2 files changed, 43 insertions, 0 deletions
diff --git a/lib/bundler/source/git/git_proxy.rb b/lib/bundler/source/git/git_proxy.rb
index 3a6a666627..926c9b8ead 100644
--- a/lib/bundler/source/git/git_proxy.rb
+++ b/lib/bundler/source/git/git_proxy.rb
@@ -366,6 +366,11 @@ module Bundler
           args += ["--single-branch"]
           args.unshift("--no-tags") if supports_cloning_with_no_tags?
 
+          # If there's a locked revision, no need to clone any specific branch
+          # or tag, since we will end up checking out that locked revision
+          # anyways.
+          return args if @revision
+
           args += ["--branch", branch || tag] if branch || tag
           args
         end
diff --git a/spec/bundler/commands/lock_spec.rb b/spec/bundler/commands/lock_spec.rb
index f0c3537d2f..a148d6dd19 100644
--- a/spec/bundler/commands/lock_spec.rb
+++ b/spec/bundler/commands/lock_spec.rb
@@ -158,6 +158,44 @@ RSpec.describe "bundle lock" do
     expect(out).not_to include("re-resolving dependencies because the list of sources changed")
   end
 
+  it "updates specific gems using --update using the locked revision of unrelated git gems for resolving" do
+    ref = build_git("foo").ref_for("HEAD")
+
+    gemfile <<-G
+      source "#{file_uri_for(gem_repo1)}"
+      gem "rake"
+      gem "foo", :git => "#{file_uri_for(lib_path("foo-1.0"))}", :branch => "deadbeef"
+    G
+
+    lockfile <<~L
+      GIT
+        remote: #{file_uri_for(lib_path("foo-1.0"))}
+        revision: #{ref}
+        branch: deadbeef
+        specs:
+          foo (1.0)
+
+      GEM
+        remote: #{file_uri_for(gem_repo1)}/
+        specs:
+          rake (10.0.1)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        foo!
+        rake
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
+    bundle "lock --update rake --verbose"
+    expect(out).to match(/Writing lockfile to.+lock/)
+    expect(lockfile).to include("rake (13.0.1)")
+  end
+
   it "errors when updating a missing specific gems using --update" do
     lockfile @lockfile