diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5c031691..68777490 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,8 +35,20 @@ jobs:
       - name: Run rustfmt --check
         run: cargo fmt -- --check
 
+  msrv:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      # rust-version from Cargo.toml
+      - name: Install Rust 1.66.0
+        uses: dtolnay/rust-toolchain@1.66.0
+      - name: Use predefined lockfile
+        run: mv Cargo.lock.MSRV Cargo.lock
+      - name: Build (lib only)
+        run: cargo check --locked
+
   test:
-    needs: [clippy, fmt]
+    needs: [clippy, fmt, msrv]
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
diff --git a/Cargo.lock.MSRV b/Cargo.lock.MSRV
new file mode 100644
index 00000000..6f6e9815
--- /dev/null
+++ b/Cargo.lock.MSRV
@@ -0,0 +1,859 @@
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diff --git a/Cargo.toml b/Cargo.toml
index ab92cb19..4a886c4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,4 @@
 [package]
-
 name = "statrs"
 version = "0.17.1"
 authors = ["Michael Ma"]
@@ -13,6 +12,9 @@ edition = "2021"
 
 include = ["CHANGELOG.md", "LICENSE.md", "src/", "tests/"]
 
+# When changing MSRV: Also update the README and .github/workflows/test.yml
+rust-version = "1.66.0"
+
 [lib]
 name = "statrs"
 path = "src/lib.rs"
diff --git a/README.md b/README.md
index 740e5dfe..aeaf3319 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,10 @@ cargo test
 If you'd like to modify where the data is downloaded, you can use the environment variable,
 `STATRS_NIST_DATA_DIR` for running the script and the tests.
 
+## Minimum supported Rust version (MSRV)
+
+This crate requires a Rust version of 1.66.0 or higher. Increases in MSRV will result in a semver PATCH version increase.
+
 ## Contributing
 
 Thanks for your help to improve the project!