diff --git a/ChangeLog b/ChangeLog
index 7b38189b548e..07a4daa5d7a9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-10  Carlos Garcia Campos  <cgarcia@igalia.com>
+
+        Unreviewed. Update OptionsGTK.cmake and NEWS for 2.18.5 release.
+
+        * Source/cmake/OptionsGTK.cmake: Bump version numbers.
+
 2017-12-19  Carlos Garcia Campos  <cgarcia@igalia.com>
 
         Unreviewed. Update OptionsGTK.cmake and NEWS for 2.18.4 release.
diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 1b9c2c5e75c8..8698c4902308 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-10  Carlos Garcia Campos  <cgarcia@igalia.com>
+
+        Unreviewed. Update OptionsGTK.cmake and NEWS for 2.18.5 release.
+
+        * gtk/NEWS: Add release notes for 2.18.5.
+
 2017-12-18  Carlos Garcia Campos  <cgarcia@igalia.com>
 
         [GTK][WPE] Enable WebProcess memory monitor
diff --git a/Source/WebKit/gtk/NEWS b/Source/WebKit/gtk/NEWS
index b19e424056d1..aff3b91aedd3 100644
--- a/Source/WebKit/gtk/NEWS
+++ b/Source/WebKit/gtk/NEWS
@@ -1,3 +1,14 @@
+==================
+WebKitGTK+  2.18.5
+==================
+
+What's new in WebKitGTK+ 2.18.4?
+
+  - Disable SharedArrayBuffers from Web API.
+  - Reduce the precision of "high" resolution time to 1ms.
+  - Fix API documentation generation with newer gtk-doc.
+  - Security fixes: includes improvements to mitigate the effects of Spectre (CVE-2017-5753 and CVE-2017-5715).
+
 ==================
 WebKitGTK+  2.18.4
 ==================
diff --git a/Source/cmake/OptionsGTK.cmake b/Source/cmake/OptionsGTK.cmake
index eeb38eeb1ba2..fd67a066bed3 100644
--- a/Source/cmake/OptionsGTK.cmake
+++ b/Source/cmake/OptionsGTK.cmake
@@ -1,11 +1,11 @@
 include(GNUInstallDirs)
 include(VersioningUtils)
 
-SET_PROJECT_VERSION(2 18 4)
+SET_PROJECT_VERSION(2 18 5)
 set(WEBKITGTK_API_VERSION 4.0)
 
-CALCULATE_LIBRARY_VERSIONS_FROM_LIBTOOL_TRIPLE(WEBKIT2 61 7 24)
-CALCULATE_LIBRARY_VERSIONS_FROM_LIBTOOL_TRIPLE(JAVASCRIPTCORE 24 13 6)
+CALCULATE_LIBRARY_VERSIONS_FROM_LIBTOOL_TRIPLE(WEBKIT2 61 8 24)
+CALCULATE_LIBRARY_VERSIONS_FROM_LIBTOOL_TRIPLE(JAVASCRIPTCORE 24 14 6)
 
 # These are shared variables, but we special case their definition so that we can use the
 # CMAKE_INSTALL_* variables that are populated by the GNUInstallDirs macro.