diff --git a/conformance/results/mypy/version.toml b/conformance/results/mypy/version.toml
index e62868b9..aa90cb33 100644
--- a/conformance/results/mypy/version.toml
+++ b/conformance/results/mypy/version.toml
@@ -1,2 +1,2 @@
 version = "mypy 1.11.2"
-test_duration = 12.7
+test_duration = 1.9
diff --git a/conformance/results/pyre/version.toml b/conformance/results/pyre/version.toml
index 4c6e1161..f4f08845 100644
--- a/conformance/results/pyre/version.toml
+++ b/conformance/results/pyre/version.toml
@@ -1,2 +1,2 @@
 version = "pyre 0.9.22"
-test_duration = 4.6
+test_duration = 4.5
diff --git a/conformance/results/pytype/version.toml b/conformance/results/pytype/version.toml
index 9e64b77f..19259c3a 100644
--- a/conformance/results/pytype/version.toml
+++ b/conformance/results/pytype/version.toml
@@ -1,2 +1,2 @@
 version = "pytype 2024.09.13"
-test_duration = 34.1
+test_duration = 32.8
diff --git a/conformance/results/results.html b/conformance/results/results.html
index 4a674700..cffa1e37 100644
--- a/conformance/results/results.html
+++ b/conformance/results/results.html
@@ -159,16 +159,16 @@ <h3>Python Type System Conformance Test Results</h3>
         <div class="table_container"><table><tbody>
 <tr><th class="col1">&nbsp;</th>
 <th class='tc-header'><div class='tc-name'>mypy 1.11.2</div>
-<div class='tc-time'>12.7sec</div>
+<div class='tc-time'>1.9sec</div>
 </th>
 <th class='tc-header'><div class='tc-name'>pyright 1.1.384</div>
 <div class='tc-time'>1.3sec</div>
 </th>
 <th class='tc-header'><div class='tc-name'>pyre 0.9.22</div>
-<div class='tc-time'>4.6sec</div>
+<div class='tc-time'>4.5sec</div>
 </th>
 <th class='tc-header'><div class='tc-name'>pytype 2024.09.13</div>
-<div class='tc-time'>34.1sec</div>
+<div class='tc-time'>32.8sec</div>
 </th>
 </tr>
 <tr><th class="column" colspan="5">
diff --git a/conformance/src/type_checker.py b/conformance/src/type_checker.py
index 90e9f397..c8955c0f 100644
--- a/conformance/src/type_checker.py
+++ b/conformance/src/type_checker.py
@@ -85,6 +85,11 @@ def install(self) -> bool:
                 [sys.executable, "-m", "pip", "install", "mypy"],
                 check=True,
             )
+
+            # Run "mypy --version" to ensure that it's installed and to work
+            # around timing issues caused by malware scanners on some systems.
+            self.get_version()
+
             return True
         except CalledProcessError:
             print("Unable to install mypy")