diff --git a/src/loadgenerator/Dockerfile b/src/loadgenerator/Dockerfile
index b894dc5..8ce858b 100644
--- a/src/loadgenerator/Dockerfile
+++ b/src/loadgenerator/Dockerfile
@@ -18,10 +18,13 @@ FROM base as builder
 
 RUN apt-get -qq update \
     && apt-get install -y --no-install-recommends \
-        g++
+        g++ libzmq3-dev
 
 COPY requirements.txt .
 
+# Pin Pip version:  unable to build wheel for gevent with PEP 517
+RUN python -m pip install --force-reinstall pip==20.1.1
+
 RUN pip install --prefix="/install" -r requirements.txt
 
 FROM base