diff --git a/hostapd/config_file.c b/hostapd/config_file.c
index 091437a3b..ac08b7bda 100644
--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -3770,8 +3770,6 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 	} else if (os_strcmp(buf, "dpp_csign") == 0) {
 		if (parse_wpabuf_hex(line, buf, &bss->dpp_csign, pos))
 			return 1;
-	} else if (os_strcmp(buf, "dpp_csign_expiry") == 0) {
-		bss->dpp_csign_expiry = strtol(pos, NULL, 0);
 #endif /* CONFIG_DPP */
 #ifdef CONFIG_OWE
 	} else if (os_strcmp(buf, "owe_transition_bssid") == 0) {
diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index 83f422964..ac459471c 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -642,7 +642,6 @@ struct hostapd_bss_config {
 	struct wpabuf *dpp_netaccesskey;
 	unsigned int dpp_netaccesskey_expiry;
 	struct wpabuf *dpp_csign;
-	unsigned int dpp_csign_expiry;
 #endif /* CONFIG_DPP */
 
 #ifdef CONFIG_OWE
diff --git a/src/ap/dpp_hostapd.c b/src/ap/dpp_hostapd.c
index c73c56cc4..d18d31fd3 100644
--- a/src/ap/dpp_hostapd.c
+++ b/src/ap/dpp_hostapd.c
@@ -732,14 +732,8 @@ static void hostapd_dpp_gas_resp_cb(void *ctx, const u8 *addr, u8 dialog_token,
 			wpa_snprintf_hex(hex, hexlen,
 					 wpabuf_head(auth->c_sign_key),
 					 wpabuf_len(auth->c_sign_key));
-			if (auth->c_sign_key_expiry)
-				wpa_msg(hapd->msg_ctx, MSG_INFO,
-					DPP_EVENT_C_SIGN_KEY "%s %lu", hex,
-					(unsigned long)
-					auth->c_sign_key_expiry);
-			else
-				wpa_msg(hapd->msg_ctx, MSG_INFO,
-					DPP_EVENT_C_SIGN_KEY "%s", hex);
+			wpa_msg(hapd->msg_ctx, MSG_INFO,
+				DPP_EVENT_C_SIGN_KEY "%s", hex);
 			os_free(hex);
 		}
 	}
@@ -951,11 +945,6 @@ static void hostapd_dpp_rx_peer_disc_req(struct hostapd_data *hapd,
 	}
 
 	os_get_time(&now);
-	if (hapd->conf->dpp_csign_expiry &&
-	    hapd->conf->dpp_csign_expiry < now.sec) {
-		wpa_printf(MSG_DEBUG, "DPP: C-sign-key expired");
-		return;
-	}
 
 	if (hapd->conf->dpp_netaccesskey_expiry &&
 	    hapd->conf->dpp_netaccesskey_expiry < now.sec) {
@@ -991,8 +980,6 @@ static void hostapd_dpp_rx_peer_disc_req(struct hostapd_data *hapd,
 
 	if (!expire || hapd->conf->dpp_netaccesskey_expiry < expire)
 		expire = hapd->conf->dpp_netaccesskey_expiry;
-	if (!expire || hapd->conf->dpp_csign_expiry < expire)
-		expire = hapd->conf->dpp_csign_expiry;
 	if (expire)
 		expiration = expire - now.sec;
 	else
@@ -1306,14 +1293,13 @@ static unsigned int hostapd_dpp_next_configurator_id(struct hostapd_data *hapd)
 
 int hostapd_dpp_configurator_add(struct hostapd_data *hapd, const char *cmd)
 {
-	char *expiry = NULL, *curve = NULL;
+	char *curve = NULL;
 	char *key = NULL;
 	u8 *privkey = NULL;
 	size_t privkey_len = 0;
 	int ret = -1;
 	struct dpp_configurator *conf = NULL;
 
-	expiry = get_param(cmd, " expiry=");
 	curve = get_param(cmd, " curve=");
 	key = get_param(cmd, " key=");
 
@@ -1329,22 +1315,12 @@ int hostapd_dpp_configurator_add(struct hostapd_data *hapd, const char *cmd)
 	if (!conf)
 		goto fail;
 
-	if (expiry) {
-		long int val;
-
-		val = strtol(expiry, NULL, 0);
-		if (val <= 0)
-			goto fail;
-		conf->csign_expiry = val;
-	}
-
 	conf->id = hostapd_dpp_next_configurator_id(hapd);
 	dl_list_add(&hapd->dpp_configurator, &conf->list);
 	ret = conf->id;
 	conf = NULL;
 fail:
 	os_free(curve);
-	os_free(expiry);
 	str_clear_free(key);
 	bin_clear_free(privkey, privkey_len);
 	dpp_configurator_free(conf);
diff --git a/src/common/dpp.c b/src/common/dpp.c
index ab6010aa8..85b97fb4f 100644
--- a/src/common/dpp.c
+++ b/src/common/dpp.c
@@ -3156,19 +3156,6 @@ skip_groups:
 		wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK");
 		goto fail;
 	}
-	if (auth->conf->csign_expiry) {
-		struct os_tm tm;
-
-		if (os_gmtime(auth->conf->csign_expiry, &tm) < 0) {
-			wpa_printf(MSG_DEBUG,
-				   "DPP: Failed to generate expiry string");
-			goto fail;
-		}
-		wpabuf_printf(buf,
-			      ",\"expiry\":\"%04u-%02u-%02uT%02u:%02u:%02uZ\"",
-			      tm.year, tm.month, tm.day,
-			      tm.hour, tm.min, tm.sec);
-	}
 
 	wpabuf_put_str(buf, "}}");
 
@@ -4078,18 +4065,6 @@ static int dpp_parse_cred_dpp(struct dpp_authentication *auth,
 	}
 	dpp_debug_print_key("DPP: Received C-sign-key", csign_pub);
 
-	token = json_get_member(cred, "expiry");
-	if (!token || token->type != JSON_STRING) {
-		wpa_printf(MSG_DEBUG,
-			   "DPP: No expiry string found - C-sign-key does not expire");
-	} else {
-		wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
-		if (dpp_key_expired(token->string, &auth->c_sign_key_expiry)) {
-			wpa_printf(MSG_DEBUG, "DPP: C-sign-key has expired");
-			goto fail;
-		}
-	}
-
 	token = json_get_member(cred, "signedConnector");
 	if (!token || token->type != JSON_STRING) {
 		wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found");
diff --git a/src/common/dpp.h b/src/common/dpp.h
index 550157e18..534036aa3 100644
--- a/src/common/dpp.h
+++ b/src/common/dpp.h
@@ -178,7 +178,6 @@ struct dpp_authentication {
 	struct wpabuf *net_access_key;
 	os_time_t net_access_key_expiry;
 	struct wpabuf *c_sign_key;
-	os_time_t c_sign_key_expiry;
 #ifdef CONFIG_TESTING_OPTIONS
 	char *config_obj_override;
 	char *discovery_override;
@@ -194,7 +193,6 @@ struct dpp_configurator {
 	EVP_PKEY *csign;
 	char *kid;
 	const struct dpp_curve_params *curve;
-	os_time_t csign_expiry;
 };
 
 struct dpp_introduction {
diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
index 79f36b945..1ff0799dc 100644
--- a/wpa_supplicant/config.c
+++ b/wpa_supplicant/config.c
@@ -2279,7 +2279,6 @@ static const struct parse_data ssid_fields[] = {
 	{ STR_LEN(dpp_netaccesskey) },
 	{ INT(dpp_netaccesskey_expiry) },
 	{ STR_LEN(dpp_csign) },
-	{ INT(dpp_csign_expiry) },
 #endif /* CONFIG_DPP */
 	{ INT_RANGE(owe_group, 0, 65535) },
 };
diff --git a/wpa_supplicant/config_file.c b/wpa_supplicant/config_file.c
index b2f760ae4..489237cc1 100644
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -871,7 +871,6 @@ static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 	STR(dpp_netaccesskey);
 	INT(dpp_netaccesskey_expiry);
 	STR(dpp_csign);
-	INT(dpp_csign_expiry);
 #endif /* CONFIG_DPP */
 	INT(owe_group);
 #ifdef CONFIG_HT_OVERRIDES
diff --git a/wpa_supplicant/config_ssid.h b/wpa_supplicant/config_ssid.h
index 120218f48..2748c6a88 100644
--- a/wpa_supplicant/config_ssid.h
+++ b/wpa_supplicant/config_ssid.h
@@ -887,13 +887,6 @@ struct wpa_ssid {
 	 */
 	size_t dpp_csign_len;
 
-	/**
-	 * dpp_csign_expiry - C-sign-key expiry in UNIX time stamp
-	 *
-	 * 0 indicates no expiration.
-	 */
-	unsigned int dpp_csign_expiry;
-
 	/**
 	 * owe_group - OWE DH Group
 	 *
diff --git a/wpa_supplicant/dpp_supplicant.c b/wpa_supplicant/dpp_supplicant.c
index 44178f971..2492749fe 100644
--- a/wpa_supplicant/dpp_supplicant.c
+++ b/wpa_supplicant/dpp_supplicant.c
@@ -935,7 +935,6 @@ static struct wpa_ssid * wpas_dpp_add_network(struct wpa_supplicant *wpa_s,
 		os_memcpy(ssid->dpp_csign, wpabuf_head(auth->c_sign_key),
 			  wpabuf_len(auth->c_sign_key));
 		ssid->dpp_csign_len = wpabuf_len(auth->c_sign_key);
-		ssid->dpp_csign_expiry = auth->c_sign_key_expiry;
 	}
 
 	if (auth->net_access_key) {
@@ -1025,14 +1024,8 @@ static void wpas_dpp_handle_config_obj(struct wpa_supplicant *wpa_s,
 			wpa_snprintf_hex(hex, hexlen,
 					 wpabuf_head(auth->c_sign_key),
 					 wpabuf_len(auth->c_sign_key));
-			if (auth->c_sign_key_expiry)
-				wpa_msg(wpa_s, MSG_INFO, DPP_EVENT_C_SIGN_KEY
-					"%s %lu", hex,
-					(long unsigned)
-					auth->c_sign_key_expiry);
-			else
-				wpa_msg(wpa_s, MSG_INFO, DPP_EVENT_C_SIGN_KEY
-					"%s", hex);
+			wpa_msg(wpa_s, MSG_INFO, DPP_EVENT_C_SIGN_KEY "%s",
+				hex);
 			os_free(hex);
 		}
 	}
@@ -1348,8 +1341,6 @@ static void wpas_dpp_rx_peer_disc_resp(struct wpa_supplicant *wpa_s,
 	os_memcpy(entry->pmk, intro.pmk, intro.pmk_len);
 	entry->pmk_len = intro.pmk_len;
 	entry->akmp = WPA_KEY_MGMT_DPP;
-	if (!expiry || expiry > ssid->dpp_csign_expiry)
-		expiry = ssid->dpp_csign_expiry;
 	if (expiry) {
 		os_get_time(&now);
 		seconds = expiry - now.sec;
@@ -1712,14 +1703,13 @@ static unsigned int wpas_dpp_next_configurator_id(struct wpa_supplicant *wpa_s)
 
 int wpas_dpp_configurator_add(struct wpa_supplicant *wpa_s, const char *cmd)
 {
-	char *expiry = NULL, *curve = NULL;
+	char *curve = NULL;
 	char *key = NULL;
 	u8 *privkey = NULL;
 	size_t privkey_len = 0;
 	int ret = -1;
 	struct dpp_configurator *conf = NULL;
 
-	expiry = get_param(cmd, " expiry=");
 	curve = get_param(cmd, " curve=");
 	key = get_param(cmd, " key=");
 
@@ -1735,22 +1725,12 @@ int wpas_dpp_configurator_add(struct wpa_supplicant *wpa_s, const char *cmd)
 	if (!conf)
 		goto fail;
 
-	if (expiry) {
-		long int val;
-
-		val = strtol(expiry, NULL, 0);
-		if (val <= 0)
-			goto fail;
-		conf->csign_expiry = val;
-	}
-
 	conf->id = wpas_dpp_next_configurator_id(wpa_s);
 	dl_list_add(&wpa_s->dpp_configurator, &conf->list);
 	ret = conf->id;
 	conf = NULL;
 fail:
 	os_free(curve);
-	os_free(expiry);
 	str_clear_free(key);
 	bin_clear_free(privkey, privkey_len);
 	dpp_configurator_free(conf);
@@ -1860,12 +1840,6 @@ int wpas_dpp_check_connect(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,
 
 	os_get_time(&now);
 
-	if (ssid->dpp_csign_expiry && ssid->dpp_csign_expiry < now.sec) {
-		wpa_msg(wpa_s, MSG_INFO, DPP_EVENT_MISSING_CONNECTOR
-			"C-sign-key expired");
-		return -1;
-	}
-
 	if (ssid->dpp_netaccesskey_expiry &&
 	    ssid->dpp_netaccesskey_expiry < now.sec) {
 		wpa_msg(wpa_s, MSG_INFO, DPP_EVENT_MISSING_CONNECTOR