diff --git a/src/cargo/core/resolver/resolve.rs b/src/cargo/core/resolver/resolve.rs
index c572e27d5e0..ca3ee43a2ba 100644
--- a/src/cargo/core/resolver/resolve.rs
+++ b/src/cargo/core/resolver/resolve.rs
@@ -84,13 +84,14 @@ pub enum ResolveVersion {
     /// branch specifiers.
     ///
     /// * Introduced in 2020 in version 1.47.
-    /// * New lockfiles use V3 by default starting in 1.53.
+    /// * New lockfiles use V3 by default from in 1.53 to 1.82.
     V3,
     /// SourceId URL serialization is aware of URL encoding. For example,
     /// `?branch=foo bar` is now encoded as `?branch=foo+bar` and can be decoded
     /// back and forth correctly.
     ///
     /// * Introduced in 2024 in version 1.78.
+    /// * New lockfiles use V4 by default starting in 1.83.
     V4,
     /// Unstable. Will collect a certain amount of changes and then go.
     ///
@@ -107,7 +108,7 @@ impl ResolveVersion {
     /// Update this and the description of enum variants of [`ResolveVersion`]
     /// when we're changing the default lockfile version.
     fn default() -> ResolveVersion {
-        ResolveVersion::V3
+        ResolveVersion::V4
     }
 
     /// The maximum version of lockfile made into the stable channel.
@@ -125,28 +126,23 @@ impl ResolveVersion {
             return ResolveVersion::default();
         };
 
-        let rust_1_41 = PartialVersion {
-            major: 1,
-            minor: Some(41),
-            patch: None,
-            pre: None,
-            build: None,
-        }
-        .try_into()
-        .expect("PartialVersion 1.41");
-        let rust_1_53 = PartialVersion {
-            major: 1,
-            minor: Some(53),
-            patch: None,
-            pre: None,
-            build: None,
-        }
-        .try_into()
-        .expect("PartialVersion 1.53");
+        let rust = |major, minor| -> RustVersion {
+            PartialVersion {
+                major,
+                minor: Some(minor),
+                patch: None,
+                pre: None,
+                build: None,
+            }
+            .try_into()
+            .unwrap()
+        };
 
-        if rust_version >= &rust_1_53 {
+        if rust_version >= &rust(1, 83) {
+            ResolveVersion::V4
+        } else if rust_version >= &rust(1, 53) {
             ResolveVersion::V3
-        } else if rust_version >= &rust_1_41 {
+        } else if rust_version >= &rust(1, 41) {
             ResolveVersion::V2
         } else {
             ResolveVersion::V1
diff --git a/src/cargo/core/source_id.rs b/src/cargo/core/source_id.rs
index 19ec9ca051c..53eb7f16f7e 100644
--- a/src/cargo/core/source_id.rs
+++ b/src/cargo/core/source_id.rs
@@ -644,10 +644,7 @@ impl fmt::Display for SourceId {
                 // Don't replace the URL display for git references,
                 // because those are kind of expected to be URLs.
                 write!(f, "{}", self.inner.url)?;
-                // TODO(-Znext-lockfile-bump): set it to true when the default is
-                // lockfile v4, because we want Source ID serialization to be
-                // consistent with lockfile.
-                if let Some(pretty) = reference.pretty_ref(false) {
+                if let Some(pretty) = reference.pretty_ref(true) {
                     write!(f, "?{}", pretty)?;
                 }
 
diff --git a/src/cargo/sources/git/source.rs b/src/cargo/sources/git/source.rs
index aa22eb3e439..7a6cc7851a1 100644
--- a/src/cargo/sources/git/source.rs
+++ b/src/cargo/sources/git/source.rs
@@ -226,12 +226,8 @@ fn ident_shallow(id: &SourceId, is_shallow: bool) -> String {
 impl<'gctx> Debug for GitSource<'gctx> {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         write!(f, "git repo at {}", self.remote.url())?;
-
-        // TODO(-Znext-lockfile-bump): set it to true when the default is
-        // lockfile v4, because we want Source ID serialization to be
-        // consistent with lockfile.
         match &self.locked_rev {
-            Revision::Deferred(git_ref) => match git_ref.pretty_ref(false) {
+            Revision::Deferred(git_ref) => match git_ref.pretty_ref(true) {
                 Some(s) => write!(f, " ({})", s),
                 None => Ok(()),
             },
diff --git a/src/cargo/util/toml_mut/dependency.rs b/src/cargo/util/toml_mut/dependency.rs
index b66fc56afbc..5e0e437e8f6 100644
--- a/src/cargo/util/toml_mut/dependency.rs
+++ b/src/cargo/util/toml_mut/dependency.rs
@@ -1002,11 +1002,7 @@ impl GitSource {
 impl std::fmt::Display for GitSource {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let git_ref = self.git_ref();
-
-        // TODO(-Znext-lockfile-bump): set it to true when the default is
-        // lockfile v4, because we want Source ID serialization to be
-        // consistent with lockfile.
-        if let Some(pretty_ref) = git_ref.pretty_ref(false) {
+        if let Some(pretty_ref) = git_ref.pretty_ref(true) {
             write!(f, "{}?{}", self.git, pretty_ref)
         } else {
             write!(f, "{}", self.git)
diff --git a/tests/testsuite/alt_registry.rs b/tests/testsuite/alt_registry.rs
index cc58f4ef0af..b001da4f85b 100644
--- a/tests/testsuite/alt_registry.rs
+++ b/tests/testsuite/alt_registry.rs
@@ -1790,7 +1790,7 @@ fn sparse_lockfile() {
         str![[r##"
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "a"
diff --git a/tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/Cargo.lock b/tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/Cargo.lock
index 8c304c1c338..b27519688c9 100644
--- a/tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/Cargo.lock
+++ b/tests/testsuite/cargo_add/add_workspace_non_fuzzy/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
diff --git a/tests/testsuite/cargo_add/locked_unchanged/in/Cargo.lock b/tests/testsuite/cargo_add/locked_unchanged/in/Cargo.lock
index b88709a9e9b..bfa9ea20706 100644
--- a/tests/testsuite/cargo_add/locked_unchanged/in/Cargo.lock
+++ b/tests/testsuite/cargo_add/locked_unchanged/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_add/lockfile_updated/in/Cargo.lock b/tests/testsuite/cargo_add/lockfile_updated/in/Cargo.lock
index d8fa962f306..0b048b97b20 100644
--- a/tests/testsuite/cargo_add/lockfile_updated/in/Cargo.lock
+++ b/tests/testsuite/cargo_add/lockfile_updated/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_add/lockfile_updated/out/Cargo.lock b/tests/testsuite/cargo_add/lockfile_updated/out/Cargo.lock
index e423b3d1f8b..da62406bdba 100644
--- a/tests/testsuite/cargo_add/lockfile_updated/out/Cargo.lock
+++ b/tests/testsuite/cargo_add/lockfile_updated/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/not_found/out/Cargo.lock b/tests/testsuite/cargo_info/not_found/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/not_found/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/not_found/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/path_dependency/in/Cargo.lock b/tests/testsuite/cargo_info/path_dependency/in/Cargo.lock
index 378b02cf7b7..4f842c40bfe 100644
--- a/tests/testsuite/cargo_info/path_dependency/in/Cargo.lock
+++ b/tests/testsuite/cargo_info/path_dependency/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "crate1"
diff --git a/tests/testsuite/cargo_info/path_dependency/out/Cargo.lock b/tests/testsuite/cargo_info/path_dependency/out/Cargo.lock
index 378b02cf7b7..4f842c40bfe 100644
--- a/tests/testsuite/cargo_info/path_dependency/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/path_dependency/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "crate1"
diff --git a/tests/testsuite/cargo_info/specify_version_within_ws_and_conflict_with_lockfile/out/Cargo.lock b/tests/testsuite/cargo_info/specify_version_within_ws_and_conflict_with_lockfile/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/specify_version_within_ws_and_conflict_with_lockfile/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/specify_version_within_ws_and_conflict_with_lockfile/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/specify_version_within_ws_and_match_with_lockfile/out/Cargo.lock b/tests/testsuite/cargo_info/specify_version_within_ws_and_match_with_lockfile/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/specify_version_within_ws_and_match_with_lockfile/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/specify_version_within_ws_and_match_with_lockfile/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/with_frozen_within_ws/out/Cargo.lock b/tests/testsuite/cargo_info/with_frozen_within_ws/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/with_frozen_within_ws/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/with_frozen_within_ws/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/with_locked_within_ws/out/Cargo.lock b/tests/testsuite/cargo_info/with_locked_within_ws/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/with_locked_within_ws/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/with_locked_within_ws/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_workspace.in/Cargo.lock b/tests/testsuite/cargo_info/within_workspace.in/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/within_workspace.in/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_workspace.in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_ws/out/Cargo.lock b/tests/testsuite/cargo_info/within_ws/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/within_ws/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_ws/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/in/Cargo.lock b/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/in/Cargo.lock
index cf3fed84f81..ac82f516e38 100644
--- a/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/in/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/out/Cargo.lock b/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/out/Cargo.lock
index cf3fed84f81..ac82f516e38 100644
--- a/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_ws_and_pick_ws_package/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_ws_with_alternative_registry/out/Cargo.lock b/tests/testsuite/cargo_info/within_ws_with_alternative_registry/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/within_ws_with_alternative_registry/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_ws_with_alternative_registry/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/within_ws_without_lockfile/out/Cargo.lock b/tests/testsuite/cargo_info/within_ws_without_lockfile/out/Cargo.lock
index 3d372c49933..58cfa016000 100644
--- a/tests/testsuite/cargo_info/within_ws_without_lockfile/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/within_ws_without_lockfile/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/without_requiring_registry_auth/in/Cargo.lock b/tests/testsuite/cargo_info/without_requiring_registry_auth/in/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/without_requiring_registry_auth/in/Cargo.lock
+++ b/tests/testsuite/cargo_info/without_requiring_registry_auth/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_info/without_requiring_registry_auth/out/Cargo.lock b/tests/testsuite/cargo_info/without_requiring_registry_auth/out/Cargo.lock
index e9ede42b3cb..f132b5ac5ae 100644
--- a/tests/testsuite/cargo_info/without_requiring_registry_auth/out/Cargo.lock
+++ b/tests/testsuite/cargo_info/without_requiring_registry_auth/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-list-test-fixture"
diff --git a/tests/testsuite/cargo_remove/gc_patch/out/Cargo.lock b/tests/testsuite/cargo_remove/gc_patch/out/Cargo.lock
index 4a1467ba16d..518f5a9ab83 100644
--- a/tests/testsuite/cargo_remove/gc_patch/out/Cargo.lock
+++ b/tests/testsuite/cargo_remove/gc_patch/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
diff --git a/tests/testsuite/cargo_remove/update_lock_file/in/Cargo.lock b/tests/testsuite/cargo_remove/update_lock_file/in/Cargo.lock
index a4018e70eb4..261eef0e806 100644
--- a/tests/testsuite/cargo_remove/update_lock_file/in/Cargo.lock
+++ b/tests/testsuite/cargo_remove/update_lock_file/in/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-remove-test-fixture"
diff --git a/tests/testsuite/cargo_remove/update_lock_file/out/Cargo.lock b/tests/testsuite/cargo_remove/update_lock_file/out/Cargo.lock
index af60414ddad..3aa0ca7a5e7 100644
--- a/tests/testsuite/cargo_remove/update_lock_file/out/Cargo.lock
+++ b/tests/testsuite/cargo_remove/update_lock_file/out/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "cargo-remove-test-fixture"
diff --git a/tests/testsuite/git.rs b/tests/testsuite/git.rs
index acd0d35daaf..0fd25bf2db0 100644
--- a/tests/testsuite/git.rs
+++ b/tests/testsuite/git.rs
@@ -283,7 +283,7 @@ fn cargo_compile_git_dep_pull_request() {
         .with_stderr_data(str![[r#"
 [UPDATING] git repository `[ROOTURL]/dep1`
 [LOCKING] 1 package to latest compatible version
-[COMPILING] dep1 v0.5.0 ([ROOTURL]/dep1?rev=refs/pull/330/head#[..])
+[COMPILING] dep1 v0.5.0 ([ROOTURL]/dep1?rev=refs%2Fpull%2F330%2Fhead#[..])
 [COMPILING] foo v0.0.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
diff --git a/tests/testsuite/lockfile_compat.rs b/tests/testsuite/lockfile_compat.rs
index 18ec5bc2d8f..4a24993b160 100644
--- a/tests/testsuite/lockfile_compat.rs
+++ b/tests/testsuite/lockfile_compat.rs
@@ -21,7 +21,7 @@ fn oldest_lockfile_still_works_with_command(cargo_command: &str) {
     let expected_lockfile = str![[r##"
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
@@ -173,7 +173,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
         str![[r##"
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
@@ -407,7 +407,7 @@ fn current_lockfile_format() {
     let expected = str![[r##"
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
@@ -473,7 +473,7 @@ dependencies = [
         str![[r##"
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bar"
@@ -682,7 +682,7 @@ dependencies = [
                     name = "foo"
                     version = "0.0.1"
                     edition = "2015"
-                    authors = []
+                    rust-version = "1.81" # ensure it stays in lockfile v3
 
                     [dependencies]
                     dep1 = {{ git = '{}', branch = 'master' }}
@@ -937,38 +937,6 @@ Caused by:
         .run();
 }
 
-#[cargo_test]
-fn v4_cannot_be_created_from_scratch() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            &format!(
-                r#"
-                    [package]
-                    name = "foo"
-                    version = "0.0.1"
-                    edition = "2015"
-                "#,
-            ),
-        )
-        .file("src/lib.rs", "")
-        .build();
-
-    p.cargo("fetch").run();
-
-    let lockfile = r#"# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "foo"
-version = "0.0.1"
-"#;
-
-    let lock = p.read_lockfile();
-    assert_e2e().eq(&lock, lockfile);
-}
-
 fn create_branch(repo: &git2::Repository, branch: &str, head_id: git2::Oid) {
     repo.branch(branch, &repo.find_commit(head_id).unwrap(), true)
         .unwrap();
@@ -995,6 +963,7 @@ fn v3_and_git_url_encoded(ref_kind: &str, f: impl FnOnce(&git2::Repository, &str
     let head_id = repo.head().unwrap().target().unwrap();
     // Ref name with special characters
     let git_ref = "a-_+#$)";
+    let encoded_ref = "a-_%2B%23%24%29";
     f(&repo, git_ref, head_id);
 
     let lockfile = format!(
@@ -1025,6 +994,7 @@ dependencies = [
                     name = "foo"
                     version = "0.0.1"
                     edition = "2015"
+                    rust-version = "1.81" # ensure it stays in lockfile v3
 
                     [dependencies]
                     dep1 = {{ git = '{url}', {ref_kind} = '{git_ref}' }}
@@ -1040,8 +1010,8 @@ dependencies = [
             "\
 [UPDATING] git repository `[ROOTURL]/dep1`
 [LOCKING] 1 package to latest compatible version
-[ADDING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={git_ref}#[..])
-[CHECKING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={git_ref}#[..])
+[ADDING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={encoded_ref}#[..])
+[CHECKING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={encoded_ref}#[..])
 [CHECKING] foo v0.0.1 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 "
@@ -1135,8 +1105,8 @@ dependencies = [
             "\
 [UPDATING] git repository `[ROOTURL]/dep1`
 [LOCKING] 1 package to latest compatible version
-[ADDING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={git_ref}#[..])
-[CHECKING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={git_ref}#[..])
+[ADDING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={encoded_ref}#[..])
+[CHECKING] dep1 v0.5.0 ([ROOTURL]/dep1?{ref_kind}={encoded_ref}#[..])
 [CHECKING] foo v0.0.1 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 "
@@ -1175,6 +1145,26 @@ fn v4_and_git_url_encoded_rev() {
 #[cargo_test]
 fn with_msrv() {
     let cksum = Package::new("bar", "0.1.0").publish();
+
+    let v3_lockfile = format!(
+        r#"# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "bar"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "{cksum}"
+
+[[package]]
+name = "foo"
+version = "0.0.1"
+dependencies = [
+ "bar",
+]
+"#
+    );
     let v2_lockfile = format!(
         r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
@@ -1258,6 +1248,14 @@ dependencies = [
         ("1.53", Some(4), 4),
         // v4 introduced
         ("1.78", None, 3),
+        // last version of v3 as the default
+        ("1.82", None, 3),
+        // v4 is the default
+        ("1.83", None, 4),
+        ("1.83", Some(1), 1),
+        ("1.83", Some(2), 2),
+        ("1.83", Some(3), 3),
+        ("1.83", Some(4), 4),
     ];
 
     for (msrv, existing_lockfile, expected_version) in cases {
@@ -1284,6 +1282,7 @@ dependencies = [
             let existing_lockfile = match existing_lockfile {
                 1 => v1_lockfile.as_str().into(),
                 2 => v2_lockfile.as_str().into(),
+                3 => v3_lockfile.as_str().into(),
                 v => std::borrow::Cow::from(format!("version = {v}")),
             };
             p.change_file("Cargo.lock", &existing_lockfile);
diff --git a/tests/testsuite/lockfile_path.rs b/tests/testsuite/lockfile_path.rs
index f7f513859e6..c1b698e402a 100644
--- a/tests/testsuite/lockfile_path.rs
+++ b/tests/testsuite/lockfile_path.rs
@@ -441,7 +441,7 @@ fn run_embed() {
 }
 
 const VALID_LOCKFILE: &str = r#"# Test lockfile
-version = 3
+version = 4
 
 [[package]]
 name = "test_foo"
diff --git a/tests/testsuite/package.rs b/tests/testsuite/package.rs
index 1ddc09aa2c3..d5c9ea26eaf 100644
--- a/tests/testsuite/package.rs
+++ b/tests/testsuite/package.rs
@@ -3104,7 +3104,7 @@ path = "src/main.rs"
     );
     let cargo_lock_contents = r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "foo"
@@ -3206,7 +3206,7 @@ path = "src/main.rs"
     );
     let cargo_lock_contents = r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "foo"
@@ -3321,7 +3321,7 @@ path = "src/main.rs"
     );
     let cargo_lock_contents = r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "foo"
@@ -5241,7 +5241,7 @@ fn workspace_with_local_deps_nightly() {
     let generated_lock = format!(
         r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "level1"
@@ -5767,7 +5767,7 @@ fn workspace_with_local_deps_alternative_index() {
     let generated_lock = format!(
         r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "level1"
diff --git a/tests/testsuite/publish.rs b/tests/testsuite/publish.rs
index 6ddc33989b7..2ee6639743d 100644
--- a/tests/testsuite/publish.rs
+++ b/tests/testsuite/publish.rs
@@ -1606,7 +1606,7 @@ You may press ctrl-c to skip waiting; the crate should be available shortly.
                 // The important check here is that it is 1.0.1 in the registry.
                 "# This file is automatically @generated by Cargo.\n\
                  # It is not intended for manual editing.\n\
-                 version = 3\n\
+                 version = 4\n\
                  \n\
                  [[package]]\n\
                  name = \"dep1\"\n\