diff --git a/adapter.go b/adapter.go
index 3687fb0..3aac5e5 100644
--- a/adapter.go
+++ b/adapter.go
@@ -450,3 +450,45 @@ func (a *Adapter) loadFilteredPolicy(model model.Model, filter *Filter, handler
 func (a *Adapter) IsFiltered() bool {
 	return a.filtered
 }
+
+// UpdatePolicy updates a policy rule from storage.
+// This is part of the Auto-Save feature.
+func (a *Adapter) UpdatePolicy(sec string, ptype string, oldRule, newPolicy []string) error {
+	return a.UpdatePolicies(sec, ptype, [][]string{oldRule}, [][]string{newPolicy})
+}
+
+// UpdatePolicies updates some policy rules to storage, like db, redis.
+func (a *Adapter) UpdatePolicies(sec string, ptype string, oldRules, newRules [][]string) error {
+	oldLines := make([]*CasbinRule, 0, len(oldRules))
+	newLines := make([]*CasbinRule, 0, len(newRules))
+	for _, rule := range oldRules {
+		oldLines = append(oldLines, savePolicyLine(ptype, rule))
+	}
+	for _, rule := range newRules {
+		newLines = append(newLines, savePolicyLine(ptype, rule))
+	}
+
+	return a.updatePolicies(oldLines, newLines)
+}
+
+func (a *Adapter) updatePolicies(oldLines, newLines []*CasbinRule) error {
+	tx, err := a.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Close()
+
+	for i, line := range oldLines {
+		newLines[i].ID = line.ID
+	}
+
+	_, err = tx.Model(&newLines).WherePK().Update()
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	if err = tx.Commit(); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/adapter_test.go b/adapter_test.go
index 2d599b7..d2d55dd 100644
--- a/adapter_test.go
+++ b/adapter_test.go
@@ -283,6 +283,22 @@ func (s *AdapterTestSuite) TestSavePolicyClearPreviousData() {
 	)
 }
 
+func (s *AdapterTestSuite) TestUpdatePolicy() {
+	var err error
+	s.e, err = casbin.NewEnforcer("examples/rbac_model.conf", "examples/rbac_policy.csv")
+	s.Require().NoError(err)
+
+	s.e.SetAdapter(s.a)
+
+	err = s.e.SavePolicy()
+	s.Require().NoError(err)
+
+	_, err = s.e.UpdatePolicies([][]string{{"alice", "data1", "read"}}, [][]string{{"bob", "data1", "read"}})
+	s.Require().NoError(err)
+
+	s.assertPolicy(s.e.GetPolicy(), [][]string{{"bob", "data1", "read"}, {"bob", "data2", "write"}, {"data2_admin", "data2", "read"}, {"data2_admin", "data2", "write"}})
+}
+
 func TestAdapterTestSuite(t *testing.T) {
 	suite.Run(t, new(AdapterTestSuite))
 }
diff --git a/go.mod b/go.mod
index 3fac4cc..e8f89aa 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,10 @@
 module github.com/casbin/casbin-pg-adapter
 
-go 1.12
+go 1.13
 
 require (
-	github.com/casbin/casbin/v2 v2.4.1
+	github.com/casbin/casbin/v2 v2.23.4
 	github.com/go-pg/pg/v9 v9.1.0
 	github.com/mmcloughlin/meow v0.0.0-20181112033425-871e50784daf
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.6.1
 )
diff --git a/go.sum b/go.sum
index 51c2a0a..afaecf4 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,7 @@
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible h1:1G1pk05UrOh0NlF1oeaaix1x8XzrfjIDK47TY0Zehcw=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/casbin/casbin v1.9.1 h1:ucjbS5zTrmSLtH4XogqOG920Poe6QatdXtz1FEbApeM=
-github.com/casbin/casbin/v2 v2.1.2 h1:bTwon/ECRx9dwBy2ewRVr5OiqjeXSGiTUY74sDPQi/g=
-github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
-github.com/casbin/casbin/v2 v2.4.1 h1:1dDJbnUoCTUu5ysFhaYND0yY8YReQ+GDQ7yDy5FNHyY=
-github.com/casbin/casbin/v2 v2.4.1/go.mod h1:XXtYGrs/0zlOsJMeRteEdVi/FsB0ph7KgNfjoCoJUD8=
+github.com/casbin/casbin/v2 v2.23.4 h1:izvAG3KA49C3/m1zpYfkLcZlkYQO5VeHj7dhwurwZR4=
+github.com/casbin/casbin/v2 v2.23.4/go.mod h1:wUgota0cQbTXE6Vd+KWpg41726jFRi7upxio0sR+Xd0=
 github.com/codemodus/kace v0.5.1 h1:4OCsBlE2c/rSJo375ggfnucv9eRzge/U5LrrOZd47HA=
 github.com/codemodus/kace v0.5.1/go.mod h1:coddaHoX1ku1YFSe4Ip0mL9kQjJvKkzb9CfIdG1YR04=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
@@ -21,6 +18,8 @@ github.com/go-pg/urlstruct v0.2.8 h1:pasKiKzYyAtJ9YEpGe6G+3PB0M5Ez0qsMtjSA3gsw/g
 github.com/go-pg/urlstruct v0.2.8/go.mod h1:/XKyiUOUUS3onjF+LJxbfmSywYAdl6qMfVbX33Q8rgg=
 github.com/go-pg/zerochecker v0.1.1 h1:av77Qe7Gs+1oYGGh51k0sbZ0bUaxJEdeP0r8YE64Dco=
 github.com/go-pg/zerochecker v0.1.1/go.mod h1:NJZ4wKL0NmTtz0GKCoJ8kym6Xn/EQzXRl2OnAe7MmDo=
+github.com/golang/mock v1.4.4 h1:l75CXGRSwbaYNpl/Z2X1XIIAMSCquvXgpVZDhwEIJsc=
+github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -43,8 +42,8 @@ github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1Cpa
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/vmihailenco/tagparser v0.1.0/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
 github.com/vmihailenco/tagparser v0.1.1 h1:quXMXlA39OCbd2wAdTsGDlK9RkOk6Wuw+x37wVyIuWY=
 github.com/vmihailenco/tagparser v0.1.1/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
@@ -56,11 +55,13 @@ golang.org/x/crypto v0.0.0-20191128160524-b544559bb6d1/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 h1:ULYEB3JvPRE/IfO+9uO7vKV/xzVTO7XPAwm8xbf4w2g=
 golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190420063019-afa5a82059c6/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -73,6 +74,7 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -83,9 +85,9 @@ gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMy
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 mellium.im/sasl v0.2.1 h1:nspKSRg7/SyO0cRGY71OkfHab8tf9kCts6a6oTDut0w=
 mellium.im/sasl v0.2.1/go.mod h1:ROaEDLQNuf9vjKqE1SrAfnsobm2YKXT1gnN1uDp1PjQ=