diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ecd84fb..21418d0 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 21.5b1
+    rev: 21.5b2
     hooks:
     -   id: black
         args: [--safe, --quiet, --target-version, py35]
@@ -17,7 +17,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.16.0
+    rev: v2.19.0
     hooks:
     -   id: pyupgrade
         args: [--py3-plus]
diff --git a/src/xdist/looponfail.py b/src/xdist/looponfail.py
index 19b9313..5ce13a0 100644
--- a/src/xdist/looponfail.py
+++ b/src/xdist/looponfail.py
@@ -61,7 +61,7 @@ class RemoteControl:
 
     def trace(self, *args):
         if self.config.option.debug:
-            msg = " ".join([str(x) for x in args])
+            msg = " ".join(str(x) for x in args)
             print("RemoteControl:", msg)
 
     def initgateway(self):
diff --git a/src/xdist/report.py b/src/xdist/report.py
index 8843b40..02ad30d 100644
--- a/src/xdist/report.py
+++ b/src/xdist/report.py
@@ -16,5 +16,5 @@ def report_collection_diff(from_collection, to_collection, from_id, to_id):
         "The difference is:\n"
         "{diff}"
     ).format(from_id=from_id, to_id=to_id, diff="\n".join(diff))
-    msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
+    msg = "\n".join(x.rstrip() for x in error_message.split("\n"))
     return msg