diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3c4906..2308302 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+1.0.1
+-----
+- Remove unused values from default params for the following:
+  - activity_logs_list
+  - ecg_logs_list
+  - sleep_logs_list
+- Fixes bad request errors for `activity_logs_list` endpoint.
+
 1.0.0
 -----
 - BREAKING: Upgrade `oauth2` dependency to v2.0
diff --git a/lib/fitbit_api/activities.rb b/lib/fitbit_api/activities.rb
index 64e5cbf..23227a6 100644
--- a/lib/fitbit_api/activities.rb
+++ b/lib/fitbit_api/activities.rb
@@ -61,7 +61,7 @@ def all_activities
     # @option params :limit [Integer] The max of the number of entries returned (max: 20)
 
     def activity_logs_list(params = {})
-      default_params = { before_date: Date.today, after_date: nil, sort: 'desc', limit: 20, offset: 0 }
+      default_params = { before_date: Date.today, sort: 'desc', limit: 20, offset: 0 }
       get("user/#{user_id}/activities/list.json", default_params.merge(params))
     end
 
diff --git a/lib/fitbit_api/electrocardiogram.rb b/lib/fitbit_api/electrocardiogram.rb
index 8faf793..ad506e2 100644
--- a/lib/fitbit_api/electrocardiogram.rb
+++ b/lib/fitbit_api/electrocardiogram.rb
@@ -16,7 +16,7 @@ class Client
     # @option params :limit [Integer] The max of the number of entries returned (max: 10)
 
     def ecg_logs_list(params = {})
-      default_params = { before_date: Date.today, after_date: nil, sort: 'desc', limit: 10, offset: 0 }
+      default_params = { before_date: Date.today, sort: 'desc', limit: 10, offset: 0 }
       get("user/#{user_id}/ecg/list.json", default_params.merge(params))
     end
   end
diff --git a/lib/fitbit_api/sleep.rb b/lib/fitbit_api/sleep.rb
index d19cbd3..5984b68 100644
--- a/lib/fitbit_api/sleep.rb
+++ b/lib/fitbit_api/sleep.rb
@@ -50,7 +50,7 @@ def sleep_logs_by_date_range(opts = {})
     # @option params :limit [Integer] The max of the number of entries returned (max: 100)
 
     def sleep_logs_list(params = {})
-      default_params = { before_date: Date.today, after_date: nil, sort: 'desc', limit: 20, offset: 0 }
+      default_params = { before_date: Date.today, sort: 'desc', limit: 20, offset: 0 }
       get("user/#{user_id}/sleep/list.json", default_params.merge(params))
     end
 
diff --git a/lib/fitbit_api/version.rb b/lib/fitbit_api/version.rb
index 0a5cfbb..f314b99 100644
--- a/lib/fitbit_api/version.rb
+++ b/lib/fitbit_api/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module FitbitAPI
-  VERSION = '1.0.0'
+  VERSION = '1.0.1'
 end