diff --git a/Gemfile.lock b/Gemfile.lock
index 51f5be8..7552aa8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,33 +10,39 @@ GEM
     bundler-audit (0.9.1)
       bundler (>= 1.2.0, < 3)
       thor (~> 1.0)
-    diff-lcs (1.5.0)
+    diff-lcs (1.5.1)
     docile (1.4.0)
-    ffi (1.15.5)
-    io-console (0.6.0)
-    irb (1.6.3)
-      reline (>= 0.3.0)
-    rake (13.0.6)
+    ffi (1.16.3)
+    io-console (0.7.2)
+    irb (1.11.2)
+      rdoc
+      reline (>= 0.4.2)
+    psych (5.1.2)
+      stringio
+    rake (13.1.0)
     rbnacl (7.1.1)
       ffi
-    reline (0.3.2)
+    rdoc (6.6.2)
+      psych (>= 4.0.0)
+    reline (0.4.3)
       io-console (~> 0.5)
-    rexml (3.2.5)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.1)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.2)
+    rexml (3.2.6)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.4)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.0)
-    rubygems-tasks (0.2.5)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
+    rubygems-tasks (0.2.6)
       irb (~> 1.0)
+      rake (>= 10.0.0)
     simplecov (0.22.0)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -46,7 +52,8 @@ GEM
       simplecov (~> 0.19)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    thor (1.2.1)
+    stringio (3.1.0)
+    thor (1.3.1)
 
 PLATFORMS
   ruby
@@ -62,4 +69,4 @@ DEPENDENCIES
   tanker-identity!
 
 BUNDLED WITH
-   2.4.1
+   2.5.4
diff --git a/examples/sinatra/Gemfile b/examples/sinatra/Gemfile
index f35cedd..2feba6d 100644
--- a/examples/sinatra/Gemfile
+++ b/examples/sinatra/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
-gem "sinatra", "~> 3.0.5"
+gem "sinatra", "~> 3.2.0"
 gem 'sinatra-cross_origin', "~> 0.4.0"
 gem "tanker-identity", path: "../../"
-gem "thin", "~> 1.8.1"
+gem "thin", "~> 1.8.2"
diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index d83e073..59f1f8b 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -7,37 +7,39 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.2.0)
     daemons (1.4.1)
     eventmachine (1.2.7)
-    ffi (1.15.5)
+    ffi (1.16.3)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.4)
-    rack-protection (3.0.5)
-      rack
+    rack (2.2.8.1)
+    rack-protection (3.2.0)
+      base64 (>= 0.1.0)
+      rack (~> 2.2, >= 2.2.4)
     rbnacl (7.1.1)
       ffi
     ruby2_keywords (0.0.5)
-    sinatra (3.0.5)
+    sinatra (3.2.0)
       mustermann (~> 3.0)
       rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.5)
+      rack-protection (= 3.2.0)
       tilt (~> 2.0)
     sinatra-cross_origin (0.4.0)
-    thin (1.8.1)
+    thin (1.8.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    tilt (2.1.0)
+    tilt (2.3.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 3.0.5)
+  sinatra (~> 3.2.0)
   sinatra-cross_origin (~> 0.4.0)
   tanker-identity!
-  thin (~> 1.8.1)
+  thin (~> 1.8.2)
 
 BUNDLED WITH
-   2.4.1
+   2.5.4