diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c834d01..61d7de0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,12 +14,12 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version: [2.6, 2.7, "3.0", 3.1, 3.2]
-        bundler-version: [2.4.19, 2.4.22, 2.5.2]
+        bundler-version: [2.4.19, 2.4.22, 2.5.6]
         exclude:
           - ruby-version: 2.6
-            bundler-version: 2.5.2
+            bundler-version: 2.5.6
           - ruby-version: 2.7
-            bundler-version: 2.5.2
+            bundler-version: 2.5.6
     env:
       BUNDLER_VERSION: ${{ matrix.bundler-version }}
       BUNDLE_LOCKFILE: active
diff --git a/Gemfile.lock b/Gemfile.lock
index 8343aa0..5a21bfc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
       irb (~> 1.10)
       reline (>= 0.3.8)
     diff-lcs (1.5.0)
-    io-console (0.7.1)
+    io-console (0.7.2)
     irb (1.11.0)
       rdoc
       reline (>= 0.3.8)
@@ -31,7 +31,7 @@ GEM
     rdoc (6.6.2)
       psych (>= 4.0.0)
     regexp_parser (2.8.1)
-    reline (0.4.1)
+    reline (0.4.2)
       io-console (~> 0.5)
     rexml (3.2.6)
     rspec (3.12.0)
@@ -100,4 +100,4 @@ DEPENDENCIES
   stringio (~> 3.1)
 
 BUNDLED WITH
-   2.5.2
+   2.5.6
diff --git a/Gemfile.ruby-2.6.lock b/Gemfile.ruby-2.6.lock
index bbb39c3..02e5c86 100644
--- a/Gemfile.ruby-2.6.lock
+++ b/Gemfile.ruby-2.6.lock
@@ -11,11 +11,11 @@ GEM
       irb (>= 1.5.0)
       reline (>= 0.3.1)
     diff-lcs (1.5.0)
-    io-console (0.7.1)
+    io-console (0.7.2)
     irb (1.6.3)
       reline (>= 0.3.0)
     rake (13.0.6)
-    reline (0.4.1)
+    reline (0.4.2)
       io-console (~> 0.5)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
@@ -48,4 +48,4 @@ DEPENDENCIES
   stringio (= 3.0.6)
 
 BUNDLED WITH
-   2.5.2
+   2.5.6
diff --git a/lib/bundler/multilock.rb b/lib/bundler/multilock.rb
index d9ec544..79c2a9d 100644
--- a/lib/bundler/multilock.rb
+++ b/lib/bundler/multilock.rb
@@ -470,7 +470,12 @@ def write_lockfile(lockfile_definition, lockfile, install:, dependency_changes:
             resolved_remotely = true
           end
           SharedHelpers.capture_filesystem_access do
-            definition.lock(lockfile_definition[:lockfile], true)
+            if Bundler.gem_version >= Gem::Version.new("2.5.6")
+              definition.instance_variable_set(:@lockfile, lockfile_definition[:lockfile])
+              definition.lock(true)
+            else
+              definition.lock(lockfile_definition[:lockfile], true)
+            end
           end
         ensure
           Bundler.ui.level = previous_ui_level
@@ -495,6 +500,8 @@ def write_lockfile(lockfile_definition, lockfile, install:, dependency_changes:
   end
 end
 
+# see https://github.com/rubygems/rubygems/pull/7368
+Bundler::LazySpecification.include(Bundler::MatchMetadata) if defined?(Bundler::MatchMetadata)
 Bundler::Multilock.inject_preamble unless Bundler::Multilock.loaded?
 
 # this is terrible, but we can't prepend into these modules because we only load