diff --git a/lib/bundler/self_manager.rb b/lib/bundler/self_manager.rb
index 5d7546e926..1925a266d9 100644
--- a/lib/bundler/self_manager.rb
+++ b/lib/bundler/self_manager.rb
@@ -170,6 +170,8 @@ module Bundler
 
       parsed_version = Bundler::LockfileParser.bundled_with
       @lockfile_version = parsed_version ? Gem::Version.new(parsed_version) : nil
+    rescue ArgumentError
+      @lockfile_version = nil
     end
 
     def restart_version
diff --git a/spec/bundler/runtime/self_management_spec.rb b/spec/bundler/runtime/self_management_spec.rb
index 976437c332..3e49db4f32 100644
--- a/spec/bundler/runtime/self_management_spec.rb
+++ b/spec/bundler/runtime/self_management_spec.rb
@@ -129,6 +129,13 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev", :realworld => tru
       expect(out).to eq(Bundler::VERSION[0] == "2" ? "Bundler version #{Bundler::VERSION}" : Bundler::VERSION)
     end
 
+    it "ignores malformed lockfile version" do
+      lockfile_bundled_with("2.3.")
+
+      bundle "install --verbose"
+      expect(out).to include("Using bundler #{Bundler::VERSION}")
+    end
+
     private
 
     def lockfile_bundled_with(version)