diff --git a/.github/workflows/test_fast.yml b/.github/workflows/test_fast.yml
index 1d268e90ef..dc57b0d7a4 100644
--- a/.github/workflows/test_fast.yml
+++ b/.github/workflows/test_fast.yml
@@ -108,12 +108,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      # note: exclude python 3.10+ from mypy checks as these produce false
-      # positives in installed libraries for python 3.7
       - name: Configure Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: 3.x
 
       - name: Install
         run: |
diff --git a/cylc/flow/scripts/dump.py b/cylc/flow/scripts/dump.py
index e8dc7fe2cb..fff4090d80 100755
--- a/cylc/flow/scripts/dump.py
+++ b/cylc/flow/scripts/dump.py
@@ -314,7 +314,7 @@ async def dump(workflow_id, options, write=print):
                             result += " (" + ",".join(attrs) + ")"
                         if options.show_flows:
                             result += (
-                                f" flows={item['flowNums'].replace(' ','')}"
+                                f" flows={item['flowNums'].replace(' ', '')}"
                             )
                         write(result)
 
diff --git a/cylc/flow/scripts/show.py b/cylc/flow/scripts/show.py
index d72a3e45d3..c387a3f3fc 100755
--- a/cylc/flow/scripts/show.py
+++ b/cylc/flow/scripts/show.py
@@ -355,7 +355,7 @@ async def prereqs_and_outputs_query(
                 if t_proxy["flowNums"] != "[1]":
                     ansiprint(
                         f"<bold>flows:</bold> "
-                        f"{t_proxy['flowNums'].replace(' ','')}"
+                        f"{t_proxy['flowNums'].replace(' ', '')}"
                     )
 
                 # prerequisites