diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d99f809..51ac99b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,9 +25,13 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Fixed
 
+- Incorrect `Content-Type` header value in `POST /control/version.json` and `GET
+  /control/dhcp/interfaces` HTTP APIs ([#5716]).
 - Provided bootstrap servers are now used to resolve the hostnames of plain
   UDP/TCP upstream servers.
 
+[#5716]: https://github.com/AdguardTeam/AdGuardHome/issues/5716
+
 <!--
 NOTE: Add new changes ABOVE THIS COMMENT.
 -->
diff --git a/internal/dhcpd/http_unix.go b/internal/dhcpd/http_unix.go
index 6430afdc..23e7fe81 100644
--- a/internal/dhcpd/http_unix.go
+++ b/internal/dhcpd/http_unix.go
@@ -350,8 +350,10 @@ type netInterfaceJSON struct {
 	Addrs6       []netip.Addr `json:"ipv6_addresses"`
 }
 
+// handleDHCPInterfaces is the handler for the GET /control/dhcp/interfaces HTTP
+// API.
 func (s *server) handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
-	response := map[string]netInterfaceJSON{}
+	resp := map[string]netInterfaceJSON{}
 
 	ifaces, err := net.Interfaces()
 	if err != nil {
@@ -424,20 +426,11 @@ func (s *server) handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
 		}
 		if len(jsonIface.Addrs4)+len(jsonIface.Addrs6) != 0 {
 			jsonIface.GatewayIP = aghnet.GatewayIP(iface.Name)
-			response[iface.Name] = jsonIface
+			resp[iface.Name] = jsonIface
 		}
 	}
 
-	err = json.NewEncoder(w).Encode(response)
-	if err != nil {
-		aghhttp.Error(
-			r,
-			w,
-			http.StatusInternalServerError,
-			"Failed to marshal json with available interfaces: %s",
-			err,
-		)
-	}
+	_ = aghhttp.WriteJSONResponse(w, r, resp)
 }
 
 // dhcpSearchOtherResult contains information about other DHCP server for
diff --git a/internal/home/control.go b/internal/home/control.go
index 9c48d5bc..ae83507c 100644
--- a/internal/home/control.go
+++ b/internal/home/control.go
@@ -180,7 +180,7 @@ func registerControlHandlers() {
 	httpRegister(http.MethodGet, "/control/status", handleStatus)
 	httpRegister(http.MethodPost, "/control/i18n/change_language", handleI18nChangeLanguage)
 	httpRegister(http.MethodGet, "/control/i18n/current_language", handleI18nCurrentLanguage)
-	Context.mux.HandleFunc("/control/version.json", postInstall(optionalAuth(handleGetVersionJSON)))
+	Context.mux.HandleFunc("/control/version.json", postInstall(optionalAuth(handleVersionJSON)))
 	httpRegister(http.MethodPost, "/control/update", handleUpdate)
 	httpRegister(http.MethodGet, "/control/profile", handleGetProfile)
 	httpRegister(http.MethodPut, "/control/profile/update", handlePutProfile)
diff --git a/internal/home/controlupdate.go b/internal/home/controlupdate.go
index 1cea1d14..f7e56208 100644
--- a/internal/home/controlupdate.go
+++ b/internal/home/controlupdate.go
@@ -26,15 +26,14 @@ type temporaryError interface {
 	Temporary() (ok bool)
 }
 
-// Get the latest available version from the Internet
-func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
+// handleVersionJSON is the handler for the POST /control/version.json HTTP API.
+//
+// TODO(a.garipov): Find out if this API used with a GET method by anyone.
+func handleVersionJSON(w http.ResponseWriter, r *http.Request) {
 	resp := &versionResponse{}
 	if Context.disableUpdate {
 		resp.Disabled = true
-		err := json.NewEncoder(w).Encode(resp)
-		if err != nil {
-			aghhttp.Error(r, w, http.StatusInternalServerError, "writing body: %s", err)
-		}
+		_ = aghhttp.WriteJSONResponse(w, r, resp)
 
 		return
 	}
diff --git a/openapi/CHANGELOG.md b/openapi/CHANGELOG.md
index 922788bb..d499cae9 100644
--- a/openapi/CHANGELOG.md
+++ b/openapi/CHANGELOG.md
@@ -4,6 +4,16 @@
 
 ## v0.108.0: API changes
 
+## v0.107.30: API changes
+
+### `POST /control/version.json` and `GET /control/dhcp/interfaces` content type
+
+* The value of the `Content-Type` header in the `POST /control/version.json` and
+  `GET /control/dhcp/interfaces` HTTP APIs is now correctly set to
+  `application/json` as opposed to `text/plain`.
+
+
+
 ## v0.107.29: API changes
 
 ### `GET /control/clients` And `GET /control/clients/find`
@@ -16,6 +26,8 @@
   set AdGuard Home will use default value (false).  It can be changed in the
   future versions.
 
+
+
 ## v0.107.27: API changes
 
 ### The new optional fields `"edns_cs_use_custom"` and `"edns_cs_custom_ip"` in `DNSConfig`