diff --git a/INSTALL b/INSTALL
index 9723406a..4322d70e 100644
--- a/INSTALL
+++ b/INSTALL
@@ -16,8 +16,8 @@
 
   * Dependencies
 
-    Building Geary requires at least GTK+ version 3.14, WebKitGTK+ 2.4
-    and Vala 0.26, with a full GObject introspection repository,
+    Building Geary requires at least GTK+ version 3.14, WebKitGTK+
+    2.10 and Vala 0.26, with a full GObject introspection repository,
     intltool, cmake, desktop-file-validate, and xml2po.  Vala's
     vapigen must be installed as well.
 
@@ -44,7 +44,7 @@
       * libxml-2.0
       * notify
       * sqlite3
-      * webkitgtk-3.0
+      * webkit2gtk-4.0
       * gcr-3
       * enchant
       * messaging-menu (optional; enables support for Ubuntu Unity messaging
@@ -63,7 +63,7 @@
         $ sudo yum install vala gobject-introspection-devel intltool cmake \
             desktop-file-utils gnome-doc-utils libcanberra-devel libgee-devel \
             glib2-devel gmime-devel gtk3-devel libnotify-devel sqlite-devel \
-            unique3-devel webkitgtk3-devel libsecret-devel libxml2-devel \
+            unique3-devel webkitgtk4-devel libsecret-devel libxml2-devel \
             vala-tools gcr-devel enchant-devel
 
 
@@ -77,7 +77,7 @@
             cmake desktop-file-utils gnome-doc-utils libcanberra-dev \
             libgee-0.8-dev libglib2.0-dev libgmime-2.6-dev libgtk-3-dev \
             libsecret-1-dev libxml2-dev libnotify-dev libsqlite3-dev \
-            libunique-3.0-dev libwebkitgtk-3.0-dev libmessaging-menu-dev \
+            libunique-3.0-dev libwebkit2gtk-4.0-dev libmessaging-menu-dev \
             libunity-dev libgcr-3-dev libenchant-dev
 
     Ubuntu 14.04 (Trusty LTS) and 12.04 (Precise LTS) do not have all
diff --git a/debian/control b/debian/control
index 74cc2d7f..e68f86a7 100644
--- a/debian/control
+++ b/debian/control
@@ -9,7 +9,7 @@ Build-Depends: debhelper (>= 8),
  libsoup2.4-dev (>= 2.48),
  libnotify-dev (>=0.7.5),
  libcanberra-dev (>= 0.28),
- libwebkitgtk-3.0-dev (>= 2.4),
+ libwebkit2gtk-4.0-dev (>= 2.10),
  libxml2-dev (>= 2.7.8),
  libsecret-1-dev (>= 0.11),
  libgmime-2.6-dev (>= 2.6.14),
@@ -36,7 +36,7 @@ Depends: ${shlibs:Depends}, ${misc:Depends},
  libsoup2.4-1 (>= 2.48),
  libnotify4 (>= 0.7.5),
  libcanberra0 (>= 0.28),
- libwebkitgtk-3.0-0 (>= 2.4),
+ libwebkit2gtk-4.0-37 (>= 2.10),
  libxml2 (>= 2.7.8),
  libsqlite3-0 (>= 3.7.4),
  libgmime-2.6-0 (>= 2.6.14),