diff --git a/cmd/syncthing/gui.go b/cmd/syncthing/gui.go
index 4e333c47..9061883e 100644
--- a/cmd/syncthing/gui.go
+++ b/cmd/syncthing/gui.go
@@ -773,7 +773,7 @@ func (s *apiSvc) getSystemUpgrade(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, upgrade.ErrUpgradeUnsupported.Error(), 500)
 		return
 	}
-	rel, err := upgrade.LatestRelease(Version)
+	rel, err := upgrade.LatestRelease(cfg.Options().ReleasesURL, Version)
 	if err != nil {
 		http.Error(w, err.Error(), 500)
 		return
@@ -816,7 +816,7 @@ func (s *apiSvc) getLang(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *apiSvc) postSystemUpgrade(w http.ResponseWriter, r *http.Request) {
-	rel, err := upgrade.LatestRelease(Version)
+	rel, err := upgrade.LatestRelease(cfg.Options().ReleasesURL, Version)
 	if err != nil {
 		l.Warnln("getting latest release:", err)
 		http.Error(w, err.Error(), 500)
diff --git a/cmd/syncthing/main.go b/cmd/syncthing/main.go
index 446dec53..061cf30b 100644
--- a/cmd/syncthing/main.go
+++ b/cmd/syncthing/main.go
@@ -347,7 +347,7 @@ func main() {
 	}
 
 	if doUpgrade || doUpgradeCheck {
-		rel, err := upgrade.LatestRelease(Version)
+		rel, err := upgrade.LatestRelease(cfg.Options().ReleasesURL, Version)
 		if err != nil {
 			l.Fatalln("Upgrade:", err) // exits 1
 		}
@@ -1060,7 +1060,7 @@ func autoUpgrade() {
 		case <-timer.C:
 		}
 
-		rel, err := upgrade.LatestRelease(Version)
+		rel, err := upgrade.LatestRelease(cfg.Options().ReleasesURL, Version)
 		if err == upgrade.ErrUpgradeUnsupported {
 			events.Default.Unsubscribe(sub)
 			return
diff --git a/lib/config/config.go b/lib/config/config.go
index 98782081..3e4e1808 100644
--- a/lib/config/config.go
+++ b/lib/config/config.go
@@ -248,6 +248,7 @@ type OptionsConfiguration struct {
 	PingTimeoutS            int      `xml:"pingTimeoutS" json:"pingTimeoutS" default:"30"`
 	PingIdleTimeS           int      `xml:"pingIdleTimeS" json:"pingIdleTimeS" default:"60"`
 	MinHomeDiskFreePct      float64  `xml:"minHomeDiskFreePct" json:"minHomeDiskFreePct" default:"1"`
+	ReleasesURL             string   `xml:"releasesURL" json:"releasesURL" default:"https://api.github.com/repos/syncthing/syncthing/releases?per_page=30"`
 }
 
 func (orig OptionsConfiguration) Copy() OptionsConfiguration {
diff --git a/lib/config/config_test.go b/lib/config/config_test.go
index 6924de15..2bffd6f6 100644
--- a/lib/config/config_test.go
+++ b/lib/config/config_test.go
@@ -63,6 +63,7 @@ func TestDefaultValues(t *testing.T) {
 		URURL:                   "https://data.syncthing.net/newdata",
 		URInitialDelayS:         1800,
 		URPostInsecurely:        false,
+		ReleasesURL:             "https://api.github.com/repos/syncthing/syncthing/releases?per_page=30",
 	}
 
 	cfg := New(device1)
@@ -181,6 +182,7 @@ func TestOverriddenValues(t *testing.T) {
 		URURL:                   "https://localhost/newdata",
 		URInitialDelayS:         800,
 		URPostInsecurely:        true,
+		ReleasesURL:             "https://localhost/releases",
 	}
 
 	cfg, err := Load("testdata/overridenvalues.xml", device1)
diff --git a/lib/config/testdata/overridenvalues.xml b/lib/config/testdata/overridenvalues.xml
index 655cedd8..6677f48c 100755
--- a/lib/config/testdata/overridenvalues.xml
+++ b/lib/config/testdata/overridenvalues.xml
@@ -35,5 +35,6 @@
         <urURL>https://localhost/newdata</urURL>
         <urInitialDelayS>800</urInitialDelayS>
         <urPostInsecurely>true</urPostInsecurely>
+        <releasesURL>https://localhost/releases</releasesURL>
     </options>
 </configuration>
diff --git a/lib/upgrade/upgrade_supported.go b/lib/upgrade/upgrade_supported.go
index 974a1513..68b7cfd0 100644
--- a/lib/upgrade/upgrade_supported.go
+++ b/lib/upgrade/upgrade_supported.go
@@ -46,8 +46,8 @@ var insecureHTTP = &http.Client{
 
 // LatestGithubReleases returns the latest releases, including prereleases or
 // not depending on the argument
-func LatestGithubReleases(version string) ([]Release, error) {
-	resp, err := insecureHTTP.Get("https://api.github.com/repos/syncthing/syncthing/releases?per_page=30")
+func LatestGithubReleases(releasesURL, version string) ([]Release, error) {
+	resp, err := insecureHTTP.Get(releasesURL)
 	if err != nil {
 		return nil, err
 	}
@@ -74,8 +74,8 @@ func (s SortByRelease) Less(i, j int) bool {
 	return CompareVersions(s[i].Tag, s[j].Tag) > 0
 }
 
-func LatestRelease(version string) (Release, error) {
-	rels, _ := LatestGithubReleases(version)
+func LatestRelease(releasesURL, version string) (Release, error) {
+	rels, _ := LatestGithubReleases(releasesURL, version)
 	return SelectLatestRelease(version, rels)
 }