diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 8340af02..30086c6c 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -106,11 +106,21 @@ jobs:
         RUSTFLAGS: -D warnings -C link-args=-S
       run: cargo build --release --all-targets --target=wasm32-wasi
 
+    - name: Build (wasm32-wasi with wee-alloc)
+      env:
+        RUSTFLAGS: -D warnings -C link-args=-S
+      run: cargo build --release --all-targets --target=wasm32-wasi --features=wee-alloc
+
     - name: Clippy (wasm32-wasi)
       env:
         RUSTFLAGS: -D warnings -C link-args=-S
       run: cargo clippy --release --all-targets --target=wasm32-wasi
 
+    - name: Clippy (wasm32-wasi with wee-alloc)
+      env:
+        RUSTFLAGS: -D warnings -C link-args=-S
+      run: cargo clippy --release --all-targets --target=wasm32-wasi --features=wee-alloc
+
     - name: Format (rustfmt)
       run: cargo fmt -- --check
 
@@ -151,11 +161,21 @@ jobs:
         RUSTFLAGS: -D warnings -C link-args=-S
       run: cargo build --release --all-targets --target=wasm32-wasi
 
+    - name: Build (wasm32-wasi with wee-alloc)
+      env:
+        RUSTFLAGS: -D warnings -C link-args=-S
+      run: cargo build --release --all-targets --target=wasm32-wasi --features=wee-alloc
+
     - name: Clippy (wasm32-wasi)
       env:
         RUSTFLAGS: -D warnings -C link-args=-S
       run: cargo clippy --release --all-targets --target=wasm32-wasi
 
+    - name: Clippy (wasm32-wasi with wee-alloc)
+      env:
+        RUSTFLAGS: -D warnings -C link-args=-S
+      run: cargo clippy --release --all-targets --target=wasm32-wasi --features=wee-alloc
+
     - name: Format (rustfmt)
       run: cargo fmt -- --check
 
diff --git a/BUILD b/BUILD
index f323a4bf..53d433f6 100644
--- a/BUILD
+++ b/BUILD
@@ -8,6 +8,5 @@ rust_library(
     deps = [
         "//bazel/cargo:hashbrown",
         "//bazel/cargo:log",
-        "//bazel/cargo:wee_alloc",
     ],
 )
diff --git a/Cargo.toml b/Cargo.toml
index 25fd5a25..2f436eff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,10 +8,13 @@ license = "Apache-2.0"
 repository = "https://github.com/proxy-wasm/proxy-wasm-rust-sdk"
 edition = "2018"
 
+[features]
+wee-alloc = ["wee_alloc"]
+
 [dependencies]
 hashbrown = "0.9"
 log = "0.4"
-wee_alloc = "0.4"
+wee_alloc = { version = "0.4", optional = true }
 
 [dev-dependencies]
 chrono = "0.4"
diff --git a/README.md b/README.md
index c2823fe7..002b7764 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,14 @@
 
 + [Extending Envoy with WASM and Rust](https://antweiss.com/blog/extending-envoy-with-wasm-and-rust/)
 + [Extending Istio with Rust and WebAssembly](https://blog.red-badger.com/extending-istio-with-rust-and-webassembly)
+
+# Updating dependencies
+
+When updating dependencies, you need to regenerate `BUILD` files to match updated `Cargo.toml`:
+```
+cargo install cargo-raze --version 0.3.8
+rm -rf bazel/cargo/
+cargo generate-lockfile
+cargo raze --output=bazel/cargo
+mv Cargo.lock bazel/cargo/
+```
\ No newline at end of file
diff --git a/bazel/cargo/BUILD b/bazel/cargo/BUILD
index 4a095b98..b72a27f6 100644
--- a/bazel/cargo/BUILD
+++ b/bazel/cargo/BUILD
@@ -23,8 +23,3 @@ alias(
     actual = "@raze__log__0_4_11//:log",
     tags = ["cargo-raze"],
 )
-alias(
-    name = "wee_alloc",
-    actual = "@raze__wee_alloc__0_4_5//:wee_alloc",
-    tags = ["cargo-raze"],
-)
diff --git a/bazel/cargo/crates.bzl b/bazel/cargo/crates.bzl
index e133346e..d7dbf9bb 100644
--- a/bazel/cargo/crates.bzl
+++ b/bazel/cargo/crates.bzl
@@ -79,15 +79,6 @@ def raze_fetch_remote_crates():
         build_file = Label("//bazel/cargo/remote:log-0.4.11.BUILD"),
     )
 
-    _new_http_archive(
-        name = "raze__memory_units__0_4_0",
-        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/memory_units/memory_units-0.4.0.crate",
-        type = "tar.gz",
-        sha256 = "8452105ba047068f40ff7093dd1d9da90898e63dd61736462e9cdda6a90ad3c3",
-        strip_prefix = "memory_units-0.4.0",
-        build_file = Label("//bazel/cargo/remote:memory_units-0.4.0.BUILD"),
-    )
-
     _new_http_archive(
         name = "raze__num_integer__0_1_44",
         url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/num-integer/num-integer-0.1.44.crate",
@@ -124,15 +115,6 @@ def raze_fetch_remote_crates():
         build_file = Label("//bazel/cargo/remote:wasi-0.10.0+wasi-snapshot-preview1.BUILD"),
     )
 
-    _new_http_archive(
-        name = "raze__wee_alloc__0_4_5",
-        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/wee_alloc/wee_alloc-0.4.5.crate",
-        type = "tar.gz",
-        sha256 = "dbb3b5a6b2bb17cb6ad44a2e68a43e8d2722c997da10e928665c72ec6c0a0b8e",
-        strip_prefix = "wee_alloc-0.4.5",
-        build_file = Label("//bazel/cargo/remote:wee_alloc-0.4.5.BUILD"),
-    )
-
     _new_http_archive(
         name = "raze__winapi__0_3_9",
         url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/winapi/winapi-0.3.9.crate",
diff --git a/bazel/cargo/remote/memory_units-0.4.0.BUILD b/bazel/cargo/remote/memory_units-0.4.0.BUILD
deleted file mode 100644
index a8964bfa..00000000
--- a/bazel/cargo/remote/memory_units-0.4.0.BUILD
+++ /dev/null
@@ -1,43 +0,0 @@
-"""
-cargo-raze crate build file.
-
-DO NOT EDIT! Replaced on runs of cargo-raze
-"""
-package(default_visibility = [
-  # Public for visibility by "@raze__crate__version//" targets.
-  #
-  # Prefer access through "//bazel/cargo", which limits external
-  # visibility to explicit Cargo.toml dependencies.
-  "//visibility:public",
-])
-
-licenses([
-  "reciprocal", # MPL-2.0 from expression "MPL-2.0"
-])
-
-load(
-    "@io_bazel_rules_rust//rust:rust.bzl",
-    "rust_library",
-    "rust_binary",
-    "rust_test",
-)
-
-
-
-rust_library(
-    name = "memory_units",
-    crate_type = "lib",
-    deps = [
-    ],
-    srcs = glob(["**/*.rs"]),
-    crate_root = "src/lib.rs",
-    edition = "2015",
-    rustc_flags = [
-        "--cap-lints=allow",
-    ],
-    version = "0.4.0",
-    tags = ["cargo-raze"],
-    crate_features = [
-    ],
-)
-
diff --git a/bazel/cargo/remote/wee_alloc-0.4.5.BUILD b/bazel/cargo/remote/wee_alloc-0.4.5.BUILD
deleted file mode 100644
index 26e2bc58..00000000
--- a/bazel/cargo/remote/wee_alloc-0.4.5.BUILD
+++ /dev/null
@@ -1,48 +0,0 @@
-"""
-cargo-raze crate build file.
-
-DO NOT EDIT! Replaced on runs of cargo-raze
-"""
-package(default_visibility = [
-  # Public for visibility by "@raze__crate__version//" targets.
-  #
-  # Prefer access through "//bazel/cargo", which limits external
-  # visibility to explicit Cargo.toml dependencies.
-  "//visibility:public",
-])
-
-licenses([
-  "reciprocal", # MPL-2.0 from expression "MPL-2.0"
-])
-
-load(
-    "@io_bazel_rules_rust//rust:rust.bzl",
-    "rust_library",
-    "rust_binary",
-    "rust_test",
-)
-
-
-# Unsupported target "build-script-build" with type "custom-build" omitted
-
-rust_library(
-    name = "wee_alloc",
-    crate_type = "lib",
-    deps = [
-        "@raze__cfg_if__0_1_10//:cfg_if",
-        "@raze__memory_units__0_4_0//:memory_units",
-    ],
-    srcs = glob(["**/*.rs"]),
-    crate_root = "src/lib.rs",
-    edition = "2015",
-    rustc_flags = [
-        "--cap-lints=allow",
-    ],
-    version = "0.4.5",
-    tags = ["cargo-raze"],
-    crate_features = [
-        "default",
-        "size_classes",
-    ],
-)
-
diff --git a/bazel/cargo/remote/winapi-0.3.9.BUILD b/bazel/cargo/remote/winapi-0.3.9.BUILD
index 49b1e59a..ed409429 100644
--- a/bazel/cargo/remote/winapi-0.3.9.BUILD
+++ b/bazel/cargo/remote/winapi-0.3.9.BUILD
@@ -39,16 +39,13 @@ rust_library(
     version = "0.3.9",
     tags = ["cargo-raze"],
     crate_features = [
-        "memoryapi",
         "minwinbase",
         "minwindef",
         "ntdef",
         "profileapi",
         "std",
-        "synchapi",
         "sysinfoapi",
         "timezoneapi",
-        "winbase",
     ],
 )
 
diff --git a/src/allocator.rs b/src/allocator.rs
index 3c708a60..c7e1199c 100644
--- a/src/allocator.rs
+++ b/src/allocator.rs
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#[cfg(feature = "wee-alloc")]
 #[global_allocator]
 static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;