diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dd5b5ab..b480def 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -212,9 +212,7 @@ jobs:
         run: cargo +stable semver-checks check-release
         working-directory: lib/macro
       - run: rustup install 1.48
-      - run: mv lib/Cargo.lock.msrv lib/Cargo.lock
-      - run: mv lib/macro/internal/Cargo.lock.msrv lib/macro/internal/Cargo.lock
-      - run: mv lib/macro/Cargo.lock.msrv lib/macro/Cargo.lock
+      - run: cd lib && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib
@@ -233,18 +231,23 @@ jobs:
       - name: cd lib && cargo +1.48 build --release --no-default-features
         run: cargo +1.48 build --release --no-default-features
         working-directory: lib
+      - run: cd lib && rm Cargo.lock
+      - run: cd lib/macro/internal && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib/macro/internal && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib/macro/internal
       - name: cd lib/macro/internal && cargo +1.48 build --release
         run: cargo +1.48 build --release
         working-directory: lib/macro/internal
+      - run: cd lib/macro/internal && rm Cargo.lock
+      - run: cd lib/macro && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib/macro && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib/macro
       - name: cd lib/macro && cargo +1.48 build --release
         run: cargo +1.48 build --release
         working-directory: lib/macro
+      - run: cd lib/macro && rm Cargo.lock
   windows:
     runs-on: windows-latest
     steps:
@@ -324,9 +327,7 @@ jobs:
         run: cargo +stable build --release
         working-directory: bin
       - run: rustup install 1.48
-      - run: mv lib/Cargo.lock.msrv lib/Cargo.lock
-      - run: mv lib/macro/internal/Cargo.lock.msrv lib/macro/internal/Cargo.lock
-      - run: mv lib/macro/Cargo.lock.msrv lib/macro/Cargo.lock
+      - run: cd lib && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib
@@ -345,15 +346,20 @@ jobs:
       - name: cd lib && cargo +1.48 build --release --no-default-features
         run: cargo +1.48 build --release --no-default-features
         working-directory: lib
+      - run: cd lib && rm Cargo.lock
+      - run: cd lib/macro/internal && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib/macro/internal && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib/macro/internal
       - name: cd lib/macro/internal && cargo +1.48 build --release
         run: cargo +1.48 build --release
         working-directory: lib/macro/internal
+      - run: cd lib/macro/internal && rm Cargo.lock
+      - run: cd lib/macro && cp Cargo.lock.msrv Cargo.lock
       - name: cd lib/macro && cargo +1.48 build
         run: cargo +1.48 build
         working-directory: lib/macro
       - name: cd lib/macro && cargo +1.48 build --release
         run: cargo +1.48 build --release
         working-directory: lib/macro
+      - run: cd lib/macro && rm Cargo.lock
diff --git a/lib/CHANGELOG.md b/lib/CHANGELOG.md
index 5939605..e1a915f 100644
--- a/lib/CHANGELOG.md
+++ b/lib/CHANGELOG.md
@@ -5,7 +5,7 @@
 ### Minor
 
 - Make some functions `must_use`
-- Bump MSRV from 1.47 to 1.70
+- Bump MSRV from 1.47 to 1.48
 
 ### Patch
 
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 339c16a..891dc88 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -147,14 +147,17 @@
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 // TODO: This list up to warn(clippy::pedantic) should ideally use a lint group.
 #![warn(elided_lifetimes_in_paths)]
-#![warn(let_underscore_drop)]
+// TODO(msrv): #![warn(let_underscore_drop)]
 #![warn(missing_debug_implementations)]
 #![warn(missing_docs)]
 #![warn(unreachable_pub)]
+// TODO(msrv): #![warn(unsafe_op_in_unsafe_fn)]
 #![warn(unused_results)]
+#![allow(unused_unsafe)] // TODO(msrv)
 #![warn(clippy::pedantic)]
 #![allow(clippy::enum_glob_use)]
 #![allow(clippy::similar_names)]
+#![allow(clippy::uninlined_format_args)] // TODO(msrv)
 
 #[cfg(feature = "alloc")]
 extern crate alloc;
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 8b36193..3b048ae 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -164,6 +164,15 @@ impl Action {
                 args: vec![format!("+{}", self.toolchain)],
             };
         }
+        if self.toolchain == Toolchain::Msrv {
+            let lock = "Cargo.lock";
+            let backup = "Cargo.lock.backup";
+            let msrv = "Cargo.lock.msrv";
+            instructions += Instruction::shell("mv", &[lock, backup]);
+            instructions += Instruction::shell("cp", &[msrv, lock]);
+            instructions.0.rotate_right(2);
+            instructions += Instruction::shell("mv", &[backup, lock]);
+        }
         instructions
     }
 }
@@ -183,6 +192,15 @@ struct Instruction {
 }
 
 impl Instruction {
+    fn shell(cmd: &str, args: &[&str]) -> Self {
+        Instruction {
+            executor: Executor::Shell,
+            env: vec![],
+            cmd: cmd.to_string(),
+            args: args.iter().map(|x| x.to_string()).collect(),
+        }
+    }
+
     fn execute(&self, toolchain: Toolchain, dir: Dir) {
         let mut command = match self.executor {
             Executor::Cargo => {
@@ -371,19 +389,6 @@ impl Flags {
                             run: Some(format!("rustup install {}", actions[0].toolchain)),
                             ..Default::default()
                         });
-
-                        if actions[0].toolchain == Toolchain::Msrv {
-                            for dir in Dir::iter().filter(|x| x.is_published() && x != &Dir::Bin) {
-                                job.steps.push(WorkflowStep {
-                                    run: Some(format!(
-                                        "mv {}/Cargo.lock.msrv {}/Cargo.lock",
-                                        dir, dir
-                                    )),
-                                    ..Default::default()
-                                });
-                            }
-                        }
-
                         let components: BTreeSet<_> = actions
                             .iter()
                             .filter_map(|x| match x.task {