diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 92a3958..e6656eb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -57,14 +57,13 @@ jobs:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: ${{ matrix.rust-version.version }}
+          toolchain: ${{ matrix.rust-version }}
           components: rustfmt, clippy
       - uses: taiki-e/install-action@cargo-hack
       - uses: Swatinem/rust-cache@v2
       - name: Build
         run: |
-          cargo hack build --feature-powerset \
-            --exclude-features "${{ matrix.rust-version.build-features-excluded }}"
+          cargo hack build --feature-powerset
       - name: Test
         # Dev dependencies have an MSRV > 1.70.
         if: ${{ matrix.rust-version.version == 'stable' }}
diff --git a/Cargo.lock b/Cargo.lock
index 016f8b5..4fecc91 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -301,9 +301,9 @@ checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
 dependencies = [
  "unicode-ident",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 499a3fb..5eec9a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ keywords = ["buffers", "zero-copy", "io"]
 license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/sunshowers-code/buf-list"
-rust-version = "1.39"
+rust-version = "1.70"
 
 [lints]
 rust.unexpected_cfgs = { level = "warn", check-cfg = ["cfg(doc_cfg)"] }
diff --git a/README.md b/README.md
index c68af46..2a57a3e 100644
--- a/README.md
+++ b/README.md
@@ -99,8 +99,8 @@ fn into_try_stream<E>(buf_list: BufList) -> impl TryStream<Ok = Bytes, Error = E
 
 ## Minimum supported Rust version
 
-The minimum supported Rust version (MSRV) is **1.39**, same as the `bytes` crate. Optional
-features may cause a bump in the MSRV.
+The minimum supported Rust version (MSRV) is **1.70**. Optional features may
+cause a bump in the MSRV.
 
 The MSRV is not expected to change in the future. If the MSRV changes, it will be accompanied by
 a major version bump to `buf-list`.
diff --git a/proptest-regressions/cursor/tests.txt b/proptest-regressions/cursor/tests.txt
new file mode 100644
index 0000000..d26ffb3
--- /dev/null
+++ b/proptest-regressions/cursor/tests.txt
@@ -0,0 +1 @@
+cc bf8cfd35fe51927d4570039a090a23c4f78c40cf88e8e6ac80f6fe66f02e1a4b
diff --git a/src/cursor/mod.rs b/src/cursor/mod.rs
index 4a137bc..5338611 100644
--- a/src/cursor/mod.rs
+++ b/src/cursor/mod.rs
@@ -310,9 +310,15 @@ impl CursorData {
 
     fn read_exact_impl(&mut self, list: &BufList, buf: &mut [u8]) -> io::Result<()> {
         // This is the same as read_impl as long as there's enough space.
-        let remaining = self.num_bytes(list).saturating_sub(self.pos);
+        let total = self.num_bytes(list);
+        let remaining = total.saturating_sub(self.pos);
         let buf_len = buf.len();
         if remaining < buf_len as u64 {
+            // Rust 1.80 and above will cause the position to be set to the end
+            // of the buffer, due to (apparently)
+            // https://github.com/rust-lang/rust/pull/125404. Follow that
+            // behavior.
+            self.set_pos(list, total);
             return Err(io::Error::new(
                 io::ErrorKind::UnexpectedEof,
                 ReadExactError { remaining, buf_len },
diff --git a/src/lib.rs b/src/lib.rs
index 6489113..fe1ef93 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -109,8 +109,8 @@
 //!
 //! # Minimum supported Rust version
 //!
-//! The minimum supported Rust version (MSRV) is **1.39**, same as the `bytes` crate. Optional
-//! features may cause a bump in the MSRV.
+//! The minimum supported Rust version (MSRV) is **1.70**. Optional features may
+//! cause a bump in the MSRV.
 //!
 //! The MSRV is not expected to change in the future. If the MSRV changes, it will be accompanied by
 //! a major version bump to `buf-list`.