diff --git a/Gemfile b/Gemfile
index 5896f772f..c2145c02c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,6 +26,7 @@ gem "deface"
 gem "image_processing"
 gem "newrelic_rpm"
 
+gem "omniauth-cityos-dcp", git: "https://github.com/TheDesignium/omniauth-cityos-dcp.git", tag: "v1.2.0"
 gem "omniauth-line_login", path: "omniauth-line_login"
 gem "omniauth-rails_csrf_protection"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index d9d71de12..3bc4090a0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,3 +1,12 @@
+GIT
+  remote: https://github.com/TheDesignium/omniauth-cityos-dcp.git
+  revision: c9c27abfa052ab52d5b2edc9f299b971fb95a69f
+  tag: v1.2.0
+  specs:
+    omniauth-cityos-dcp (0.1.0)
+      decidim (>= 0.28.0)
+      omniauth-oauth2
+
 GIT
   remote: https://github.com/codeforjapan/decidim-module-decidim_awesome.git
   revision: b2800256f5e147452438686029b3990c89fb21be
@@ -917,6 +926,7 @@ DEPENDENCIES
   letter_opener_web
   listen (~> 3.1)
   newrelic_rpm
+  omniauth-cityos-dcp!
   omniauth-line_login!
   omniauth-rails_csrf_protection
   puma (>= 6.3.1)