diff --git a/Gemfile b/Gemfile
index 3fba8be65..30c060666 100644
--- a/Gemfile
+++ b/Gemfile
@@ -85,7 +85,8 @@ gem 'omniauth-github-discourse', require: 'omniauth-github'
 gem 'omniauth-oauth2', require: false
 
 # see: https://github.com/zquestz/omniauth-google-oauth2/pull/193#issuecomment-170447701
-gem 'omniauth-google-oauth2', '0.2.6'
+# https://meta.discourse.org/t/google-authentication-bug-on-discourse/37734
+gem 'omniauth-google-oauth2', '0.2.5'
 gem 'oj'
 gem 'pg'
 gem 'pry-rails', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 4a93fb3ff..4625568ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -194,7 +194,7 @@ GEM
     omniauth-github-discourse (1.1.2)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.1)
-    omniauth-google-oauth2 (0.2.6)
+    omniauth-google-oauth2 (0.2.5)
       omniauth (> 1.0)
       omniauth-oauth2 (~> 1.1)
     omniauth-oauth (1.1.0)
@@ -444,7 +444,7 @@ DEPENDENCIES
   omniauth
   omniauth-facebook
   omniauth-github-discourse
-  omniauth-google-oauth2 (= 0.2.6)
+  omniauth-google-oauth2 (= 0.2.5)
   omniauth-oauth2
   omniauth-openid
   omniauth-twitter