diff --git a/lib/create_api_gem/forms/requests/create_form_request.rb b/lib/create_api_gem/forms/requests/create_form_request.rb
index e738fc7..754cdbc 100644
--- a/lib/create_api_gem/forms/requests/create_form_request.rb
+++ b/lib/create_api_gem/forms/requests/create_form_request.rb
@@ -23,7 +23,8 @@ def initialize(form, token: APIConfig.token)
       method: :post,
       url: "#{APIConfig.api_request_url}/forms",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: form.payload
     )
diff --git a/lib/create_api_gem/forms/requests/messages/update_messages_request.rb b/lib/create_api_gem/forms/requests/messages/update_messages_request.rb
index 182f654..dde784a 100644
--- a/lib/create_api_gem/forms/requests/messages/update_messages_request.rb
+++ b/lib/create_api_gem/forms/requests/messages/update_messages_request.rb
@@ -21,7 +21,8 @@ def initialize(form, messages, token: APIConfig.token)
       method: :put,
       url: "#{APIConfig.api_request_url}/forms/#{form.id}/messages",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: messages.payload
     )
diff --git a/lib/create_api_gem/forms/requests/update_form_request.rb b/lib/create_api_gem/forms/requests/update_form_request.rb
index ce44273..f5fd23e 100644
--- a/lib/create_api_gem/forms/requests/update_form_request.rb
+++ b/lib/create_api_gem/forms/requests/update_form_request.rb
@@ -23,7 +23,8 @@ def initialize(form, token: APIConfig.token)
       method: :put,
       url: "#{APIConfig.api_request_url}/forms/#{form.id}",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: form.payload
     )
diff --git a/lib/create_api_gem/images/requests/delete_image_request.rb b/lib/create_api_gem/images/requests/delete_image_request.rb
index 8fad2cd..30eb646 100644
--- a/lib/create_api_gem/images/requests/delete_image_request.rb
+++ b/lib/create_api_gem/images/requests/delete_image_request.rb
@@ -23,7 +23,6 @@ def initialize(image, token: APIConfig.token)
       method: :delete,
       url: "#{APIConfig.api_request_url}/images/#{image.id}",
       headers: {
-        'Content-Type' => 'application/json',
         'Authorization' => "Bearer #{token}"
       }
     )
diff --git a/lib/create_api_gem/images/requests/retrieve_all_images_request.rb b/lib/create_api_gem/images/requests/retrieve_all_images_request.rb
index 7bade9e..9e0b0d4 100644
--- a/lib/create_api_gem/images/requests/retrieve_all_images_request.rb
+++ b/lib/create_api_gem/images/requests/retrieve_all_images_request.rb
@@ -23,7 +23,6 @@ def initialize(token: APIConfig.token)
       method: :get,
       url: "#{APIConfig.api_request_url}/images",
       headers: {
-        'Content-Type' => 'application/json',
         'Authorization' => "Bearer #{token}"
       }
     )
diff --git a/lib/create_api_gem/images/requests/retrieve_frame_request.rb b/lib/create_api_gem/images/requests/retrieve_frame_request.rb
index 1ad2d5b..e35fc7f 100644
--- a/lib/create_api_gem/images/requests/retrieve_frame_request.rb
+++ b/lib/create_api_gem/images/requests/retrieve_frame_request.rb
@@ -21,10 +21,7 @@ class RetrieveFrameRequest < ImageRequest
   def initialize(image, frame)
     request(
       method: :get,
-      url: "#{APIConfig.image_api_request_url}/images/#{image.id}/image/default-#{frame}frame.png",
-      headers: {
-        'Content-Type' => 'application/json'
-      }
+      url: "#{APIConfig.image_api_request_url}/images/#{image.id}/image/default-#{frame}frame.png"
     )
   end
 
diff --git a/lib/create_api_gem/images/requests/retrieve_image_request.rb b/lib/create_api_gem/images/requests/retrieve_image_request.rb
index 9080993..34ede2d 100644
--- a/lib/create_api_gem/images/requests/retrieve_image_request.rb
+++ b/lib/create_api_gem/images/requests/retrieve_image_request.rb
@@ -24,7 +24,7 @@ def initialize(image, type: nil, size: nil, accept: nil)
           else
             "#{APIConfig.api_request_url}/images/#{image.id}/#{type}/#{size}"
           end
-    headers = { 'Content-Type' => 'application/json' }
+    headers = { }
     headers['Accept'] = 'application/json' if accept == 'json'
     request(
       method: :get,
diff --git a/lib/create_api_gem/teams/requests/update_team_request.rb b/lib/create_api_gem/teams/requests/update_team_request.rb
index d7ec5c2..ca0e4f9 100644
--- a/lib/create_api_gem/teams/requests/update_team_request.rb
+++ b/lib/create_api_gem/teams/requests/update_team_request.rb
@@ -23,7 +23,8 @@ def initialize(operations, token: APIConfig.token)
       method: :patch,
       url: "#{APIConfig.api_request_url}/teams/mine",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: operations.map(&:payload).to_json
     )
diff --git a/lib/create_api_gem/themes/requests/create_theme_request.rb b/lib/create_api_gem/themes/requests/create_theme_request.rb
index 31d64e3..6384c18 100644
--- a/lib/create_api_gem/themes/requests/create_theme_request.rb
+++ b/lib/create_api_gem/themes/requests/create_theme_request.rb
@@ -23,7 +23,8 @@ def initialize(theme, token: APIConfig.token)
       method: :post,
       url: "#{APIConfig.api_request_url}/themes",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: theme.payload
     )
diff --git a/lib/create_api_gem/themes/requests/update_theme_request.rb b/lib/create_api_gem/themes/requests/update_theme_request.rb
index a260ada..632ab8b 100644
--- a/lib/create_api_gem/themes/requests/update_theme_request.rb
+++ b/lib/create_api_gem/themes/requests/update_theme_request.rb
@@ -23,7 +23,8 @@ def initialize(theme, token: APIConfig.token)
       method: :put,
       url: "#{APIConfig.api_request_url}/themes/#{theme.id}",
       headers: {
-        'Authorization' => "Bearer #{token}"
+        'Authorization' => "Bearer #{token}",
+        'Content-Type' => 'application/json'
       },
       payload: theme.payload
     )
diff --git a/lib/create_api_gem/workspaces/requests/delete_workspace_request.rb b/lib/create_api_gem/workspaces/requests/delete_workspace_request.rb
index 105ef90..83eaa89 100644
--- a/lib/create_api_gem/workspaces/requests/delete_workspace_request.rb
+++ b/lib/create_api_gem/workspaces/requests/delete_workspace_request.rb
@@ -23,8 +23,7 @@ def initialize(workspace, token: APIConfig.token)
       method: :delete,
       url: "#{APIConfig.workspaces_api_request_url}/#{workspace.id}",
       headers: {
-        'Authorization' => "Bearer #{token}",
-        'Content-Type' => 'application/json'
+        'Authorization' => "Bearer #{token}"
       }
     )
   end
diff --git a/lib/create_api_gem/workspaces/requests/retrieve_all_workspaces_request.rb b/lib/create_api_gem/workspaces/requests/retrieve_all_workspaces_request.rb
index 5128836..ead3652 100644
--- a/lib/create_api_gem/workspaces/requests/retrieve_all_workspaces_request.rb
+++ b/lib/create_api_gem/workspaces/requests/retrieve_all_workspaces_request.rb
@@ -28,8 +28,7 @@ def initialize(token: APIConfig.token, workspaces_per_page: 10, page: nil, searc
       method: :get,
       url: url,
       headers: {
-        'Authorization' => "Bearer #{token}",
-        'Content-Type' => 'application/json'
+        'Authorization' => "Bearer #{token}"
       }
     )
   end
diff --git a/lib/create_api_gem/workspaces/requests/retrieve_default_workspace_request.rb b/lib/create_api_gem/workspaces/requests/retrieve_default_workspace_request.rb
index b8c1333..735b9cd 100644
--- a/lib/create_api_gem/workspaces/requests/retrieve_default_workspace_request.rb
+++ b/lib/create_api_gem/workspaces/requests/retrieve_default_workspace_request.rb
@@ -23,8 +23,7 @@ def initialize(token: APIConfig.token)
       method: :get,
       url: "#{APIConfig.workspaces_api_request_url}/default",
       headers: {
-        'Authorization' => "Bearer #{token}",
-        'Content-Type' => 'application/json'
+        'Authorization' => "Bearer #{token}"
       }
     )
   end
diff --git a/lib/create_api_gem/workspaces/requests/retrieve_workspace_request.rb b/lib/create_api_gem/workspaces/requests/retrieve_workspace_request.rb
index aa27f3f..7d7b319 100644
--- a/lib/create_api_gem/workspaces/requests/retrieve_workspace_request.rb
+++ b/lib/create_api_gem/workspaces/requests/retrieve_workspace_request.rb
@@ -23,8 +23,7 @@ def initialize(workspace, token: APIConfig.token)
       method: :get,
       url: "#{APIConfig.workspaces_api_request_url}/#{workspace.id}",
       headers: {
-        'Authorization' => "Bearer #{token}",
-        'Content-Type' => 'application/json'
+        'Authorization' => "Bearer #{token}"
       }
     )
   end