diff --git a/NEWS.md b/NEWS.md
index c975240..fd988a0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,4 +12,7 @@
 
 ### Fixed
 
+- Use Octokit's `add_label` instead of the nonexistent `create_label` when
+  creating missing labels, which raised `NoMethodError` with Octokit v10.
+
 ### Security
diff --git a/lib/github_client.rb b/lib/github_client.rb
index 79ef91f..82d889e 100644
--- a/lib/github_client.rb
+++ b/lib/github_client.rb
@@ -55,7 +55,7 @@ def ensure_labels(labels)
       existing = list_label_names
       labels.each do |label|
         next if existing.include?(label)
-        @client.create_label(@repo, label, "0075ca")
+        @client.add_label(@repo, label, "0075ca")
       end
     end
 
diff --git a/test/github_client_test.rb b/test/github_client_test.rb
index aa156aa..eebcae7 100644
--- a/test/github_client_test.rb
+++ b/test/github_client_test.rb
@@ -88,19 +88,19 @@ def test_ensure_labels_is_a_no_op_when_labels_is_empty
 
   def test_ensure_labels_creates_missing_labels
     @octokit.expect(:labels, [label_stub("dependencies")], [REPO])
-    @octokit.expect(:create_label, nil, [REPO, "javascript", "0075ca"])
+    @octokit.expect(:add_label, nil, [REPO, "javascript", "0075ca"])
     @client.ensure_labels(%w[dependencies javascript])
   end
 
   def test_ensure_labels_skips_labels_that_already_exist
     @octokit.expect(:labels, [label_stub("dependencies"), label_stub("javascript")], [REPO])
-    # No create_label calls expected.
+    # No add_label calls expected.
     @client.ensure_labels(%w[dependencies javascript])
   end
 
   def test_ensure_labels_tolerates_labels_list_failure
     @octokit.expect(:labels, nil) { |_repo| raise Octokit::Error }
-    @octokit.expect(:create_label, nil, [REPO, "dependencies", "0075ca"])
+    @octokit.expect(:add_label, nil, [REPO, "dependencies", "0075ca"])
     @client.ensure_labels(%w[dependencies])
   end