diff --git a/.github/workflows/basic.yml b/.github/workflows/basic.yml
index 22f5e11..6b1b7fd 100644
--- a/.github/workflows/basic.yml
+++ b/.github/workflows/basic.yml
@@ -16,17 +16,10 @@ jobs:
         toolchain:
           - stable
           - nightly
-        profile:
-          - dev
-          - release
         os:
           - ubuntu-latest
           - windows-latest
           - macos-latest
-        features:
-          - ""
-          - "--no-default-features"
-          - "--all-features"
 
     runs-on: ${{matrix.os}}
 
@@ -37,19 +30,27 @@ jobs:
         with:
           toolchain: ${{matrix.toolchain}}
 
+      - uses: taiki-e/install-action@cargo-hack
+
       - name: Show version
         run: cargo version
 
+      - name: Check
+        run: cargo hack check -v --feature-powerset --no-dev-deps
+
       - name: Build
-        run: cargo build --verbose --profile ${{matrix.profile}} ${{matrix.features}}
+        run: cargo hack build -v --each-feature
 
       - name: Run tests
-        run: cargo test --verbose --profile ${{matrix.profile}} ${{matrix.features}} -- --nocapture
+        run: cargo hack test -v --each-feature -- --nocapture
+
+      - name: Run tests (release)
+        run: cargo hack test -v --each-feature --release -- --nocapture
 
       - name: Run loom tests
         env:
           RUSTFLAGS: "--cfg loom"
-        run: cargo test --verbose --profile ${{matrix.profile}} ${{matrix.features}} loom -- --nocapture
+        run: cargo hack test -v --each-feature --release loom -- --nocapture
 
   fmt:
     runs-on: ubuntu-latest
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 9754e15..a01be9a 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,40 +1,44 @@
 {
-    "cSpell.words": [
-        "alloc",
-        "arcstr",
-        "bstr",
-        "bstring",
-        "clippy",
-        "clonable",
-        "codecov",
-        "decr",
-        "endianness",
-        "FFFD",
-        "flexstr",
-        "gnuabi",
-        "hipbyt",
-        "hipstr",
-        "imstr",
-        "interoperabilty",
-        "miri",
-        "MIRIFLAGS",
-        "multibyte",
-        "nonoverlapping",
-        "powi",
-        "repr",
-        "rmatch",
-        "rmatches",
-        "rsplit",
-        "rsplitn",
-        "rustc",
-        "serde",
-        "splitn",
-        "stddev",
-        "subslice",
-        "uninit",
-        "uppercased",
-        "Zmiri"
-    ],
-    "rust-analyzer.check.features": "all",
-    "rust-analyzer.cargo.features": "all"
-}
\ No newline at end of file
+  "cSpell.words": [
+    "alloc",
+    "arcstr",
+    "bstr",
+    "bstring",
+    "clippy",
+    "clonable",
+    "codecov",
+    "decr",
+    "endianness",
+    "FFFD",
+    "flexstr",
+    "gnuabi",
+    "hipbyt",
+    "hipstr",
+    "imstr",
+    "interoperabilty",
+    "miri",
+    "MIRIFLAGS",
+    "multibyte",
+    "nocapture",
+    "nonoverlapping",
+    "powerset",
+    "powi",
+    "repr",
+    "rmatch",
+    "rmatches",
+    "rsplit",
+    "rsplitn",
+    "rustc",
+    "RUSTFLAGS",
+    "serde",
+    "splitn",
+    "stddev",
+    "subslice",
+    "taiki-e",
+    "uninit",
+    "uppercased",
+    "Zmiri"
+  ],
+  "rust-analyzer.check.features": "all",
+  "rust-analyzer.cargo.features": "all"
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59d5dee..728bea0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,16 @@
 
 Notable changes only.
 
+## Unreleased
+
+### Changed
+
+- improve feature testing in CI
+
+### Fixed
+
+- fix `bstr` feature in `no_std`
+
 ## [0.7.0] - 2025-01-10
 
 ### Added
@@ -25,7 +35,7 @@ Notable changes only.
 - remove `serde_bytes` dependency
 - remove `sptr` dependency (following provenance API stabilization in Rust 1.84)
 
-## Fixed
+### Fixed
 
 - compilation with `serde` for non-Windows non-Unix targets, in particular wasm
 
diff --git a/src/string/bstr.rs b/src/string/bstr.rs
index 982c6b5..a130b43 100644
--- a/src/string/bstr.rs
+++ b/src/string/bstr.rs
@@ -1,9 +1,9 @@
 //! Bstr support for strings.
 
 use alloc::str;
+use alloc::string::String;
 use alloc::vec::Vec;
 use core::borrow::Borrow;
-use std::string::String;
 
 use bstr::{BStr, BString};