diff --git a/spec/config-spec.coffee b/spec/config-spec.coffee
index f7149e62d..429ab2a1a 100644
--- a/spec/config-spec.coffee
+++ b/spec/config-spec.coffee
@@ -232,7 +232,7 @@ describe "Config", ->
 
     it "emits an updated event", ->
       updatedCallback = jasmine.createSpy('updated')
-      atom.config.observe('foo.bar.baz.a', callNow: false, updatedCallback)
+      atom.config.onDidChange('foo.bar.baz.a', updatedCallback)
       expect(updatedCallback.callCount).toBe 0
       atom.config.setDefaults("foo.bar.baz", a: 2)
       expect(updatedCallback.callCount).toBe 1
diff --git a/src/display-buffer.coffee b/src/display-buffer.coffee
index 0b15bb7c5..fc465e5d7 100644
--- a/src/display-buffer.coffee
+++ b/src/display-buffer.coffee
@@ -59,10 +59,10 @@ class DisplayBuffer extends Model
     @subscribe @buffer.onDidUpdateMarkers @handleBufferMarkersUpdated
     @subscribe @buffer.onDidCreateMarker @handleBufferMarkerCreated
 
-    @subscribe atom.config.observe 'editor.preferredLineLength', callNow: false, =>
+    @subscribe atom.config.onDidChange 'editor.preferredLineLength', =>
       @updateWrappedScreenLines() if @isSoftWrapped() and atom.config.get('editor.softWrapAtPreferredLineLength')
 
-    @subscribe atom.config.observe 'editor.softWrapAtPreferredLineLength', callNow: false, =>
+    @subscribe atom.config.onDidChange 'editor.softWrapAtPreferredLineLength', =>
       @updateWrappedScreenLines() if @isSoftWrapped()
 
     @updateAllScreenLines()
diff --git a/src/package-manager.coffee b/src/package-manager.coffee
index 838eda68e..889a7bdaf 100644
--- a/src/package-manager.coffee
+++ b/src/package-manager.coffee
@@ -260,7 +260,7 @@ class PackageManager
     @disabledPackagesSubscription = null
 
   observeDisabledPackages: ->
-    @disabledPackagesSubscription ?= atom.config.observe 'core.disabledPackages', callNow: false, (disabledPackages, {previous}) =>
+    @disabledPackagesSubscription ?= atom.config.onDidChange 'core.disabledPackages', (disabledPackages, {previous}) =>
       packagesToEnable = _.difference(previous, disabledPackages)
       packagesToDisable = _.difference(disabledPackages, previous)
 
diff --git a/src/text-editor.coffee b/src/text-editor.coffee
index b941f4af0..1e3eba11b 100644
--- a/src/text-editor.coffee
+++ b/src/text-editor.coffee
@@ -113,8 +113,8 @@ class TextEditor extends Model
       @emit 'scroll-left-changed', scrollLeft
       @emitter.emit 'did-change-scroll-left', scrollLeft
 
-    @subscribe atom.config.observe 'editor.showInvisibles', callNow: false, (show) => @updateInvisibles()
-    @subscribe atom.config.observe 'editor.invisibles', callNow: false, => @updateInvisibles()
+    @subscribe atom.config.onDidChange 'editor.showInvisibles', => @updateInvisibles()
+    @subscribe atom.config.onDidChange 'editor.invisibles', => @updateInvisibles()
 
     atom.workspace?.editorAdded(this) if registerEditor