diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 25b643fe..3cef1ada 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -77,13 +77,25 @@ jobs:
 
   minimum:
     name: Minimum Rust compiler
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-2022, macos-latest, ubuntu-latest]
     env:
       # If this is changed to pass tests, then set `rust-version` in `Cargo.toml` to the same version.
-      version: 1.56.1
+      version: 1.63.0
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust (rustup)
-        run: rustup update ${version} --no-self-update && rustup default ${version}
+        run: |
+          rustup toolchain install ${version} nightly --profile minimal --no-self-update
+          rustup default ${version}
+          cargo +nightly update -Zminimal-versions
         shell: bash
       - run: cargo build
+      - run: cargo build --features zlib
+      - run: cargo build --features zlib --no-default-features
+      - run: cargo build --features zlib-default --no-default-features
+      - run: cargo build --features zlib-ng-compat --no-default-features
+      - run: cargo build --features zlib-ng --no-default-features
+      - run: cargo build --features cloudflare_zlib --no-default-features
diff --git a/Cargo.toml b/Cargo.toml
index 69d4e2de..47c7421d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "flate2"
 authors = ["Alex Crichton <alex@alexcrichton.com>", "Josh Triplett <josh@joshtriplett.org>"]
-version = "1.0.32"
+version = "1.0.33"
 edition = "2018"
 license = "MIT OR Apache-2.0"
 readme = "README.md"
@@ -19,8 +19,8 @@ and raw deflate streams.
 exclude = [".*"]
 
 [dependencies]
-libz-sys = { version = "1.1.8", optional = true, default-features = false }
-libz-ng-sys = { version = "1.1.8", optional = true }
+libz-sys = { version = "1.1.20", optional = true, default-features = false }
+libz-ng-sys = { version = "1.1.16", optional = true }
 libz-rs-sys = { version = "0.2.1", optional = true, default-features = false, features = ["std", "rust-allocator"] }
 cloudflare-zlib-sys = { version = "0.3.0", optional = true }
 miniz_oxide = { version = "0.8.0", optional = true, default-features = false, features = ["with-alloc"] }