diff --git a/.github/workflows/cygwin_build.yml b/.github/workflows/cygwin_build.yml
index 0d601df2fa931..0b2d83f3da837 100644
--- a/.github/workflows/cygwin_build.yml
+++ b/.github/workflows/cygwin_build.yml
@@ -21,7 +21,7 @@ jobs:
           HOME: ${{ runner.workspace }}/ardupilot
         run: |
           bash --login -c "ln -sf /usr/bin/python3.7 /usr/bin/python && ln -sf /usr/bin/pip3.7 /usr/bin/pip"
-          bash --login -c "python -m pip install empy pexpect"
+          bash --login -c "python -m pip install empy==3.3.4 pexpect"
           bash --login -c "python -m pip install dronecan --upgrade"
       - name: Build SITL
         env:
diff --git a/Tools/scripts/configure-ci.sh b/Tools/scripts/configure-ci.sh
index 9ec4f55ad0a28..fbd3a30318c05 100755
--- a/Tools/scripts/configure-ci.sh
+++ b/Tools/scripts/configure-ci.sh
@@ -101,5 +101,4 @@ python -m pip install --user -U argparse pyserial pexpect future lxml
 python -m pip install --user -U intelhex
 python -m pip install --user -U numpy
 python -m pip install --user -U edn_format
-python -m pip install --user -U empy
-
+python -m pip install --user -U empy==3.3.4