diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e8ad51..ce88a51 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@
 
 set(POPPLER_MAJOR_VERSION "0")
 set(POPPLER_MINOR_VERSION "21")
-set(POPPLER_MICRO_VERSION "3")
+set(POPPLER_MICRO_VERSION "4")
 set(POPPLER_VERSION "${POPPLER_MAJOR_VERSION}.${POPPLER_MINOR_VERSION}.${POPPLER_MICRO_VERSION}")
 
 # command line switches
diff --git a/configure.ac b/configure.ac
index 504f450..399ece7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 m4_define([poppler_version_major],[0])
 m4_define([poppler_version_minor],[21])
-m4_define([poppler_version_micro],[3])
+m4_define([poppler_version_micro],[4])
 m4_define([poppler_version],[poppler_version_major.poppler_version_minor.poppler_version_micro])
 
 AC_PREREQ(2.59)
diff --git a/cpp/Doxyfile b/cpp/Doxyfile
index 7e0099f..580c5ae 100644
--- a/cpp/Doxyfile
+++ b/cpp/Doxyfile
@@ -31,7 +31,7 @@
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 0.21.3
+PROJECT_NUMBER         = 0.21.4
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.
diff --git a/qt4/src/Doxyfile b/qt4/src/Doxyfile
index 9e11bac..9547cd5 100644
--- a/qt4/src/Doxyfile
+++ b/qt4/src/Doxyfile
@@ -31,7 +31,7 @@
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 0.21.3
+PROJECT_NUMBER         = 0.21.4
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.