diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d6d8d8..0958d0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Add more test for unsubscribe/1
 - Add questions section
 - Change default `@eb_tme_unit` to `:microsecond`
+- Change all instances of `micro_seconds` and `microseconds` to `microsecond`, as per Erlang 19+
 
 ## [1.3.X]
 
diff --git a/README.md b/README.md
index 73f9a97..532ea5d 100644
--- a/README.md
+++ b/README.md
@@ -288,7 +288,7 @@ It is recommended to set optional params in event_bus application config, this w
 config :event_bus,
   topics: [], # list of atoms
   ttl: 30_000_000, # integer
-  time_unit: :micro_seconds, # atom
+  time_unit: :microsecond, # atom
   id_generator: EventBus.Util.Base62 # module: must implement 'unique_id/0' function
 ```
 
diff --git a/config/test.exs b/config/test.exs
index 8167bd7..ef6ee54 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -3,5 +3,5 @@ use Mix.Config
 config :event_bus,
   topics: [:metrics_received, :metrics_summed],
   ttl: 30_000_000,
-  time_unit: :micro_seconds,
+  time_unit: :microsecond,
   id_generator: EventBus.Util.String
diff --git a/lib/event_bus/utils/base62.ex b/lib/event_bus/utils/base62.ex
index 0dc1ff4..a00a64a 100644
--- a/lib/event_bus/utils/base62.ex
+++ b/lib/event_bus/utils/base62.ex
@@ -33,9 +33,9 @@ defmodule EventBus.Util.Base62 do
     |> String.pad_leading(size, "0")
   end
 
-  # Current time (microseconds) encoded in base62
+  # Current time (microsecond) encoded in base62
   defp now do
-    encode(System.os_time(:microseconds))
+    encode(System.os_time(:microsecond))
   end
 
   # Assigns a random node_id on first call
diff --git a/test/event_bus/models/event_test.exs b/test/event_bus/models/event_test.exs
index f3d3d91..7788ec7 100644
--- a/test/event_bus/models/event_test.exs
+++ b/test/event_bus/models/event_test.exs
@@ -11,7 +11,7 @@ defmodule EventBus.Model.EventTest do
   end
 
   test "duration" do
-    initialized_at = System.os_time(:micro_seconds)
+    initialized_at = System.os_time(:microsecond)
     # do sth in this frame
     Process.sleep(1)
 
@@ -20,7 +20,7 @@ defmodule EventBus.Model.EventTest do
       topic: "user_created",
       data: %{id: 1, name: "me", email: "me@example.com"},
       initialized_at: initialized_at,
-      occurred_at: System.os_time(:micro_seconds)
+      occurred_at: System.os_time(:microsecond)
     }
 
     assert Event.duration(event) > 0