actions
diff --git a/‎action.yml
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diff --git a/‎main.js
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diff --git a/‎tests/main-missing-private-key.test.js
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diff --git a/‎tests/snapshots/index.js.md
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diff --git a/‎tests/snapshots/index.js.snap
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-48 Bytes b/‎tests/snapshots/index.js.snap
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@@ -10,11 +10,7 @@ inputs:
     required: true
   private-key:
     description: "GitHub App private key"
-    required: false # TODO: When 'private_key' is removed, make 'private-key' required
-  private_key:
-    description: "GitHub App private key"
-    required: false
-    deprecationMessage: "'private_key' is deprecated and will be removed in a future version. Use 'private-key' instead."
+    required: true
   owner:
     description: "The owner of the GitHub App installation (defaults to current repository owner)"
     required: false
 
@@ -15,11 +15,7 @@ if (!process.env.GITHUB_REPOSITORY_OWNER) {
 }
 
 const appId = core.getInput("app-id");
-const privateKey = core.getInput("private-key") || core.getInput("private_key");
-if (!privateKey) {
-  // The 'private_key' input was previously required, but it and 'private-key' are both optional now, until the former is removed. Still, we want to ensure that at least one of them is set.
-  throw new Error("Input required and not supplied: private-key");
-}
+const privateKey = core.getInput("private-key")
 const owner = core.getInput("owner");
 const repositories = core.getInput("repositories")
   .split(/[\n,]+/)
 
@@ -12,8 +12,7 @@ Generated by [AVA](https://avajs.dev).
 
 > stdout
 
-    `private_key — 'private_key' is deprecated and will be removed in a future version. Use 'private-key' instead.␊
-    skip_token_revoke — 'skip_token_revoke' is deprecated and will be removed in a future version. Use 'skip-token-revoke' instead.`
+    'skip_token_revoke — \'skip_token_revoke\' is deprecated and will be removed in a future version. Use \'skip-token-revoke\' instead.'
 
 ## main-custom-github-api-url.test.js
 
@@ -44,16 +43,6 @@ Generated by [AVA](https://avajs.dev).
 
     ''
 
-## main-missing-private-key.test.js
-
-> stderr
-
-    'Input required and not supplied: private-key'
-
-> stdout
-
-    ''
-
 ## main-missing-repository.test.js
 
 > stderr