diff --git a/README.md b/README.md
index 5acd566..7ae657b 100644
--- a/README.md
+++ b/README.md
@@ -18,11 +18,12 @@ or can be manipulated in other ways with:
 wasm-tools component wit wit/ ...
 ```
 
-The HTTP proposal depends on the WASI IO and Logging proposals. For simplicity,
-the Wit files for these proposals are currently copied into the `wit/deps`
-directory and will be updated periodically to match their respective proposals.
-As the Wit tooling develops, we should be able to avoid this form of manual
-vendoring.
+The `wit/deps` directory contains a live snapshot of the contents of several
+other WASI proposals upon which this proposal depends. It is automatically
+updated by running [`wit-deps update`](https://crates.io/crates/wit-deps-cli)
+in the root directory, which fetches the live contents of the `main` branch of
+each proposal. As things stablize, `wit/deps.toml` will be updated to refer to
+versioned releases.
 
 ### Current Phase
 
diff --git a/wit/deps.lock b/wit/deps.lock
new file mode 100644
index 0000000..846adb4
--- /dev/null
+++ b/wit/deps.lock
@@ -0,0 +1,19 @@
+[io]
+url = "https://github.com/WebAssembly/wasi-io/archive/main.tar.gz"
+sha256 = "7450142aeb3f1688ee2b12853344e262caf6aee0718dc0296316f7f6b3afd91f"
+sha512 = "5cc0f60d190e16d6dd52a4ca2fc862f007465e7642e98061b41c90778e1f2b00aeb2543b6fadbb6a137dd548d86e9e55edcfb30388adcc6a160b4cdc29d378ec"
+
+[logging]
+url = "https://github.com/WebAssembly/wasi-logging/archive/main.tar.gz"
+sha256 = "f378a2b6a36af096528ec5e7031da474990cecaec1949c663befc5066d719f6f"
+sha512 = "ba09307b12f5428c3058d878001c9fb15df21933c6203328f785d5009a4fc0cf304950271590d4146305a2d8b8988595f396d955961168cb6bfa7ea9af1cc362"
+
+[poll]
+url = "https://github.com/WebAssembly/wasi-poll/archive/main.tar.gz"
+sha256 = "065422b0ea6ccb2a9facc6b87b902eef110c53d76fc31f341a6bc8d0b0285b6a"
+sha512 = "19a55cd3072a19ae6a1774723a4962e7a155a5ce89a27175e8c76020efb4d00bc92ebb78427d92bcb8effd4f0d03ebf0a0daa747ecd981b8d31d5abc2ad86423"
+
+[random]
+url = "https://github.com/WebAssembly/wasi-random/archive/main.tar.gz"
+sha256 = "79b6417bb1ab3c82c241c56021e717f258e2a0b3ab94db93907ca11d7f92ed66"
+sha512 = "1e657ac56420e65bde75eabea920a605a0ff4adc6f2ba8b7cf1c37a603710449bc1a29568dda2b61c04ae9889d2b1a82b9935d4b9d573eb48a83e0ecf9cad591"
diff --git a/wit/deps.toml b/wit/deps.toml
new file mode 100644
index 0000000..907c4ac
--- /dev/null
+++ b/wit/deps.toml
@@ -0,0 +1,4 @@
+io = "https://github.com/WebAssembly/wasi-io/archive/main.tar.gz"
+logging = "https://github.com/WebAssembly/wasi-logging/archive/main.tar.gz"
+poll = "https://github.com/WebAssembly/wasi-poll/archive/main.tar.gz"
+random = "https://github.com/WebAssembly/wasi-random/archive/main.tar.gz"
diff --git a/wit/deps/io/world.wit b/wit/deps/io/world.wit
new file mode 100644
index 0000000..bae7c92
--- /dev/null
+++ b/wit/deps/io/world.wit
@@ -0,0 +1,3 @@
+default world example-world {
+    import streams: pkg.streams
+}
diff --git a/wit/deps/logging/world.wit b/wit/deps/logging/world.wit
new file mode 100644
index 0000000..b5af151
--- /dev/null
+++ b/wit/deps/logging/world.wit
@@ -0,0 +1,3 @@
+default world example-world {
+    import logging: pkg.logging
+}
diff --git a/wit/deps/poll/world.wit b/wit/deps/poll/world.wit
new file mode 100644
index 0000000..3a002e0
--- /dev/null
+++ b/wit/deps/poll/world.wit
@@ -0,0 +1,3 @@
+default world example-world {
+    import poll: pkg.poll
+}
diff --git a/wit/deps/random/world.wit b/wit/deps/random/world.wit
new file mode 100644
index 0000000..8d54b3b
--- /dev/null
+++ b/wit/deps/random/world.wit
@@ -0,0 +1,3 @@
+default world example-world {
+    import random: pkg.random
+}