diff --git a/docs/contributing/code-style.md b/docs/contributing/code-style.md
index 7dd60b6186..e8de6fe3a9 100644
--- a/docs/contributing/code-style.md
+++ b/docs/contributing/code-style.md
@@ -198,8 +198,7 @@ number without any explicit conversion.
 ### JavaScript `const` and `let`
 
 Always declare JavaScript variables using `const` or `let` rather than
-`var`, except in the Casper tests (since Casper does not support
-`const` and `let`).
+`var`.
 
 ### JavaScript and TypeScript `for (i in myArray)`
 
diff --git a/docs/overview/directory-structure.md b/docs/overview/directory-structure.md
index 8de1816ea6..37753cec9b 100644
--- a/docs/overview/directory-structure.md
+++ b/docs/overview/directory-structure.md
@@ -78,7 +78,7 @@ templating systems.
 
 * `frontend_tests/node_tests/` Node Frontend unit tests.
 
-* `frontend_tests/casper_tests/` Casper frontend tests.
+* `frontend_tests/puppeteer_tests/` Puppeteer frontend integration tests.
 
 * `tools/test-*` Developer-facing test runner scripts.
 
diff --git a/docs/subsystems/caching.md b/docs/subsystems/caching.md
index b5ed84c515..7299c2f2a8 100644
--- a/docs/subsystems/caching.md
+++ b/docs/subsystems/caching.md
@@ -211,7 +211,7 @@ time when debugging, since developers don't need to think about things
 like whether some test changed Hamlet's email address and that's why
 login is broken.
 
-More full-stack test suites like `test-js-with-casper` or `test-api`
+More full-stack test suites like `test-js-with-puppeteer` or `test-api`
 use a similar strategy (set a random `KEY_PREFIX` at the start of the
 test run).
 
diff --git a/docs/subsystems/realms.md b/docs/subsystems/realms.md
index cbdfd8927d..c96bb3f98e 100644
--- a/docs/subsystems/realms.md
+++ b/docs/subsystems/realms.md
@@ -84,5 +84,5 @@ lookup should still work even if you disable proxy for
 127.0.0.1    testsubdomain.zulipdev.com
 ```
 
-These records are also useful if you want to e.g. run the casper tests
+These records are also useful if you want to e.g. run the Puppeteer tests
 when you are not connected to the Internet.
diff --git a/docs/subsystems/settings.md b/docs/subsystems/settings.md
index b46db46ae9..ed8a15f626 100644
--- a/docs/subsystems/settings.md
+++ b/docs/subsystems/settings.md
@@ -96,7 +96,7 @@ additionally:
   `zproject/settings.py` and `zproject/test_extra_settings.py`.
 
 * `zproject/test_extra_settings.py` has the (default) settings used
-  for the Zulip tests (both backend and Casper), which are applied on
+  for the Zulip tests (both backend and Puppeteer), which are applied on
   top of the development environment settings.
 
 When adding a new server setting to Zulip, you will typically add it
diff --git a/docs/tutorials/new-feature-tutorial.md b/docs/tutorials/new-feature-tutorial.md
index 27eede9672..43b1b36e2b 100644
--- a/docs/tutorials/new-feature-tutorial.md
+++ b/docs/tutorials/new-feature-tutorial.md
@@ -56,7 +56,7 @@ organization in Zulip). The following files are involved in the process:
   zerver/lib/events.py implementation.
 
 **Frontend testing**
-- `frontend_tests/casper_tests/10-admin.js`: end-to-end tests for the organization
+- `frontend_tests/puppeteer_tests/08-admin.js`: end-to-end tests for the organization
   admin settings pages.
 - `frontend_tests/node_tests/dispatch.js`
 
diff --git a/tools/check-templates b/tools/check-templates
index 957da59058..dbcc7f9c65 100755
--- a/tools/check-templates
+++ b/tools/check-templates
@@ -38,13 +38,8 @@ def check_our_files(modified_only: bool, all_dups: bool, fix: bool, targets: Lis
 def check_html_templates(templates: Iterable[str], all_dups: bool, fix: bool) -> None:
     # Our files with .html extensions are usually for Django, but we also
     # have a few static .html files.
-    #
-    # We also have .html files that we vendored from Casper.
-    # The casperjs files use HTML5 (whereas Zulip prefers XHTML), and
-    # there are also cases where Casper deliberately uses invalid HTML,
-    # so we exclude them from our linter.
     logging.basicConfig(format='%(levelname)s:%(message)s')
-    templates = sorted(fn for fn in templates if 'casperjs' not in fn)
+    templates = sorted(fn for fn in templates)
     # Use of lodash templates <%= %>.
     if 'templates/zerver/team.html' in templates:
         templates.remove('templates/zerver/team.html')
diff --git a/zerver/views/development/registration.py b/zerver/views/development/registration.py
index 8f14bd03c6..849151234f 100644
--- a/zerver/views/development/registration.py
+++ b/zerver/views/development/registration.py
@@ -12,7 +12,7 @@ from zerver.views.auth import create_preregistration_user
 from zerver.views.registration import accounts_register
 
 
-# This is used only by the casper test in 00-realm-creation.js.
+# This is used only by the puppeteer test in 00-realm-creation.js.
 def confirmation_key(request: HttpRequest) -> HttpResponse:
     return json_success(request.session.get('confirmation_key'))
 
diff --git a/zproject/dev_urls.py b/zproject/dev_urls.py
index 03aae63101..9ceaef1622 100644
--- a/zproject/dev_urls.py
+++ b/zproject/dev_urls.py
@@ -28,10 +28,6 @@ urls = [
          serve, {'document_root':
                  os.path.join(settings.DEPLOY_ROOT, 'var/node-coverage/lcov-report'),
                  'show_indexes': True}),
-    path('casper/<path:path>',
-         serve, {'document_root':
-                 os.path.join(settings.DEPLOY_ROOT, 'var/casper'),
-                 'show_indexes': True}),
     path('docs/<path:path>',
          serve, {'document_root':
                  os.path.join(settings.DEPLOY_ROOT, 'docs/_build/html')}),