diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45ff8dc..f7e41d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+
+- Make development bootstrap repair a stale globally registered coverage repository URL before
+  selecting it for the repository-local switch.
+
 ## [1.1.0] - 2026-08-26
 
 - Reset the scenario, journal, strategy, execution-configuration, CLI, and diagnostic contracts to
diff --git a/scripts/bootstrap-development-environment b/scripts/bootstrap-development-environment
index 35a9ca2..4f3bf46 100755
--- a/scripts/bootstrap-development-environment
+++ b/scripts/bootstrap-development-environment
@@ -35,10 +35,19 @@ if [ ! -f "$repository_root/_opam/.opam-switch/switch-config" ]; then
 fi
 
 printf '%s\n' "Registering the checksummed OCaml coverage package..."
-opam repository add "$coverage_repository_name" "$coverage_repository" \
-  --rank 1 \
-  --switch "$repository_root" \
-  --yes
+if opam repository list --all --short --color never 2>/dev/null \
+  | grep -Fqx "$coverage_repository_name"; then
+  opam repository set-url "$coverage_repository_name" "$coverage_repository" --yes
+  opam repository add "$coverage_repository_name" \
+    --rank 1 \
+    --switch "$repository_root" \
+    --yes
+else
+  opam repository add "$coverage_repository_name" "$coverage_repository" \
+    --rank 1 \
+    --switch "$repository_root" \
+    --yes
+fi
 
 if opam pin list --switch "$repository_root" --short | grep -Fqx "bisect_ppx"; then
   opam pin remove bisect_ppx \
diff --git a/test/dune b/test/dune
index 34999af..f9cbec6 100644
--- a/test/dune
+++ b/test/dune
@@ -117,6 +117,7 @@
  (alias runtest)
  (deps
   test_development_environment.py
+  ../scripts/bootstrap-development-environment
   ../scripts/check-schema-environment.py)
  (action
   (run python3 %{dep:test_development_environment.py})))
diff --git a/test/test_development_environment.py b/test/test_development_environment.py
index 4534a41..5b5cdd8 100644
--- a/test/test_development_environment.py
+++ b/test/test_development_environment.py
@@ -1,7 +1,10 @@
 from __future__ import annotations
 
 import importlib.util
+import os
 import pathlib
+import shutil
+import subprocess
 import tempfile
 import unittest
 
@@ -53,5 +56,93 @@ def test_reports_missing_mismatched_and_unexpected_packages(self) -> None:
         )
 
 
+class BootstrapEnvironmentTest(unittest.TestCase):
+    def test_repairs_a_registered_repository_before_selecting_it(self) -> None:
+        result, commands, repository_root = self.run_bootstrap(repository_registered=True)
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertIn(
+            f"repository set-url trading-engine-coverage {repository_root / 'opam-repository'} --yes",
+            commands,
+        )
+        self.assertIn(
+            "repository add trading-engine-coverage --rank 1 "
+            f"--switch {repository_root} --yes",
+            commands,
+        )
+
+    def test_registers_a_missing_repository_with_its_local_url(self) -> None:
+        result, commands, repository_root = self.run_bootstrap(repository_registered=False)
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertFalse(any("repository set-url" in command for command in commands))
+        self.assertIn(
+            "repository add trading-engine-coverage "
+            f"{repository_root / 'opam-repository'} --rank 1 "
+            f"--switch {repository_root} --yes",
+            commands,
+        )
+
+    def run_bootstrap(
+        self, *, repository_registered: bool
+    ) -> tuple[subprocess.CompletedProcess[str], list[str], pathlib.Path]:
+        temporary = tempfile.TemporaryDirectory()
+        self.addCleanup(temporary.cleanup)
+        repository_root = pathlib.Path(temporary.name)
+        scripts = repository_root / "scripts"
+        scripts.mkdir()
+        bootstrap = scripts / "bootstrap-development-environment"
+        shutil.copy2(REPOSITORY_ROOT / "scripts" / bootstrap.name, bootstrap)
+        self.write_executable(
+            scripts / "check-development-environment", "#!/bin/sh\nexit 0\n"
+        )
+        (repository_root / "_opam/.opam-switch").mkdir(parents=True)
+        (repository_root / "_opam/.opam-switch/switch-config").touch()
+        schema_bin = repository_root / ".venv-schema/bin"
+        schema_bin.mkdir(parents=True)
+        self.write_executable(schema_bin / "python", "#!/bin/sh\nexit 0\n")
+        (repository_root / "requirements").mkdir()
+        (repository_root / "requirements/schema.lock").touch()
+        (repository_root / "opam-repository").mkdir()
+
+        fake_bin = repository_root / "fake-bin"
+        fake_bin.mkdir()
+        opam_log = repository_root / "opam.log"
+        self.write_executable(
+            fake_bin / "opam",
+            "#!/bin/sh\n"
+            'printf \'%s\\n\' "$*" >> "$OPAM_LOG"\n'
+            'if [ "$1" = repository ] && [ "$2" = list ] '
+            '&& [ "$REPOSITORY_REGISTERED" = 1 ]; then\n'
+            "  printf '%s\\n' trading-engine-coverage\n"
+            "fi\n",
+        )
+        self.write_executable(fake_bin / "uv", "#!/bin/sh\nexit 0\n")
+        self.write_executable(fake_bin / "python3", "#!/bin/sh\nexit 0\n")
+        environment = os.environ.copy()
+        environment.update(
+            {
+                "OPAM_LOG": str(opam_log),
+                "PATH": f"{fake_bin}:{environment['PATH']}",
+                "REPOSITORY_REGISTERED": "1" if repository_registered else "0",
+            }
+        )
+
+        result = subprocess.run(
+            [str(bootstrap)],
+            cwd=repository_root,
+            env=environment,
+            check=False,
+            capture_output=True,
+            text=True,
+        )
+        return result, opam_log.read_text(encoding="utf-8").splitlines(), repository_root
+
+    @staticmethod
+    def write_executable(path: pathlib.Path, contents: str) -> None:
+        path.write_text(contents, encoding="utf-8")
+        path.chmod(0o755)
+
+
 if __name__ == "__main__":
     unittest.main()