diff --git a/plugins/plugins.go b/plugins/plugins.go
index 6d3a8d0c6b..efab5e629a 100644
--- a/plugins/plugins.go
+++ b/plugins/plugins.go
@@ -12,16 +12,16 @@ import (
 
 	"github.com/gorilla/mux"
 
-	"github.com/open-policy-agent/opa/v1/ast"
-	"github.com/open-policy-agent/opa/v1/bundle"
-	"github.com/open-policy-agent/opa/v1/hooks"
-	"github.com/open-policy-agent/opa/v1/loader"
-	"github.com/open-policy-agent/opa/v1/logging"
+	"github.com/open-policy-agent/opa/ast"
+	"github.com/open-policy-agent/opa/bundle"
+	"github.com/open-policy-agent/opa/hooks"
+	"github.com/open-policy-agent/opa/loader"
+	"github.com/open-policy-agent/opa/logging"
+	"github.com/open-policy-agent/opa/resolver/wasm"
+	"github.com/open-policy-agent/opa/storage"
+	"github.com/open-policy-agent/opa/topdown/print"
+	"github.com/open-policy-agent/opa/tracing"
 	v1 "github.com/open-policy-agent/opa/v1/plugins"
-	"github.com/open-policy-agent/opa/v1/resolver/wasm"
-	"github.com/open-policy-agent/opa/v1/storage"
-	"github.com/open-policy-agent/opa/v1/topdown/print"
-	"github.com/open-policy-agent/opa/v1/tracing"
 )
 
 // Factory defines the interface OPA uses to instantiate your plugin.
@@ -92,7 +92,7 @@ type Triggerable = v1.Triggerable
 
 // State defines the state that a Plugin instance is currently
 // in with pre-defined states.
-type State v1.State
+type State = v1.State
 
 const (
 	// StateNotReady indicates that the Plugin is not in an error state, but isn't
@@ -252,5 +252,15 @@ func WithTelemetryGatherers(gs map[string]report.Gatherer) func(*Manager) {
 
 // New creates a new Manager using config.
 func New(raw []byte, id string, store storage.Store, opts ...func(*Manager)) (*Manager, error) {
-	return v1.New(raw, id, store, opts...)
+	options := make([]func(*Manager), 0, len(opts)+1)
+	options = append(options, opts...)
+	options = append(opts, func(m *Manager) {
+		if m.ParserOptions().RegoVersion == ast.RegoUndefined {
+			cpy := m.ParserOptions()
+			cpy.RegoVersion = ast.DefaultRegoVersion
+			WithParserOptions(cpy)(m)
+		}
+	})
+
+	return v1.New(raw, id, store, options...)
 }
diff --git a/plugins/plugins_test.go b/plugins/plugins_test.go
new file mode 100644
index 0000000000..c453549de5
--- /dev/null
+++ b/plugins/plugins_test.go
@@ -0,0 +1,47 @@
+// Copyright 2024 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package plugins
+
+import (
+	"testing"
+
+	"github.com/open-policy-agent/opa/storage/inmem"
+	"github.com/open-policy-agent/opa/v1/ast"
+)
+
+func TestNew_DefaultRegoVersion(t *testing.T) {
+	popts := ast.ParserOptions{
+		Capabilities: &ast.Capabilities{
+			Features: []string{
+				"my_custom_feature",
+			},
+		},
+		ProcessAnnotation: true,
+		AllFutureKeywords: true,
+		FutureKeywords:    []string{"foo", "bar"},
+	}
+	m, err := New([]byte(`{"plugins": {"someplugin": {}}}`), "test", inmem.New(),
+		WithParserOptions(popts))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if exp, act := ast.RegoV0, m.ParserOptions().RegoVersion; exp != act {
+		t.Fatalf("Expected default Rego version to be %v but got %v", exp, act)
+	}
+
+	// Check a couple of other options to make sure they haven't changed
+	if exp, act := popts.ProcessAnnotation, m.ParserOptions().ProcessAnnotation; exp != act {
+		t.Fatalf("Expected ProcessAnnotation to be %v but got %v", exp, act)
+	}
+
+	if exp, act := popts.AllFutureKeywords, m.ParserOptions().AllFutureKeywords; exp != act {
+		t.Fatalf("Expected AllFutureKeywords to be %v but got %v", exp, act)
+	}
+
+	if exp, act := popts.Capabilities, m.ParserOptions().Capabilities; exp != act {
+		t.Fatalf("Expected Capabilities to be %v but got %v", exp, act)
+	}
+}