diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54294e1..5074a1a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@
 endif()
 
 set(POPPLER_MAJOR_VERSION "0")
-set(POPPLER_MINOR_VERSION "50")
+set(POPPLER_MINOR_VERSION "51")
 set(POPPLER_MICRO_VERSION "0")
 set(POPPLER_VERSION "${POPPLER_MAJOR_VERSION}.${POPPLER_MINOR_VERSION}.${POPPLER_MICRO_VERSION}")
 
diff --git a/NEWS b/NEWS
index bc92685..9139ff6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,17 @@
+Release 0.51.0
+        core:
+         * Check for error from NSS in SignatureHandler construct. Bug #99363
+         * Add Form[Field|Widget]::setPartialName
+         * Fix memory leak in PDFDoc::markAnnotations
+
+        qt5:
+         * Implement digital signature support. Bug #94378
+         * Add Poppler::FormField::setName
+         * Fix segfault/assert if LinkDestination is constructed with invalid input string. Bug #99357
+
+        utils:
+         * pdfunite: add fields to AcroForm dict. Bug #99141
+
 Release 0.50.0
         core:
          * PSOutputDev: Fix PS conversion for some files. Bug #63963
@@ -22,7 +36,6 @@
         glib:
          * Use g_slice_new0 for PopplerActionLayer. Bug #98786
 
-
 Release 0.49.0
         core:
          * Merge type3 glyph handling from xpdf 3.04. Bug #96667
diff --git a/configure.ac b/configure.ac
index 94dfa06..90c8b51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 m4_define([poppler_version_major],[0])
-m4_define([poppler_version_minor],[50])
+m4_define([poppler_version_minor],[51])
 m4_define([poppler_version_micro],[0])
 m4_define([poppler_version],[poppler_version_major.poppler_version_minor.poppler_version_micro])
 
diff --git a/cpp/Doxyfile b/cpp/Doxyfile
index 96b5f2f..0b7cbdf 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         = 0.50.0
+PROJECT_NUMBER         = 0.51.0
 
 # 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 3b0416c..937a425 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         = 0.50.0
+PROJECT_NUMBER         = 0.51.0
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.
diff --git a/qt5/src/CMakeLists.txt b/qt5/src/CMakeLists.txt
index 1dee84a..e9f2398 100644
--- a/qt5/src/CMakeLists.txt
+++ b/qt5/src/CMakeLists.txt
@@ -30,7 +30,7 @@
   ArthurOutputDev.cc
 )
 add_library(poppler-qt5 SHARED ${poppler_qt5_SRCS})
-set_target_properties(poppler-qt5 PROPERTIES VERSION 1.8.0 SOVERSION 1)
+set_target_properties(poppler-qt5 PROPERTIES VERSION 1.9.0 SOVERSION 1)
 target_link_libraries(poppler-qt5 poppler ${Qt5Core_LIBRARIES} ${Qt5Gui_LIBRARIES} ${Qt5Xml_LIBRARIES})
 if(MSVC)
 target_link_libraries(poppler-qt5 poppler ${poppler_LIBS})
diff --git a/qt5/src/Doxyfile b/qt5/src/Doxyfile
index 201205b..a908b02 100644
--- a/qt5/src/Doxyfile
+++ b/qt5/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         = 0.50.0
+PROJECT_NUMBER         = 0.51.0
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.
diff --git a/qt5/src/Makefile.am b/qt5/src/Makefile.am
index 430be03..f3700ae 100644
--- a/qt5/src/Makefile.am
+++ b/qt5/src/Makefile.am
@@ -61,7 +61,7 @@
 	$(POPPLER_QT5_LIBS)
 
 libpoppler_qt5_la_LDFLAGS =			\
-	-version-info 9:0:8			\
+	-version-info 10:0:9			\
 	@create_shared_lib@			\
 	@auto_import_flags@