT"
 name = "oxipng"
 repository = "https://github.com/shssoichiro/oxipng"
-version = "0.19.0"
+version = "1.0.0"
 
 [[bin]]
 doc = false
diff --git a/README.md b/README.md
index 55d46ad9..fb116ec1 100644
--- a/README.md
+++ b/README.md
@@ -94,31 +94,31 @@ Oxipng is open-source software, distributed under the MIT license.
 
 ## Benchmarks
 
-Tested oxipng 0.19.0 (compiled on rustc 1.25.0-nightly (f62f77403 2018-01-10)) against OptiPNG version 0.7.7 on Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz with 8 logical cores
+Tested oxipng 1.0.0 (compiled on rustc 1.25.0-nightly (def3269a7 2018-01-30)) against OptiPNG version 0.7.7 on Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz with 8 logical cores
 
 
 
 Benchmark #1: ./target/release/oxipng -P ./tests/files/rgb_16_should_be_grayscale_8.png
 
-  Time (mean ± σ):     137.7 ms ±   3.3 ms
+  Time (mean ± σ):     138.6 ms ±   4.5 ms    [User: 251.7 ms, System: 18.0 ms]
  
-  Range (min … max):   131.8 ms … 144.2 ms
+  Range (min … max):   133.4 ms … 146.9 ms
  
 Benchmark #2: optipng -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
 
-  Time (mean ± σ):     293.7 ms ±   7.0 ms
+  Time (mean ± σ):     286.3 ms ±   4.0 ms    [User: 286.4 ms, System: 0.7 ms]
  
-  Range (min … max):   286.0 ms … 310.2 ms
+  Range (min … max):   280.6 ms … 296.0 ms
  
 Benchmark #1: ./target/release/oxipng -o4 -P ./tests/files/rgb_16_should_be_grayscale_8.png
 
-  Time (mean ± σ):     255.6 ms ±   5.3 ms
+  Time (mean ± σ):     225.1 ms ±   6.1 ms    [User: 735.0 ms, System: 30.3 ms]
  
-  Range (min … max):   245.7 ms … 261.1 ms
+  Range (min … max):   216.8 ms … 240.5 ms
  
 Benchmark #2: optipng -o 4 -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
 
-  Time (mean ± σ):     1.001 s ± 0.013 s
+  Time (mean ± σ):     969.1 ms ±  10.2 ms    [User: 967.7 ms, System: 1.6 ms]
  
-  Range (min … max):   0.982 s … 1.017 s
+  Range (min … max):   954.4 ms … 985.8 ms