diff --git a/ci/Jenkinsfile b/ci/Jenkinsfile
index e0d37a0..24a3c3d 100644
--- a/ci/Jenkinsfile
+++ b/ci/Jenkinsfile
@@ -70,6 +70,10 @@ pipeline {
     PYTHONPATH = "${SQUISH_DIR}/lib:${SQUISH_DIR}/lib/python:${PYTHONPATH}"
     LD_LIBRARY_PATH = "${SQUISH_DIR}/lib:${SQUISH_DIR}/python3/lib:${LD_LIBRARY_PATH}"
 
+    /* Avoid race conditions with other builds using virtualenv. */
+    VIRTUAL_ENV = "${WORKSPACE_TMP}/venv"
+    PATH = "${VIRTUAL_ENV}/bin:${PATH}"
+
     TESTRAIL_URL = 'https://ethstatus.testrail.net'
     TESTRAIL_PROJECT_ID = 17
 
@@ -87,7 +91,8 @@ pipeline {
 
     stage('Deps') {
       steps { script {
-        sh 'pip3 install --user -r requirements.txt'
+        sh "python3 -m venv ${VIRTUAL_ENV}"
+        sh 'pip3 install -r requirements.txt'
       } }
     }