diff --git a/.cirrus.yml b/.cirrus.yml
index 1c2e9a6a83..c41293bb82 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -17,6 +17,7 @@ task:
     - fetch https://sh.rustup.rs -o rustup.sh
     - sh rustup.sh -y --profile=minimal --default-toolchain 1.41.0
     - $HOME/.cargo/bin/rustup target add i686-unknown-freebsd
+    - cp Cargo.lock.msrv Cargo.lock
   amd64_test_script:
     - . $HOME/.cargo/env
     - cargo test
@@ -49,6 +50,7 @@ task:
     - sh rustup.sh -y --profile=minimal --default-toolchain 1.41.0
     - . $HOME/.cargo/env
     - bash ci/install.sh
+    - cp Cargo.lock.msrv Cargo.lock
   script:
     - . $HOME/.cargo/env
     - bash ci/script.sh
@@ -104,6 +106,7 @@ task:
     - sh rustup.sh -y --profile=minimal --default-toolchain 1.41.0
     - . $HOME/.cargo/env
     - bash ci/install.sh
+    - cp Cargo.lock.msrv Cargo.lock
   script:
     - . $HOME/.cargo/env || true
     - bash ci/script.sh
@@ -112,10 +115,6 @@ task:
 # Tasks for Linux amd64 builds
 task:
   matrix:
-    - name: Rust Stable
-      env:
-        TARGET: x86_64-unknown-linux-gnu
-        TOOLCHAIN: stable
     - name: Linux x86_64
       env:
         TARGET: x86_64-unknown-linux-gnu
@@ -126,6 +125,24 @@ task:
         TOOLCHAIN: 1.41.0
   container:
     image: rust:1.41
+  setup_script:
+    - rustup toolchain install $TOOLCHAIN
+    - rustup target add --toolchain $TOOLCHAIN $TARGET
+    - cp Cargo.lock.msrv Cargo.lock
+  script:
+    - cargo +$TOOLCHAIN build --target $TARGET --all-targets
+    - cargo +$TOOLCHAIN build --target $TARGET --all-targets --release
+    - cargo +$TOOLCHAIN test --target $TARGET
+    - cargo +$TOOLCHAIN test --target $TARGET --release
+  before_cache_script: rm -rf $CARGO_HOME/registry/index
+
+task:
+  name: Rust Stable
+  container:
+    image: rust:latest
+  env:
+    TARGET: x86_64-unknown-linux-gnu
+    TOOLCHAIN: stable
   setup_script:
     - rustup toolchain install $TOOLCHAIN
     - rustup target add --toolchain $TOOLCHAIN $TARGET
@@ -176,6 +193,7 @@ task:
     image: rust:1.41
   setup_script:
     - rustup target add $TARGET
+    - cp Cargo.lock.msrv Cargo.lock
   script:
     - cargo +$TOOLCHAIN check --target $TARGET
     - cargo +$TOOLCHAIN check --target $TARGET --release
@@ -205,9 +223,9 @@ task:
   env:
     TARGET: x86_64-unknown-redox
     # Redox requires a nightly compiler.
-    # If stuff breaks, change nightly to the date in the toolchain_*
-    # directory at https://static.redox-os.org
-    TOOLCHAIN: nightly-2020-08-04
+    # If stuff breaks, change nightly to the date at
+    # https://gitlab.redox-os.org/redox-os/redox/-/blob/master/rust-toolchain
+    TOOLCHAIN: nightly-2021-06-15
   container:
     image: rustlang/rust:nightly
   setup_script:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8130d61003..c3506c04c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,14 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.22.3] - 22 January 2022
+### Changed
+
+- Relaxed the bitflags requirement from 1.3.1 to 1.1.  This partially reverts
+  #1492.  From now on, the MSRV is not guaranteed to work with all versions of
+  all dependencies, just with some version of all dependencies.
+  (#[1607](https://github.com/nix-rust/nix/pull/1607))
+
 ## [0.22.2] - 28 September 2021
 ### Added
 ### Changed
diff --git a/Cargo.lock.msrv b/Cargo.lock.msrv
new file mode 100644
index 0000000000..6ded195e98
--- /dev/null
+++ b/Cargo.lock.msrv
@@ -0,0 +1,318 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+# This file was generated by running the following command:
+#     `cargo +nightly generate-lockfile -Zminimal-versions`
+# We use it on CI to test non-latest-stable Rust versions.
+[[package]]
+name = "assert-impl"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3464313de0c867016e3e69d7e1e9ae3499bcc4c18e12283d381359ed38b5b9e"
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "bitflags"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "caps"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61bf7211aad104ce2769ec05efcdfabf85ee84ac92461d142f22cf8badd0e54c"
+dependencies = [
+ "errno",
+ "libc",
+ "thiserror",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.72"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22a9137b95ea06864e018375b72adfb7db6e6f68cfc8df5a04d00288050485ee"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "errno"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f639046355ee4f37944e44f60642c6f3a7efa3cf6b78c78a0d989a8ce6c396a1"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "errno-dragonfly"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "fastrand"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3fcf0cee53519c866c09b5de1f6c56ff9d647101f81c1964fa632e148896cdf"
+dependencies = [
+ "instant",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418d37c8b1d42553c93648be529cb70f920d3baf8ef469b74b9638df426e0b4c"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.113"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eef78b64d87775463c549fbd80e19249ef436ea3bf1de2a1eb7e717ec7fab1e9"
+
+[[package]]
+name = "memoffset"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aa361d4faea93603064a027415f07bd8e1d5c88c9fbf68bf56a285428fd79ce"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "nix"
+version = "0.22.3"
+dependencies = [
+ "assert-impl",
+ "bitflags",
+ "caps",
+ "cc",
+ "cfg-if",
+ "lazy_static",
+ "libc",
+ "memoffset",
+ "rand",
+ "semver",
+ "sysctl",
+ "tempfile",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "864d3e96a899863136fc6e99f3d7cae289dafe43bf2c5ac19b70df7210c0a145"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "redox_syscall"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8383f39639269cde97d255a32bdb68c047337295414940c68bdd30c2e13203ff"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "568a8e6258aa33c13358f81fd834adb854c6f7c9468520910a9b1e8fac068012"
+
+[[package]]
+name = "syn"
+version = "1.0.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "sysctl"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bcf77d15d9b9261f4d32c0b4e3cf09050ee6aabb20cf21cb99dfe69c9a49d83"
+dependencies = [
+ "byteorder",
+ "errno",
+ "libc",
+]
+
+[[package]]
+name = "tempfile"
+version = "3.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cdb1ef4eaeeaddc8fbd371e5017057064af0911902ef36b39801f67cc6d79e4"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "libc",
+ "redox_syscall",
+ "remove_dir_all",
+ "winapi",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
+
+[[package]]
+name = "wasi"
+version = "0.10.2+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index 9ad9233a8f..12c681c7ed 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name        = "nix"
 description = "Rust friendly bindings to *nix APIs"
 edition     = "2018"
-version     = "0.22.3-alpha.0"
+version     = "0.22.3"
 authors     = ["The nix-rust Project Developers"]
 repository  = "https://github.com/nix-rust/nix"
 license     = "MIT"
@@ -33,7 +33,7 @@ targets = [
 
 [dependencies]
 libc = { version = "0.2.99", features = [ "extra_traits" ] }
-bitflags = ">= 1.1.0, < 1.3.0"
+bitflags = "1.1"
 cfg-if = "1.0"
 
 [target.'cfg(not(target_os = "redox"))'.dependencies]
diff --git a/README.md b/README.md
index a16820b95f..13617900df 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,7 @@ To use `nix`, add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-nix = "0.22.2"
+nix = "0.22.3"
 ```
 
 ## Contributing
diff --git a/src/mount/bsd.rs b/src/mount/bsd.rs
index 0144908157..cd08584e89 100644
--- a/src/mount/bsd.rs
+++ b/src/mount/bsd.rs
@@ -396,7 +396,7 @@ impl<'a> Drop for Nmount<'a> {
                 // Free the owned string.  Safe because we recorded ownership,
                 // and Nmount does not implement Clone.
                 unsafe {
-                    CString::from_raw(iov.0.iov_base as *mut c_char);
+                    drop(CString::from_raw(iov.0.iov_base as *mut c_char));
                 }
             }
         }