diff --git a/Gemfile.lock b/Gemfile.lock
index eb034e61e..d66b604a8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,44 +34,43 @@ PATH
   remote: .
   specs:
     devise_token_auth (0.1.42)
-      devise (> 3.5.2, <= 4.3)
+      devise (> 3.5.2, < 4.4)
       rails (< 6)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.2.5.1)
-      actionpack (= 4.2.5.1)
-      actionview (= 4.2.5.1)
-      activejob (= 4.2.5.1)
+    actionmailer (4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.5.1)
-      actionview (= 4.2.5.1)
-      activesupport (= 4.2.5.1)
+    actionpack (4.2.8)
+      actionview (= 4.2.8)
+      activesupport (= 4.2.8)
       rack (~> 1.6)
       rack-test (~> 0.6.2)
       rails-dom-testing (~> 1.0, >= 1.0.5)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (4.2.5.1)
-      activesupport (= 4.2.5.1)
+    actionview (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
       erubis (~> 2.7.0)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    activejob (4.2.5.1)
-      activesupport (= 4.2.5.1)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (4.2.8)
+      activesupport (= 4.2.8)
       globalid (>= 0.3.0)
-    activemodel (4.2.5.1)
-      activesupport (= 4.2.5.1)
+    activemodel (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
-    activerecord (4.2.5.1)
-      activemodel (= 4.2.5.1)
-      activesupport (= 4.2.5.1)
+    activerecord (4.2.8)
+      activemodel (= 4.2.8)
+      activesupport (= 4.2.8)
       arel (~> 6.0)
-    activesupport (4.2.5.1)
+    activesupport (4.2.8)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
@@ -130,7 +129,7 @@ GEM
       minitest (>= 3.0)
     hashie (3.5.5)
     i18n (0.8.1)
-    json (1.8.6)
+    json (2.1.0)
     jwt (1.5.6)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -198,16 +197,16 @@ GEM
     rack-cors (0.4.1)
     rack-test (0.6.3)
       rack (>= 1.0)
-    rails (4.2.5.1)
-      actionmailer (= 4.2.5.1)
-      actionpack (= 4.2.5.1)
-      actionview (= 4.2.5.1)
-      activejob (= 4.2.5.1)
-      activemodel (= 4.2.5.1)
-      activerecord (= 4.2.5.1)
-      activesupport (= 4.2.5.1)
+    rails (4.2.8)
+      actionmailer (= 4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
+      activemodel (= 4.2.8)
+      activerecord (= 4.2.8)
+      activesupport (= 4.2.8)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.5.1)
+      railties (= 4.2.8)
       sprockets-rails
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
@@ -217,9 +216,9 @@ GEM
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
-    railties (4.2.5.1)
-      actionpack (= 4.2.5.1)
-      activesupport (= 4.2.5.1)
+    railties (4.2.8)
+      actionpack (= 4.2.8)
+      activesupport (= 4.2.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (2.2.2)
diff --git a/devise_token_auth.gemspec b/devise_token_auth.gemspec
index 8fe33142b..c49c1296b 100644
--- a/devise_token_auth.gemspec
+++ b/devise_token_auth.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.test_files.reject! { |file| file.match(/[.log|.sqlite3]$/) }
 
   s.add_dependency "rails", "< 6"
-  s.add_dependency "devise", "> 3.5.2", "<= 4.3"
+  s.add_dependency "devise", "> 3.5.2", "< 4.4"
 
   s.add_development_dependency "sqlite3", "~> 1.3"
   s.add_development_dependency 'pg'