diff --git a/Dockerfile b/Dockerfile
index 9f35069d08..491f25b71b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -166,10 +166,11 @@ RUN wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb \
 
 ### RUST
 
-# Install Rust 1.37.0
+# Install Rust 1.47.0
 ENV RUSTUP_HOME=/opt/rust \
   PATH="${PATH}:/opt/rust/bin"
 RUN export CARGO_HOME=/opt/rust ; curl https://sh.rustup.rs -sSf | sh -s -- -y
+RUN export CARGO_HOME=/opt/rust ; rustup toolchain install 1.47.0 && rustup default 1.47.0
 
 
 ### NEW NATIVE HELPERS
diff --git a/cargo/spec/dependabot/cargo/file_updater/lockfile_updater_spec.rb b/cargo/spec/dependabot/cargo/file_updater/lockfile_updater_spec.rb
index 1663c3554d..56b69d5d9d 100644
--- a/cargo/spec/dependabot/cargo/file_updater/lockfile_updater_spec.rb
+++ b/cargo/spec/dependabot/cargo/file_updater/lockfile_updater_spec.rb
@@ -95,10 +95,14 @@
         expect(updated_lockfile_content).
           to include(%(name = "time"\nversion = "0.1.40"))
         expect(updated_lockfile_content).to include(
-          "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+          <<~CHECKSUM
+            checksum = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+          CHECKSUM
         )
         expect(updated_lockfile_content).to_not include(
-          "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
+          <<~CHECKSUM
+            checksum = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
+          CHECKSUM
         )
       end
 
@@ -183,6 +187,20 @@
         end
       end
 
+      context "with an old format lockfile" do
+        let(:manifest_fixture_name) { "old_lockfile" }
+        let(:lockfile_fixture_name) { "old_lockfile" }
+
+        it "updates the lockfile to the new version" do
+          expect(updated_lockfile_content).to include(
+            <<~CHECKSUM
+              checksum = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+            CHECKSUM
+          )
+          expect(updated_lockfile_content).to_not include("[metadata]")
+        end
+      end
+
       context "with a git dependency" do
         let(:manifest_fixture_name) { "git_dependency" }
         let(:lockfile_fixture_name) { "git_dependency" }
@@ -238,14 +256,6 @@
                          "8d38a931b7e34f9da339c058cbbca6ded624ea58")
             expect(updated_lockfile_content).to_not include("git+https://")
 
-            expect(updated_lockfile_content).to include(
-              "[metadata]\n"\
-              '"checksum utf8-ranges 1.0.4 (git+ssh://git@github.com/'\
-              "BurntSushi/utf8-ranges)\" = \"<none>\"\n"\
-              '"checksum utf8-ranges-parent 1.0.2 (git+ssh://git@github.com/'\
-              "dependabot-fixtures/utf8-ranges)\" = \"<none>\""
-            )
-
             content = updated_lockfile_content
             expect(content.scan(/name = "utf8-ranges"/).count).to eq(1)
           end
diff --git a/cargo/spec/fixtures/lockfiles/bare_version_specified b/cargo/spec/fixtures/lockfiles/bare_version_specified
index 9abb9db0e4..f5237db605 100644
--- a/cargo/spec/fixtures/lockfiles/bare_version_specified
+++ b/cargo/spec/fixtures/lockfiles/bare_version_specified
@@ -5,6 +5,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
+checksum = "f5314d38125dc9b9ca99ed19a516eb19feac7bf8b22b5b32993c971bf8cb2a4d"
 
 [[package]]
 name = "dependabot"
@@ -22,11 +23,13 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
+checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 
 [[package]]
 name = "libc"
 version = "0.2.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
 
 [[package]]
 name = "memchr"
@@ -35,11 +38,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
+checksum = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
 
 [[package]]
 name = "redox_syscall"
 version = "0.1.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d92eecebad22b767915e4d529f89f28ee96dbbf5a4810d2b844373f136417fd"
 
 [[package]]
 name = "regex"
@@ -50,11 +55,13 @@ dependencies = [
  "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
+checksum = "4499ef755e709fbfe334ecbc3206537e84952ead5347791b0f54c2b75fe63a28"
 
 [[package]]
 name = "regex-syntax"
 version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a21935ce5a4dfa48e3ded1aefbbe353fb9ab258b0d3fa0bd168bef00797b3dc7"
 
 [[package]]
 name = "time"
@@ -66,25 +73,16 @@ dependencies = [
  "redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
+checksum = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
 
 [[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 
 [[package]]
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f5314d38125dc9b9ca99ed19a516eb19feac7bf8b22b5b32993c971bf8cb2a4d"
-"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
-"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
-"checksum redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "0d92eecebad22b767915e4d529f89f28ee96dbbf5a4810d2b844373f136417fd"
-"checksum regex 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)" = "4499ef755e709fbfe334ecbc3206537e84952ead5347791b0f54c2b75fe63a28"
-"checksum regex-syntax 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a21935ce5a4dfa48e3ded1aefbbe353fb9ab258b0d3fa0bd168bef00797b3dc7"
-"checksum time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/cargo/spec/fixtures/lockfiles/blank_version b/cargo/spec/fixtures/lockfiles/blank_version
index 9abb9db0e4..ec19afc37c 100644
--- a/cargo/spec/fixtures/lockfiles/blank_version
+++ b/cargo/spec/fixtures/lockfiles/blank_version
@@ -76,15 +76,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f5314d38125dc9b9ca99ed19a516eb19feac7bf8b22b5b32993c971bf8cb2a4d"
-"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
-"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
-"checksum redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "0d92eecebad22b767915e4d529f89f28ee96dbbf5a4810d2b844373f136417fd"
-"checksum regex 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)" = "4499ef755e709fbfe334ecbc3206537e84952ead5347791b0f54c2b75fe63a28"
-"checksum regex-syntax 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a21935ce5a4dfa48e3ded1aefbbe353fb9ab258b0d3fa0bd168bef00797b3dc7"
-"checksum time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/cargo/spec/fixtures/lockfiles/build_version b/cargo/spec/fixtures/lockfiles/build_version
index aea1d76630..77cfc2c91d 100644
--- a/cargo/spec/fixtures/lockfiles/build_version
+++ b/cargo/spec/fixtures/lockfiles/build_version
@@ -75,15 +75,3 @@ dependencies = [
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
-
-[metadata]
-"checksum base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "30e93c03064e7590d0466209155251b90c22e37fab1daf2771582598b5827557"
-"checksum blob 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "122c3fa3949d822d2a51c648db9e8105d6e75b89dc628cc366901d3d396fa4f4"
-"checksum byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "90492c5858dd7d2e78691cfb89f90d273a2800fc11d98f60786e5d87e2f83781"
-"checksum gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)" = "5e33ec290da0d127825013597dbdfc28bee4964690c7ce1166cbc2a7bd08b1bb"
-"checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
-"checksum libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)" = "76e3a3ef172f1a0b9a9ff0dd1491ae5e6c948b94479a3021819ba7d860c8645d"
-"checksum serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)" = "92ec94e2754699adddbbc4f555791bd3acc2a2f5574cba16c93a4a9cf4a04415"
-"checksum zstd 0.4.19+zstd.1.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e44f036c43e506ce5651cad4f340af6b0b6d405a1c440e4a553bc422df7a81a2"
-"checksum zstd-safe 1.4.4+zstd.1.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "9291dbf678d18ace21725e3409d07e0a80d512feb75f5e27ac472a4948e5ddd1"
-"checksum zstd-sys 1.4.4+zstd.1.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "de44a435b7bb72cb779af17a72d6e9dc039dbb11a85fa2f79abf4a74dc73c013"
diff --git a/cargo/spec/fixtures/lockfiles/dev_dependencies b/cargo/spec/fixtures/lockfiles/dev_dependencies
index 96482c8b9e..e11b561e8b 100644
--- a/cargo/spec/fixtures/lockfiles/dev_dependencies
+++ b/cargo/spec/fixtures/lockfiles/dev_dependencies
@@ -118,21 +118,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66"
-"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
-"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
-"checksum redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "0d92eecebad22b767915e4d529f89f28ee96dbbf5a4810d2b844373f136417fd"
-"checksum regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)" = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f"
-"checksum regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
-"checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
-"checksum thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"
-"checksum time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "a15375f1df02096fb3317256ce2cee6a1f42fc84ea5ad5fc8c421cfe40c73098"
-"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/cargo/spec/fixtures/lockfiles/feature_dependency b/cargo/spec/fixtures/lockfiles/feature_dependency
index 5644e9fb0d..71a9110d6a 100644
--- a/cargo/spec/fixtures/lockfiles/feature_dependency
+++ b/cargo/spec/fixtures/lockfiles/feature_dependency
@@ -286,32 +286,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum atk-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "33a67fd81e1922dddc335887516f2f5254534e89c9d39fa89bca5d79bd150d34"
-"checksum bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"
-"checksum c_vec 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6237ac5a4b1e81c213c24c6437964c61e646df910a914b4ab1487b46df20bd13"
-"checksum cairo-rs 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b6b5695f59fd036fe5741bc5a4eb20c78fbe42256e3b08a2af26bbcbe8070bf3"
-"checksum cairo-sys-rs 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c6e18fecaeac51809db57f45f4553cc0975225a7eb435a7a7e91e5e8113a84d"
-"checksum gdk 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a1e51db95be6565011bcd5cd99f9b17fdd585001057a999b21e09f1e8c28deb9"
-"checksum gdk-pixbuf 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "16160d212ae91abe9f3324c3fb233929ba322dde63585d15cda3336f8c529ed1"
-"checksum gdk-pixbuf-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "798f97101eea8180da363d0e80e07ec7ec6d1809306601c0100c1de5bc8b4f52"
-"checksum gdk-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d4ee916f5f25c5f4b21bd9dcb12a216ae697406940ff9476358c308a8ececada"
-"checksum gio 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "84ba5a2beb559059a0c9c2bd3681743cdede8d9a36c775840bca800333b22867"
-"checksum gio-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a303bbf7a5e75ab3b627117ff10e495d1b9e97e1d68966285ac2b1f6270091bc"
-"checksum glib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b9b0452824cc63066940f01adc721804919f0b76cdba3cfab977b00b87f16d4a"
-"checksum glib-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d9693049613ff52b93013cc3d2590366d8e530366d288438724b73f6c7dc4be8"
-"checksum gobject-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "60d507c87a71b1143c66ed21a969be9b99a76df234b342d733e787e6c9c7d7c2"
-"checksum gtk 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0847c507e52c1feaede13ef56fb4847742438602655449d5f1f782e8633f146f"
-"checksum gtk-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "905fcfbaaad1b44ec0b4bba9e4d527d728284c62bc2ba41fccedace2b096766f"
-"checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
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index 5adb4e54fd..2c90db534b 100644
--- a/cargo/spec/fixtures/lockfiles/feature_removed
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index b47a9d6ad2..b204b91a00 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency
+++ b/cargo/spec/fixtures/lockfiles/git_dependency
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index 5395954667..7b1896420c 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency_ssh
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index 4c5106734a..29df5a6a49 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency_unfetchable_ref
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index 4dd66280fa..8c3b1abdac 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency_update_blocked
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diff --git a/cargo/spec/fixtures/lockfiles/git_dependency_with_tag b/cargo/spec/fixtures/lockfiles/git_dependency_with_tag
index 3f38815481..046152615c 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency_with_tag
+++ b/cargo/spec/fixtures/lockfiles/git_dependency_with_tag
@@ -9,6 +9,3 @@ dependencies = [
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diff --git a/cargo/spec/fixtures/lockfiles/git_dependency_with_unreachable_branch b/cargo/spec/fixtures/lockfiles/git_dependency_with_unreachable_branch
index 1a279780b6..08b7fff4c5 100644
--- a/cargo/spec/fixtures/lockfiles/git_dependency_with_unreachable_branch
+++ b/cargo/spec/fixtures/lockfiles/git_dependency_with_unreachable_branch
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diff --git a/cargo/spec/fixtures/lockfiles/git_subdependency b/cargo/spec/fixtures/lockfiles/git_subdependency
index f16e0b524c..9ba9ffaa8e 100644
--- a/cargo/spec/fixtures/lockfiles/git_subdependency
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diff --git a/cargo/spec/fixtures/lockfiles/mdBook b/cargo/spec/fixtures/lockfiles/mdBook
index 874237cf63..33fae6a329 100644
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-"checksum regex 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "bc2a4457b0c25dae6fee3dcd631ccded31e97d689b892c26554e096aa08dd136"
-"checksum regex-syntax 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "aa7523743a36e7aff26042364f7695ab6a4eb318f7a0e95a57ffe130e9321fbb"
-"checksum safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e27a8b19b835f7aea908818e871f5cc3a5a186550c30773be987e155e8163d8f"
-"checksum schannel 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "fbaffce35eb61c5b00846e73128b0cd62717e7c0ec46abbec132370d013975b4"
-"checksum socket2 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "71ebbe82fcdd697244ba7fe6e05e63b5c45910c3927e28469a04947494ff48d8"
-"checksum time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "a15375f1df02096fb3317256ce2cee6a1f42fc84ea5ad5fc8c421cfe40c73098"
-"checksum vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9e0a7d8bed3178a8fb112199d466eeca9ed09a14ba8ad67718179b4fd5487d0b"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/cargo/spec/fixtures/lockfiles/target_dependency b/cargo/spec/fixtures/lockfiles/target_dependency
index 1782c54480..9162661c16 100644
--- a/cargo/spec/fixtures/lockfiles/target_dependency
+++ b/cargo/spec/fixtures/lockfiles/target_dependency
@@ -97,18 +97,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66"
-"checksum gcc 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "08fa0b80a2193b08b8d38acb18d0cdb9ff00a287389bb59e685d907d1b4bf072"
-"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)" = "bedcc7a809076656486ffe045abeeac163da1b558e963a31e29fbfbeba916917"
-"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
-"checksum regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)" = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f"
-"checksum regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
-"checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
-"checksum thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"
-"checksum time 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "615f31b68e20d17a912d0a91a398b9bd2ee7eb7c5b02d8c67589b898bbb38216"
-"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/cargo/spec/fixtures/lockfiles/virtual_workspace b/cargo/spec/fixtures/lockfiles/virtual_workspace
index 28a48542a8..2087373ec3 100644
--- a/cargo/spec/fixtures/lockfiles/virtual_workspace
+++ b/cargo/spec/fixtures/lockfiles/virtual_workspace
@@ -31,7 +31,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
-
-[metadata]
-"checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-"checksum log 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b3a89a0c46ba789b8a247d4c567aed4d7c68e624672d238b45cc3ec20dc9f940"
diff --git a/cargo/spec/fixtures/lockfiles/virtual_workspace_old_format b/cargo/spec/fixtures/lockfiles/virtual_workspace_old_format
index 10e2d95c1c..a4fbc5cc31 100644
--- a/cargo/spec/fixtures/lockfiles/virtual_workspace_old_format
+++ b/cargo/spec/fixtures/lockfiles/virtual_workspace_old_format
@@ -31,7 +31,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
-
-[metadata]
-"checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-"checksum log 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b3a89a0c46ba789b8a247d4c567aed4d7c68e624672d238b45cc3ec20dc9f940"
diff --git a/cargo/spec/fixtures/lockfiles/workspace b/cargo/spec/fixtures/lockfiles/workspace
index d539eb7143..1f0b8d3a53 100644
--- a/cargo/spec/fixtures/lockfiles/workspace
+++ b/cargo/spec/fixtures/lockfiles/workspace
@@ -102,18 +102,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
-"checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-"checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
-"checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
-"checksum log 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b3a89a0c46ba789b8a247d4c567aed4d7c68e624672d238b45cc3ec20dc9f940"
-"checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
-"checksum regex 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "aec3f58d903a7d2a9dc2bf0e41a746f4530e0cab6b615494e058f67a3ef947fb"
-"checksum regex-syntax 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b2550876c31dc914696a6c2e01cbce8afba79a93c8ae979d2fe051c0230b3756"
-"checksum thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "279ef31c19ededf577bfd12dfae728040a21f635b06a24cd670ff510edd38963"
-"checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"
-"checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
-"checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
-"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
diff --git a/cargo/spec/fixtures/lockfiles/workspace_with_patch b/cargo/spec/fixtures/lockfiles/workspace_with_patch
index 3e1d4b311f..9f70451dc6 100644
--- a/cargo/spec/fixtures/lockfiles/workspace_with_patch
+++ b/cargo/spec/fixtures/lockfiles/workspace_with_patch
@@ -107,18 +107,3 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "log"
 version = "0.4.1"
 source = "git+https://github.com/rust-lang-nursery/log#08d0e4169d9107f0aaae885faeb09015706c95f2"
-
-[metadata]
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-"checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
-"checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
-"checksum libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd41f331ac7c5b8ac259b8bf82c75c0fb2e469bbf37d2becbba9a6a2221965b"
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-"checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
-"checksum regex 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "aec3f58d903a7d2a9dc2bf0e41a746f4530e0cab6b615494e058f67a3ef947fb"
-"checksum regex-syntax 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b2550876c31dc914696a6c2e01cbce8afba79a93c8ae979d2fe051c0230b3756"
-"checksum thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "279ef31c19ededf577bfd12dfae728040a21f635b06a24cd670ff510edd38963"
-"checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"
-"checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
-"checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
-"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
diff --git a/cargo/spec/fixtures/manifests/old_lockfile b/cargo/spec/fixtures/manifests/old_lockfile
new file mode 100644
index 0000000000..945aff320f
--- /dev/null
+++ b/cargo/spec/fixtures/manifests/old_lockfile
@@ -0,0 +1,8 @@
+[package]
+name = "dependabot" # the name of the package
+version = "0.1.0"    # the current version, obeying semver
+authors = ["support@dependabot.com"]
+
+[dependencies]
+time = "0.1.12"
+regex = "0.1.41"