diff --git a/Arch/PKGBUILD b/Arch/PKGBUILD
index ab22abb..057e333 100644
--- a/Arch/PKGBUILD
+++ b/Arch/PKGBUILD
@@ -8,7 +8,7 @@ pkgdesc="Bus interface to change screen brightness and capture frames from webca
 arch=('i686' 'x86_64')
 url="https://github.com/FedeDP/${_gitname}"
 license=('GPL')
-depends=('systemd>=221' 'linux-api-headers' 'libx11' 'libxrandr' 'libxext' 'polkit' 'libxss' 'ddcutil' 'libmodule>=3.1.0')
+depends=('systemd>=221' 'linux-api-headers' 'libx11' 'libxrandr' 'libxext' 'polkit' 'libxss' 'ddcutil' 'libmodule>=4.0.0')
 makedepends=('git' 'cmake')
 optdepends=('clight-git: user service to automagically change screen backlight matching ambient brightness.')
 provides=('clightd')
diff --git a/CMakeLists.txt b/CMakeLists.txt
index dbd58c8..adb0451 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-project(clightd VERSION 3.1 LANGUAGES C)
+project(clightd VERSION 3.2 LANGUAGES C)
 
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 
@@ -23,7 +23,7 @@ target_compile_definitions(${PROJECT_NAME} PRIVATE
 set_property(TARGET ${PROJECT_NAME} PROPERTY C_STANDARD 99)
 
 # Required dependencies
-pkg_check_modules(REQ_LIBS REQUIRED libudev libmodule>=3.1.0 polkit-gobject-1)
+pkg_check_modules(REQ_LIBS REQUIRED libudev libmodule>=4.0.0 polkit-gobject-1)
 pkg_search_module(LOGIN_LIBS REQUIRED libelogind libsystemd>=221)
 target_link_libraries(${PROJECT_NAME}
                       m
diff --git a/TODO.md b/TODO.md
index 5cadd71..fce9c44 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,5 @@
 ## 3.2
-- [x] Port to libmodule 4.0.0 (do not require it though)
+- [x] Port to libmodule 4.0.0
 
 ## 3.3
 - [ ] add support for GetSensorData android app
diff --git a/src/modules/backlight.c b/src/modules/backlight.c
index 0c5f198..a2c5b13 100644
--- a/src/modules/backlight.c
+++ b/src/modules/backlight.c
@@ -80,7 +80,7 @@ typedef struct {
     double verse;
 } smooth_client;
 
-static map_ret_code destroy_client(void *userdata, void *client);
+static int dtor_client(void *client);
 static int method_setallbrightness(sd_bus_message *m, void *userdata, sd_bus_error *ret_error);
 static int method_getallbrightness(sd_bus_message *m, void *userdata, sd_bus_error *ret_error);
 static int method_raiseallbrightness(sd_bus_message *m, void *userdata, sd_bus_error *ret_error);
@@ -132,6 +132,7 @@ static bool evaluate(void) {
 
 static void init(void) {
     running_clients = map_new();
+    map_set_dtor(running_clients, dtor_client);
     int r = sd_bus_add_object_vtable(bus,
                                  NULL,
                                  object_path,
@@ -165,22 +166,17 @@ static void receive(const msg_t *msg, const void *userdata) {
             timerfd_settime(sc->smooth_fd, 0, &timerValue, NULL);
         } else {
             m_log("Reached target backlight: %s%.2lf.\n", sc->verse > 0 ? "+" : (sc->verse < 0 ? "-" : ""), sc->target_pct);
-            destroy_client(NULL, sc);
+            map_remove(running_clients, sc->d.sn);
         }
     }
 }
 
 static void destroy(void) {
-    map_iterate(running_clients, destroy_client, NULL);
     map_free(running_clients);
 }
 
-static map_ret_code destroy_client(void *userdata, void *client) {
+static int dtor_client(void *client) {
     smooth_client *sc = (smooth_client *)client;
-    
-    /* Deregister this sc from running map */
-    map_remove(running_clients, sc->d.sn);
-    
     /* Free all resources */
     m_deregister_fd(sc->smooth_fd); // this will automatically close it!
     free(sc->d.sn);
@@ -228,11 +224,7 @@ static int add_backlight_sn(double target_pct, int is_smooth, double smooth_step
         reset_backlight_struct(sc, target_pct, is_smooth, smooth_step, smooth_wait, verse);
         sc->d.sn = strdup(sn);
         sc->d.reached_target = false;
-#if MODULE_VERSION_MAJ == 3
-        map_put(running_clients, sc->d.sn, sc, false);
-#else
-        map_put(running_clients, sc->d.sn, sc, false, false);
-#endif
+        map_put(running_clients, sc->d.sn, sc, false, true);
     }
     
     if (dev) {
@@ -274,8 +266,9 @@ static int method_setallbrightness(sd_bus_message *m, void *userdata, sd_bus_err
             verse = *((int *)userdata);
         }
 
-        /* stop previously running clients and remove them from map */
-        map_iterate(running_clients, destroy_client, NULL);
+        /* Clear map */
+        map_clear(running_clients);
+        map_set_dtor(running_clients, dtor_client);
         add_backlight_sn(target_pct, is_smooth, smooth_step, smooth_wait, verse, backlight_interface, true);
         DDCUTIL_LOOP({
             add_backlight_sn(target_pct, is_smooth, smooth_step, smooth_wait, verse, dinfo->sn, false);
diff --git a/src/modules/idle.c b/src/modules/idle.c
index ef5a61c..0f915c7 100644
--- a/src/modules/idle.c
+++ b/src/modules/idle.c
@@ -24,7 +24,7 @@ typedef struct {
     sd_bus_slot *slot;          // vtable's slot
 } idle_client_t;
 
-static map_ret_code destroy_clients(void *userdata, void *client);
+static map_ret_code dtor_client(void *client);
 static map_ret_code leave_idle(void *userdata, void *client);
 static time_t get_idle_time(const idle_client_t *c);
 static map_ret_code find_free_client(void *out, void *client);
@@ -79,6 +79,7 @@ static bool evaluate(void) {
 
 static void init(void) {
     clients = map_new();
+    map_set_dtor(clients, dtor_client);
     int r = sd_bus_add_object_vtable(bus,
                                      NULL,
                                      object_path,
@@ -127,7 +128,6 @@ static void receive(const msg_t *msg, const void *userdata) {
 }
 
 static void destroy(void) {
-    map_iterate(clients, destroy_clients, NULL);
     map_free(clients);
 }
 
@@ -143,7 +143,7 @@ static map_ret_code leave_idle(void *userdata, void *client) {
     return MAP_OK;
 }
 
-static map_ret_code destroy_clients(void *userdata, void *client) {
+static map_ret_code dtor_client(void *client) {
     idle_client_t *c = (idle_client_t *)client;
     if (c->in_use) {
         destroy_client(c);
@@ -224,11 +224,7 @@ static int method_get_client(sd_bus_message *m, void *userdata, sd_bus_error *re
         m_register_fd(c->fd, true, c);
         c->sender = strdup(sd_bus_message_get_sender(m));
         snprintf(c->path, sizeof(c->path) - 1, "%s/Client%u", object_path, c->id);
-#if MODULE_VERSION_MAJ == 3
-        map_put(clients, c->path, c, true); // store client in hashmap
-#else
-        map_put(clients, c->path, c, true, false);
-#endif
+        map_put(clients, c->path, c, true, true);
         sd_bus_add_object_vtable(bus,
                                 &c->slot,
                                 c->path,