diff --git a/examples/Example/lake-manifest.json b/examples/Example/lake-manifest.json
index 06e1c0e..2199727 100644
--- a/examples/Example/lake-manifest.json
+++ b/examples/Example/lake-manifest.json
@@ -1,11 +1,12 @@
-{"version": 7,
+{"version": "1.1.0",
  "packagesDir": ".lake/packages",
  "packages":
- [{"url": "https://github.com/leanprover/std4",
+ [{"url": "https://github.com/leanprover-community/batteries",
    "type": "git",
    "subDir": null,
-   "rev": "3025cb124492b423070f20cf0a70636f757d117f",
-   "name": "std",
+   "scope": "",
+   "rev": "2ead90d24b4fac3a05c9c4294daa39bd8686fb98",
+   "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
    "inherited": true,
@@ -13,11 +14,12 @@
   {"url": "https://github.com/leanprover-community/aesop.git",
    "type": "git",
    "subDir": null,
-   "rev": "0a21a48c286c4a4703c0be6ad2045f601f31b1d0",
+   "scope": "",
+   "rev": "a64fe24aa94e21404940e9217363a9a1ed9a33a6",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.8.0-rc1",
+   "inputRev": "v4.10.0-rc1",
    "inherited": false,
-   "configFile": "lakefile.lean"}],
+   "configFile": "lakefile.toml"}],
  "name": "Example",
  "lakeDir": ".lake"}
diff --git a/examples/Example/lakefile.lean b/examples/Example/lakefile.lean
index 52623f0..8759d91 100644
--- a/examples/Example/lakefile.lean
+++ b/examples/Example/lakefile.lean
@@ -2,7 +2,7 @@ import Lake
 open Lake DSL
 
 require aesop from git
-  "https://github.com/leanprover-community/aesop.git" @ "v4.8.0-rc1"
+  "https://github.com/leanprover-community/aesop.git" @ "v4.10.0-rc1"
 
 package Example
 
diff --git a/examples/Example/lean-toolchain b/examples/Example/lean-toolchain
index d8a6d7e..d69d1ed 100644
--- a/examples/Example/lean-toolchain
+++ b/examples/Example/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.8.0-rc1
+leanprover/lean4:v4.10.0-rc1
diff --git a/examples/README.md b/examples/README.md
index 68286fb..5991455 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -19,5 +19,8 @@ poetry run examples/aesop.py
 poetry run examples/data.py
 ```
 
-Warning: If you make modifications to any Lean files, you must re-run `lake build`!
+Warning: If you make modifications to any Lean files, you must re-run `lake
+build`! Moreover, the version of the Lean used in the example folder (including
+dependencies in `lakefile.lean` and `lean-toolchain`) **must match exactly**
+with the version in `src/`!
 
diff --git a/examples/data.py b/examples/data.py
index bb1365b..f1d8978 100755
--- a/examples/data.py
+++ b/examples/data.py
@@ -14,7 +14,7 @@ if __name__ == '__main__':
     print(f"$PWD: {project_path}")
     print(f"$LEAN_PATH: {lean_path}")
     server = Server(imports=['Example'], project_path=project_path, lean_path=lean_path)
-    units, invocations = server.compile_unit("Example")
+    units, invocations = server.tactic_invocations(project_path / "Example.lean")
     for i, u in enumerate(units):
         print(f"==== #{i} ====")
         print(u)
diff --git a/pantograph/server.py b/pantograph/server.py
index ddaeeb1..8595635 100644
--- a/pantograph/server.py
+++ b/pantograph/server.py
@@ -2,13 +2,15 @@
 Class which manages a Pantograph instance. All calls to the kernel uses this
 interface.
 """
-import json, pexpect, pathlib, unittest, os
+import json, pexpect, unittest, os
+from typing import Union
+from pathlib import Path
 from pantograph.expr import parse_expr, Expr, Variable, Goal, GoalState, \
     Tactic, TacticHave, TacticCalc
 from pantograph.compiler import TacticInvocation
 
 def _get_proc_cwd():
-    return pathlib.Path(__file__).parent
+    return Path(__file__).parent
 def _get_proc_path():
     return _get_proc_cwd() / "pantograph-repl"
 
@@ -64,7 +66,7 @@ class Server:
         )
         self.proc.setecho(False) # Do not send any command before this.
         ready = self.proc.readline() # Reads the "ready."
-        assert ready == "ready.\r\n"
+        assert ready == "ready.\r\n", f"Server failed to emit ready signal: {ready}; Maybe the project needs to be rebuilt"
 
         if self.options:
             self.run("options.set", self.options)
@@ -146,17 +148,19 @@ class Server:
             raise ServerError(result["parseError"])
         return GoalState.parse(result, self.to_remove_goal_states)
 
-    def compile_unit(self, module: str) -> tuple[list[str], list[TacticInvocation]]:
-        file_path = self.project_path / (module.replace('.', '/') + '.lean')
-        result = self.run('compile.unit', {
-            'module': module,
-            'compilationUnits': True,
-            'invocations': True
+    def tactic_invocations(self, file_name: Union[str, Path]) -> tuple[list[str], list[TacticInvocation]]:
+        """
+        Collect tactic invocation points in file, and return them.
+        """
+        result = self.run('frontend.process', {
+            'fileName': str(file_name),
+            'invocations': True,
+            "sorrys": False,
         })
         if "error" in result:
             raise ServerError(result["desc"])
 
-        with open(file_path, 'rb') as f:
+        with open(file_name, 'rb') as f:
             content = f.read()
             units = [content[begin:end].decode('utf-8') for begin,end in result['units']]