diff --git a/Cargo.lock b/Cargo.lock
index 5a70380..531008a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -413,7 +413,7 @@ dependencies = [
 
 [[package]]
 name = "bin"
-version = "1.0.3"
+version = "2.0.0"
 dependencies = [
  "actix",
  "actix-web",
diff --git a/Cargo.toml b/Cargo.toml
index da259de..3230c8b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,11 +1,11 @@
 [package]
 name = "bin"
-version = "1.0.3"
+version = "2.0.0"
 description = "a paste bin."
 repository = "https://github.com/w4/bin"
 license = "WTFPL OR 0BSD"
 authors = ["Jordan Doyle <jordan@doyle.la>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 argh = "0.1"
diff --git a/Dockerfile b/Dockerfile
index df3ab05..12dcf03 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,15 +1,12 @@
-FROM rust:1.45-slim-stretch AS builder
-RUN rustup install nightly-x86_64-unknown-linux-gnu
-
-RUN apt update && apt install -y libclang-dev
+FROM rust:1-slim AS builder
 
 COPY . /sources
 WORKDIR /sources
-RUN cargo +nightly build --release
+RUN cargo build --release
 RUN chown nobody:nogroup /sources/target/release/bin
 
 
-FROM debian:stretch-slim
+FROM debian:bullseye-slim
 COPY --from=builder /sources/target/release/bin /pastebin
 
 USER nobody
diff --git a/README.md b/README.md
index 71f8337..68c5e52 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ a paste bin.
 
 A paste bin that's actually minimalist. No database requirement, no commenting functionality, no self-destructing or time bomb messages and no social media integration—just an application to quickly send snippets of text to people.
 
-[bin](https://bin.gy/) is written in Rust in around 200 lines of code. It's fast, it's simple, there's code highlighting and you can ⌘+A without going to the 'plain' page. It's revolutionary in the paste bin industry, disrupting markets and pushing boundaries never seen before.
+[bin](https://bin.gy/) is written in Rust in around 300 lines of code. It's fast, it's simple, there's code highlighting and you can ⌘+A without going to the 'plain' page. It's revolutionary in the paste bin industry, disrupting markets and pushing boundaries never seen before.
 
 ##### so how do you get bin?
 
@@ -29,9 +29,22 @@ $ ./bin
 
 ##### funny, what settings are there?
 
-bin uses [rocket](https://rocket.rs) so you can add a [rocket config file](https://api.rocket.rs/v0.3/rocket/config/) if you like. You can set `ROCKET_PORT` in your environment if you want to change the default port (8820).
+```
+$ ./bin
 
-bin's only configuration value is `BIN_BUFFER_SIZE` which defaults to 2000. Change this value if you want your bin to hold more pastes.
+Usage: bin [<bind_addr>] [--buffer-size <buffer-size>] [--max-paste-size <max-paste-size>]
+
+a pastebin.
+
+Positional Arguments:
+  bind_addr         socket address to bind to (default: 127.0.0.1:8820)
+
+Options:
+  --buffer-size     maximum amount of pastes to store before rotating (default:
+                    1000)
+  --max-paste-size  maximum paste size in bytes (default. 32kB)
+  --help            display usage information
+```
 
 ##### is there curl support?