diff --git a/Gemfile b/Gemfile
index 7e9925f..cf086c5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 gem "opengl-bindings", require: "opengl"
 gem "cyberarm_engine", git: "https://github.com/cyberarm/cyberarm_engine"
-gem "nokogiri"
+gem "nokogiri", ">= 1.11.0.rc1"
 
 group(:packaging) do
   gem "ocra"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9ded38e..b387f68 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,26 +1,26 @@
 GIT
   remote: https://github.com/cyberarm/cyberarm_engine
-  revision: 9a3caabc7e36f572ef458dc473edd2961dad8f40
+  revision: 8cedb402833b7c81c30108ebc7bcd2e2849b6fa5
   specs:
-    cyberarm_engine (0.12.1)
-      gosu (~> 0.14.0)
+    cyberarm_engine (0.13.0)
+      gosu (~> 0.15.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    gosu (0.14.5)
-    gosu (0.14.5-x64-mingw32)
-    gosu (0.14.5-x86-mingw32)
-    ocra (1.3.10)
+    gosu (0.15.1-x64-mingw32)
+    mini_portile2 (2.4.0)
+    nokogiri (1.11.0.rc1-x64-mingw32)
+      mini_portile2 (~> 2.4.0)
+    ocra (1.3.11)
     opengl-bindings (1.6.9)
 
 PLATFORMS
-  ruby
   x64-mingw32
-  x86-mingw32
 
 DEPENDENCIES
   cyberarm_engine!
+  nokogiri (>= 1.11.0.rc1)
   ocra
   opengl-bindings
 
diff --git a/Rakefile b/Rakefile
index 111ab76..80d1751 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,7 +7,7 @@ Releasy::Project.new do
   version "#{IMICFPS::VERSION}"
 
   executable "i-mic-fps.rb"
-  files ["lib/**/*.*", "assets/**/*.*", "blends/**/*.*", "shaders/**/*.*"]
+  files ["lib/**/*.*", "assets/**/*.*", "blends/**/*.*", "shaders/**/*.*", "static/**/*.*", "maps/**/*.*", "data/**/*.*"]
   exclude_encoding # Applications that don't use advanced encoding (e.g. Japanese characters) can save build size with this.
   verbose
 
diff --git a/lib/tools/asset_viewer/lib/turn_table.rb b/lib/tools/asset_viewer/lib/turn_table.rb
index 4baf009..085df2a 100644
--- a/lib/tools/asset_viewer/lib/turn_table.rb
+++ b/lib/tools/asset_viewer/lib/turn_table.rb
@@ -20,7 +20,7 @@ class IMICFPS
         @map = ProtoMap.new
         Publisher.new
 
-        @entity = Entity.new(manifest: @manifest, auto_manage: false)
+        @entity = Entity.new(manifest: @manifest)
         @entity.bind_model
         @map.add_entity(@entity)
         @map.entities.each { |e| e.backface_culling = false }
diff --git a/shaders/include/light_struct.glsl b/shaders/include/light_struct.glsl
index 736ff21..b5ecb7e 100644
--- a/shaders/include/light_struct.glsl
+++ b/shaders/include/light_struct.glsl
@@ -1,4 +1,4 @@
-const int MAX_LIGHTS = 4;
+const int MAX_LIGHTS = 2;
 
 struct Light {
   float end;