diff --git a/configure.ac b/configure.ac
index 1add108..46b3b0c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-m4_define([cthulhu_version], [0.3])
+m4_define([cthulhu_version], [0.4])
 
 m4_define(pygobject_required_version, 3.18)
 m4_define(atspi_required_version, 2.48)
@@ -28,6 +28,7 @@ PKG_CHECK_MODULES([PYGOBJECT], [pygobject-3.0 >= pygobject_required_version])
 PKG_CHECK_MODULES([ATSPI2], [atspi-2 >= atspi_required_version])
 PKG_CHECK_MODULES([ATKBRIDGE], [atk-bridge-2.0 >= atkbridge_required_version])
 PKG_CHECK_MODULES([GSTREAMER], [gstreamer-1.0], [gstreamer="yes"], [gstreamer="no"])
+PKG_CHECK_MODULES([LIBPEAS], [libpeas-1.0], [libpeas="yes"], [libpeas="no"])
 
 dnl Needed programs
 AC_PROG_INSTALL
@@ -158,6 +159,10 @@ echo
 echo "NOTE: Sound support requires gstreamer-1.0."
 fi
 
+if test "$have_libpeas" = "no"; then
+  AC_MSG_ERROR([libpeas-1.0 >= 1.20 is required])
+fi
+
 echo
 echo Use speech-dispatcher: $speechd_available
 echo Use brltty: $brlapi_available