diff --git a/Gemfile b/Gemfile
index 945644650e8..0a851079286 100644
--- a/Gemfile
+++ b/Gemfile
@@ -68,7 +68,7 @@ gem 'rqrcode'
 gem 'ruby-progressbar'
 gem 'ruby-saml'
 gem 'safe_target_blank', '>= 1.0.2'
-gem 'saml_idp', github: '18F/saml_idp', tag: '0.21.1-18f'
+gem 'saml_idp', github: '18F/saml_idp', tag: '0.21.0-18f'
 gem 'scrypt'
 gem 'simple_form', '>= 5.0.2'
 gem 'stringex', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 8a3663f2c16..cd99e9faca4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,10 +35,10 @@ GIT
 
 GIT
   remote: https://github.com/18F/saml_idp.git
-  revision: 85c9a24bd4edab43320d0454e2c0e2fac31ffb90
-  tag: 0.21.1-18f
+  revision: 33275d69f7609e448942d6e3ce5c27779920995f
+  tag: 0.21.0-18f
   specs:
-    saml_idp (0.21.1.pre.18f)
+    saml_idp (0.21.0.pre.18f)
       activesupport
       builder
       faraday