diff --git a/Gemfile b/Gemfile
index 80c7989..216d41d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,4 @@ gem "dotenv", "~> 2.7"
 
 gem "json-canonicalization", "~> 0.2.0"
 
-gem "httparty", "~> 0.18.0"
+gem "httparty", "~> 0.21.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 1e01780..1ad4cb1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,13 +3,11 @@ GEM
   specs:
     dotenv (2.7.5)
     ed25519 (1.2.4)
-    httparty (0.18.0)
-      mime-types (~> 3.0)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
     json-canonicalization (0.2.0)
-    mime-types (3.3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2020.0425)
+    mini_mime (1.1.2)
     multi_xml (0.6.0)
 
 PLATFORMS
@@ -18,7 +16,7 @@ PLATFORMS
 DEPENDENCIES
   dotenv (~> 2.7)
   ed25519 (~> 1.2)
-  httparty (~> 0.18.0)
+  httparty (~> 0.21.0)
   json-canonicalization (~> 0.2.0)
 
 BUNDLED WITH