diff --git a/internal/resolver/resolver.go b/internal/resolver/resolver.go
index 9c65d2965..5bd697e55 100644
--- a/internal/resolver/resolver.go
+++ b/internal/resolver/resolver.go
@@ -18,6 +18,7 @@ package resolver
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -57,7 +58,15 @@ func (r *Resolver) Resolve(reqs []*chart.Dependency, repoNames map[string]string
 	locked := make([]*chart.Dependency, len(reqs))
 	missing := []string{}
 	for i, d := range reqs {
-		constraint, err := semver.NewConstraint(d.Version)
+		v := d.Version
+		if len(strings.TrimSpace(v)) == 0 {
+			if !strings.HasPrefix(d.Repository, "file://") {
+				return nil, fmt.Errorf("dependency %q must has a version", d.Name)
+			}
+			v = "*"
+		}
+
+		constraint, err := semver.NewConstraint(v)
 		if err != nil {
 			return nil, errors.Wrapf(err, "dependency %q has an invalid version/constraint format", d.Name)
 		}
diff --git a/internal/resolver/resolver_test.go b/internal/resolver/resolver_test.go
index bc84ba952..91614110e 100644
--- a/internal/resolver/resolver_test.go
+++ b/internal/resolver/resolver_test.go
@@ -135,6 +135,29 @@ func TestResolve(t *testing.T) {
 			},
 			err: true,
 		},
+		{
+			name: "optional dependencise version",
+			req: []*chart.Dependency{
+				{Name: "base", Repository: "file://base", Version: ""},
+			},
+			expect: &chart.Lock{
+				Dependencies: []*chart.Dependency{
+					{Name: "base", Repository: "file://base", Version: "0.1.0"},
+				},
+			},
+		},
+		{
+			name: "required dependency version",
+			req: []*chart.Dependency{
+				{Name: "alpine", Repository: "http://example.com", Version: ""},
+			},
+			expect: &chart.Lock{
+				Dependencies: []*chart.Dependency{
+					{Name: "alpine", Repository: "http://example.com", Version: "0.2.0"},
+				},
+			},
+			err: true,
+		},
 	}
 
 	repoNames := map[string]string{"alpine": "kubernetes-charts", "redis": "kubernetes-charts"}