diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45c14ff5..f4ac2a8e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ Airbrake Ruby Changelog
 
 ### master
 
+* Started filtering the context payload
+  ([#55](https://github.com/airbrake/airbrake-ruby/pull/55))
 * Fixed bug when similar keys would be filtered out using non-regexp values for
   `Airbrake.blacklist/whitelist_keys`
   ([#54](https://github.com/airbrake/airbrake-ruby/pull/54))
diff --git a/lib/airbrake-ruby/filters/keys_filter.rb b/lib/airbrake-ruby/filters/keys_filter.rb
index ed47646b..d52fb889 100644
--- a/lib/airbrake-ruby/filters/keys_filter.rb
+++ b/lib/airbrake-ruby/filters/keys_filter.rb
@@ -9,6 +9,10 @@ module Filters
     # @see KeysWhitelist
     # @see KeysBlacklist
     module KeysFilter
+      ##
+      # @return [String] The label to replace real values of filtered payload
+      FILTERED = '[Filtered]'.freeze
+
       ##
       # Creates a new KeysBlacklist or KeysWhitelist filter that uses the given
       # +patterns+ for filtering a notice's payload.
@@ -28,6 +32,10 @@ def initialize(*patterns)
       def call(notice)
         FILTERABLE_KEYS.each { |key| filter_hash(notice[key]) }
 
+        if notice[:context][:user] && should_filter?(:user)
+          notice[:context][:user] = FILTERED
+        end
+
         return unless notice[:context][:url]
         url = URI(notice[:context][:url])
         return if url.nil? || url.query.nil?
diff --git a/spec/notifier_spec.rb b/spec/notifier_spec.rb
index f29894ed..eee40675 100644
--- a/spec/notifier_spec.rb
+++ b/spec/notifier_spec.rb
@@ -553,6 +553,17 @@ def to_json(*)
         with(body: expected_body)
       ).to have_been_made.once
     end
+
+    it "filters out user" do
+      @airbrake.blacklist_keys('user')
+
+      notice = @airbrake.build_notice(ex)
+      notice[:context][:user] = { id: 1337, name: 'Bingo Bango' }
+
+      @airbrake.notify_sync(notice)
+
+      expect_a_request_with_body(/"user":"\[Filtered\]"/)
+    end
   end
 
   describe "#whitelist_keys" do