diff --git a/examples/jiralert.yml b/examples/jiralert.yml
index 46263c3..1a8029b 100644
--- a/examples/jiralert.yml
+++ b/examples/jiralert.yml
@@ -64,6 +64,11 @@ receivers:
       # MultiSelect
       customfield_10003: [{"value": "red"}, {"value": "blue"}, {"value": "green"}]
     #
+    # List of standard or custom field names which values will be updated. Optional.
+    update_always_fields:
+      - customfield_10001
+      - customfield_10003
+    #
     # Automatically resolve jira issues when alert is resolved. Optional. If declared, ensure state is not an empty string.
     auto_resolve:
       state: 'Done'
diff --git a/pkg/config/config.go b/pkg/config/config.go
index 7fc63c4..3c8dc9f 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -146,6 +146,7 @@ type ReceiverConfig struct {
 	Fields            map[string]interface{} `yaml:"fields" json:"fields"`
 	Components        []string               `yaml:"components" json:"components"`
 	StaticLabels      []string               `yaml:"static_labels" json:"static_labels"`
+	FieldsToUpdate    []string               `yaml:"update_always_fields" json:"update_always_fields"`
 
 	// Label copy settings
 	AddGroupLabels *bool `yaml:"add_group_labels" json:"add_group_labels"`
@@ -312,6 +313,9 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 				}
 			}
 		}
+		if len(c.Defaults.FieldsToUpdate) > 0 {
+			rc.FieldsToUpdate = c.Defaults.FieldsToUpdate
+		}
 		if len(c.Defaults.StaticLabels) > 0 {
 			rc.StaticLabels = append(rc.StaticLabels, c.Defaults.StaticLabels...)
 		}
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
index e0bd0c9..ac49db8 100644
--- a/pkg/config/config_test.go
+++ b/pkg/config/config_test.go
@@ -76,6 +76,10 @@ receivers:
       customfield_10002: { "value": "red" }
       # MultiSelect
       customfield_10003: [{"value": "red" }, {"value": "blue" }, {"value": "green" }]
+    # List of standard or custom field names which values will be updated. Optional.
+    update_always_fields:
+      - customfield_10001
+      - customfield_10003
 
 # File containing template definitions. Required.
 template: jiralert.tmpl
@@ -132,6 +136,7 @@ type receiverTestConfig struct {
 	AddGroupLabels    *bool    `yaml:"add_group_labels,omitempty"`
 	UpdateInComment   *bool    `yaml:"update_in_comment,omitempty"`
 	StaticLabels      []string `yaml:"static_labels" json:"static_labels"`
+	FieldsToUpdate    []string `yaml:"update_always_fields,omitempty"`
 
 	AutoResolve *AutoResolve `yaml:"auto_resolve" json:"auto_resolve"`
 
diff --git a/pkg/notify/notify.go b/pkg/notify/notify.go
index e4b96a2..5af8eac 100644
--- a/pkg/notify/notify.go
+++ b/pkg/notify/notify.go
@@ -91,6 +91,17 @@ func (r *Receiver) Notify(data *alertmanager.Data, hashJiraLabel bool, updateSum
 		issueDesc = issueDesc[:maxDescriptionLength]
 	}
 
+	issueCustomFields := tcontainer.NewMarshalMap()
+
+	for _, field := range r.conf.FieldsToUpdate {
+		if _, ok := r.conf.Fields[field]; ok {
+			issueCustomFields[field], err = deepCopyWithTemplate(r.conf.Fields[field], r.tmpl, data)
+			if err != nil {
+				return false, errors.Wrap(err, "render issue fields")
+			}
+		}
+	}
+
 	if issue != nil {
 
 		// Update summary if needed.
@@ -135,6 +146,19 @@ func (r *Receiver) Notify(data *alertmanager.Data, hashJiraLabel bool, updateSum
 			}
 		}
 
+		for field := range issueCustomFields {
+			if _, ok := issue.Fields.Unknowns[field]; ok {
+				if issue.Fields.Unknowns[field] != issueCustomFields[field] {
+					retry, err = r.updateUnknownFields(issue.Key, tcontainer.MarshalMap(map[string]interface{}{
+						field: issueCustomFields[field],
+					}))
+					if err != nil {
+						return retry, err
+					}
+				}
+			}
+		}
+
 		if len(data.Alerts.Firing()) == 0 {
 			if r.conf.AutoResolve != nil {
 				level.Debug(r.logger).Log("msg", "no firing alert; resolving issue", "key", issue.Key, "label", issueGroupLabel)
@@ -316,7 +340,7 @@ func (r *Receiver) search(projects []string, issueLabel string) (*jira.Issue, bo
 	projectList := "'" + strings.Join(projects, "', '") + "'"
 	query := fmt.Sprintf("project in(%s) and labels=%q order by resolutiondate desc", projectList, issueLabel)
 	options := &jira.SearchOptions{
-		Fields:     []string{"summary", "status", "resolution", "resolutiondate", "description", "comment"},
+		Fields:     append([]string{"summary", "status", "resolution", "resolutiondate", "description", "comment"}, r.conf.FieldsToUpdate...),
 		MaxResults: 2,
 	}
 
@@ -418,6 +442,21 @@ func (r *Receiver) addComment(issueKey string, content string) (bool, error) {
 	return false, nil
 }
 
+func (r *Receiver) updateUnknownFields(issueKey string, unknowns tcontainer.MarshalMap) (bool, error) {
+	level.Debug(r.logger).Log("msg", "updating issue with unknown fields", "key", issueKey, "unknowns", unknowns)
+
+	issueUpdate := &jira.Issue{
+		Key: issueKey,
+		Fields: &jira.IssueFields{
+			Unknowns: unknowns,
+		},
+	}
+	if _, resp, err := r.client.UpdateWithOptions(issueUpdate, nil); err != nil {
+		return handleJiraErrResponse("Issue.UpdateUnknownFields", resp, err, r.logger)
+	}
+	return false, nil
+}
+
 func (r *Receiver) reopen(issueKey string) (bool, error) {
 	return r.doTransition(issueKey, r.conf.ReopenState)
 }
diff --git a/pkg/notify/notify_test.go b/pkg/notify/notify_test.go
index 49d686f..c306a5f 100644
--- a/pkg/notify/notify_test.go
+++ b/pkg/notify/notify_test.go
@@ -56,6 +56,7 @@ func (f *fakeJira) Search(jql string, options *jira.SearchOptions) ([]jira.Issue
 	var issues []jira.Issue
 	for _, key := range f.keysByQuery[jql] {
 		issue := jira.Issue{Key: key, Fields: &jira.IssueFields{}}
+		issue.Fields.Unknowns = f.issuesByKey[key].Fields.Unknowns
 		for _, field := range options.Fields {
 			switch field {
 			case "summary":
@@ -132,6 +133,10 @@ func (f *fakeJira) UpdateWithOptions(old *jira.Issue, _ *jira.UpdateQueryOptions
 		issue.Fields.Description = old.Fields.Description
 	}
 
+	if old.Fields.Unknowns != nil {
+		issue.Fields.Unknowns = old.Fields.Unknowns
+	}
+
 	f.issuesByKey[issue.Key] = issue
 	return issue, nil, nil
 }
@@ -222,6 +227,21 @@ func testReceiverConfigWithStaticLabels() *config.ReceiverConfig {
 	}
 }
 
+func testReceiverConfigWithCustomFields() *config.ReceiverConfig {
+	reopen := config.Duration(1 * time.Hour)
+	return &config.ReceiverConfig{
+		Project:        "abc",
+		Summary:        `[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .GroupLabels.SortedPairs.Values | join " " }} {{ if gt (len .CommonLabels) (len .GroupLabels) }}({{ with .CommonLabels.Remove .GroupLabels.Names }}{{ .Values | join " " }}{{ end }}){{ end }}`,
+		ReopenDuration: &reopen,
+		ReopenState:    "reopened",
+		Description:    `{{ .Alerts.Firing | len }}`,
+		Fields: tcontainer.MarshalMap(map[string]interface{}{
+			"customfield_12345": `{{ (index .Alerts 0).Annotations.AlertValue }}`,
+		}),
+		FieldsToUpdate: []string{"customfield_12345", "non_existant_field"},
+	}
+}
+
 func TestNotify_JIRAInteraction(t *testing.T) {
 	testNowTime := time.Now()
 
@@ -347,6 +367,57 @@ func TestNotify_JIRAInteraction(t *testing.T) {
 				},
 			},
 		},
+		{
+			name:        "opened ticket, update specified custom field value",
+			inputConfig: testReceiverConfigWithCustomFields(),
+			initJira: func(t *testing.T) *fakeJira {
+				f := newTestFakeJira()
+				_, _, err := f.Create(&jira.Issue{
+					ID:  "1",
+					Key: "1",
+					Fields: &jira.IssueFields{
+						Project: jira.Project{Key: testReceiverConfigWithCustomFields().Project},
+						Labels:  []string{"JIRALERT{819ba5ecba4ea5946a8d17d285cb23f3bb6862e08bb602ab08fd231cd8e1a83a1d095b0208a661787e9035f0541817634df5a994d1b5d4200d6c68a7663c97f5}"},
+						Unknowns: tcontainer.MarshalMap(map[string]interface{}{
+							"customfield_12345": "90",
+						}),
+						Summary:     "[FIRING:1] b d ",
+						Description: "1",
+					},
+				})
+				require.NoError(t, err)
+				return f
+			},
+			inputAlert: &alertmanager.Data{
+				Alerts: alertmanager.Alerts{
+					{Status: alertmanager.AlertFiring,
+						Annotations: alertmanager.KV{
+							"AlertValue": "95",
+						},
+					}, // New value for the field
+				},
+				Status:      alertmanager.AlertFiring,
+				GroupLabels: alertmanager.KV{"a": "b", "c": "d"},
+			},
+			expectedJiraIssues: map[string]*jira.Issue{
+				"1": {
+					ID:  "1",
+					Key: "1",
+					Fields: &jira.IssueFields{
+						Project: jira.Project{Key: testReceiverConfigWithCustomFields().Project},
+						Labels:  []string{"JIRALERT{819ba5ecba4ea5946a8d17d285cb23f3bb6862e08bb602ab08fd231cd8e1a83a1d095b0208a661787e9035f0541817634df5a994d1b5d4200d6c68a7663c97f5}"},
+						Status: &jira.Status{
+							StatusCategory: jira.StatusCategory{Key: "NotDone"},
+						},
+						Unknowns: tcontainer.MarshalMap{
+							"customfield_12345": "95",
+						},
+						Summary:     "[FIRING:1] b d ",
+						Description: "1",
+					},
+				},
+			},
+		},
 		{
 			name:        "closed ticket, reopen and update summary",
 			inputConfig: testReceiverConfig1(),