diff --git a/Gemfile.lock b/Gemfile.lock
index fed2316..140c70e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ PATH
       google-api-client (~> 0.31.0)
       google-api-fcm (~> 0.1.7)
       json (>= 1.8, < 2.0)
-      rack (~> 2.0.6)
+      rack (>= 2.0.6, < 2.3.0)
       rake (~> 12.3.2)
       redis (~> 4.1.0)
       redis-namespace (~> 1.6.0)
@@ -42,7 +42,7 @@ GEM
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     clamp (1.0.1)
-    connection_pool (2.2.2)
+    connection_pool (2.2.3)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     daemons (1.3.1)
@@ -138,14 +138,14 @@ GEM
       mustache (= 0.99.8)
       stud
     public_suffix (4.0.3)
-    rack (2.0.9)
+    rack (2.2.3)
     rack-fiber_pool (0.9.3)
     rack-protection (2.0.8.1)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rake (12.3.3)
-    redis (4.1.3)
+    redis (4.1.4)
     redis-namespace (1.6.0)
       redis (>= 3.0.4)
     representable (3.0.4)
@@ -209,7 +209,7 @@ GEM
     uber (0.1.0)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.6)
+    unf_ext (0.0.7.7)
     vegas (0.1.11)
       rack (>= 1.0.0)
     webmock (3.5.1)
diff --git a/rhoconnect.gemspec b/rhoconnect.gemspec
index bebe0e9..8f8e15c 100644
--- a/rhoconnect.gemspec
+++ b/rhoconnect.gemspec
@@ -40,7 +40,7 @@ Gem::Specification.new do |s|
   ]
 
   s.add_dependency('bundler', '~> 1.17.3')
-  s.add_dependency('rack', '~> 2.0.6')
+  s.add_dependency('rack', '>= 2.0.6', '< 2.3.0')
   s.add_dependency('sinatra', '~> 2.0.5')
   s.add_dependency('rake', '~> 12.3.2')
   s.add_dependency('json', '>= 1.8', '< 2.0')