diff --git a/Makefile.am b/Makefile.am
index e3e58f7639..7688695eec 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -164,14 +164,7 @@ DISTCLEANFILES += $(polkit_policy_DATA)
 noinst_LTLIBRARIES += \
 	introspection/libnmdbus.la
 
-# gdbus-codegen 2.38 will emit code that requires glib 2.38, which
-# will then cause availability warnings if we define
-# GLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32.
-#
-# This is fixed in GLib 2.40 (it emits code that takes
-# GLIB_VERSION_MAX_ALLOWED into account), so this workaround can go
-# away when we depend on that.
-introspection_libnmdbus_la_CPPFLAGS = $(filter-out -DGLIB_VERSION_MAX_ALLOWED%,$(GLIB_CFLAGS))
+introspection_libnmdbus_la_CPPFLAGS = $(GLIB_CFLAGS)
 
 introspection_sources = \
 	introspection/org.freedesktop.NetworkManager.AccessPoint.c \
diff --git a/configure.ac b/configure.ac
index 01984dec76..17e83e9ee8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -243,10 +243,6 @@ PKG_CHECK_MODULES(GLIB, [gio-unix-2.0 >= 2.37.6 gmodule-2.0],
                   [PKG_CHECK_MODULES(GLIB, gio-unix-2.0 >= 2.40 gmodule-2.0)
                    AC_SUBST(LOG_DRIVER, '$(top_srcdir)/build-aux/test-driver')])
 
-dnl GLIB_VERSION_MIN_REQUIRED should match the version above.
-dnl GLIB_VERSION_MAX_ALLOWED should be set to the same version;
-dnl nm-glib.h will cause it to be overridden for the functions
-dnl we have compat versions of.
 GLIB_CFLAGS="$GLIB_CFLAGS -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_40"
 
 AC_SUBST(GLIB_CFLAGS)
diff --git a/contrib/fedora/rpm/NetworkManager.spec b/contrib/fedora/rpm/NetworkManager.spec
index baca13ea90..8f94808026 100644
--- a/contrib/fedora/rpm/NetworkManager.spec
+++ b/contrib/fedora/rpm/NetworkManager.spec
@@ -126,7 +126,7 @@ BuildRequires: dbus-glib-devel >= %{dbus_glib_version}
 %if 0%{?fedora}
 BuildRequires: wireless-tools-devel >= %{wireless_tools_version}
 %endif
-BuildRequires: glib2-devel >= 2.32.0
+BuildRequires: glib2-devel >= 2.40.0
 BuildRequires: gobject-introspection-devel >= 0.10.3
 BuildRequires: gettext-devel
 BuildRequires: pkgconfig
diff --git a/introspection/meson.build b/introspection/meson.build
index b3fdbecd1d..b135a867da 100644
--- a/introspection/meson.build
+++ b/introspection/meson.build
@@ -74,17 +74,6 @@ install_data(
   install_dir: dbus_ifaces_dir
 )
 
-'''
-# gdbus-codegen 2.38 will emit code that requires glib 2.38, which
-# will then cause availability warnings if we define
-# GLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32.
-#
-# This is fixed in GLib 2.40 (it emits code that takes
-# GLIB_VERSION_MAX_ALLOWED into account), so this workaround can go
-# away when we depend on that.
-introspection_libnmdbus_la_CPPFLAGS = $(filter-out -DGLIB_VERSION_MAX_ALLOWED%,$(GLIB_CFLAGS))
-'''
-
 libnmdbus = static_library(
   'nmdbus',
   sources: sources,
diff --git a/meson.build b/meson.build
index 4b09a84cc1..7b902486a2 100644
--- a/meson.build
+++ b/meson.build
@@ -209,23 +209,18 @@ config_h.set10('HAVE_LIBSYSTEMD', libsystemd_dep.found())
 systemd_dep = dependency('systemd', required: false)
 have_systemd_200 = systemd_dep.found() and systemd_dep.version().version_compare('>= 200')
 
-gio_unix_dep = dependency('gio-unix-2.0', version: '>= 2.32')
+gio_unix_dep = dependency('gio-unix-2.0', version: '>= 2.40')
 
 log_driver = join_paths(meson.source_root(), 'build-aux', (gio_unix_dep.version().version_compare('>= 2.37.6') ? 'tap-driver.sh' : 'test-driver'))
 
-# FIXME: same version? which version?
-# GLIB_VERSION_MIN_REQUIRED should match the version above.
-# GLIB_VERSION_MAX_ALLOWED should be set to the same version;
-# nm-glib.h will cause it to be overridden for the functions
-# we have compat versions of.
 glib_dep = declare_dependency(
   dependencies: [
     gio_unix_dep,
     dependency('gmodule-2.0')
   ],
   compile_args: [
-    '-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32',
-    '-DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32'
+    '-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40',
+    '-DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_40'
   ]
 )