diff --git a/Gemfile b/Gemfile
index ac4e0d6..a0eb470 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 gem "opengl-bindings", require: "opengl"
-gem "cyberarm_engine"
+gem "cyberarm_engine", git: "https://github.com/cyberarm/cyberarm_engine"
 
 group(:packaging) do
   gem "ocra"
diff --git a/Gemfile.lock b/Gemfile.lock
index 043f741..ea56105 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,13 @@
+GIT
+  remote: https://github.com/cyberarm/cyberarm_engine
+  revision: e59771e4127f51e3c6b3aa239dd2a5f8d2a4b7fe
+  specs:
+    cyberarm_engine (0.12.1)
+      gosu (~> 0.14.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
-    cyberarm_engine (0.10.2)
-      gosu (~> 0.14.0)
     gosu (0.14.5)
     gosu (0.14.5-x64-mingw32)
     gosu (0.14.5-x86-mingw32)
@@ -15,7 +20,7 @@ PLATFORMS
   x86-mingw32
 
 DEPENDENCIES
-  cyberarm_engine
+  cyberarm_engine!
   ocra
   opengl-bindings