diff --git a/Jenkinsfile b/Jenkinsfile
index dde389f..1c43812 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -143,18 +143,12 @@ pipeline {
                     call C:\\Instrument\\Apps\\EPICS\\swap_galil.bat NEW
             )
             call clean_files.bat
-            @echo FIRST PART OF TESTS STARTED
-            call run_tests.bat
-            set errcode1=%errorlevel%
-            if %errcode1% NEQ 0 (
-                @echo ERROR: FIRST PART OF TESTS FAILED WITH CODE %errcode1%
-            ) else (
-                @echo OK: FIRST PART OF TESTS SUCCEEDED
-            )
+
             @echo SECOND PART OF TESTS STARTED
             @echo Running IOC tests on node ${env.NODE_NAME}
             pushd "C:\\Instrument\\Apps\\EPICS"
             call config_env.bat
+            python -m pip install git+https://github.com/ISISComputingGroup/lewis@c79836a93d62b93a5a43a3398d664b246e975b31
             REM make will usually stop on first test failure as python will return an error. We can pass -i to make to ignore
             REM this and we will still usually see a problem as the python unittest XML output will list it, but we miss
             REM the case when python crashes with no XML output. So we will try using -k which looks to "keep going"