diff --git a/testing/centos7-oj11/Dockerfile b/testing/centos7-oj11/Dockerfile
index 80d6d684..32878825 100644
--- a/testing/centos7-oj11/Dockerfile
+++ b/testing/centos7-oj11/Dockerfile
@@ -21,6 +21,7 @@ RUN \
     yum install -y \
         nc \
         wget \
+        ca-certificates \
         && \
     \
     # Install Zulu JDK 11.0.17 \
@@ -31,8 +32,7 @@ RUN \
     \
     # install supervisor
     yum --enablerepo=extras install -y setuptools epel-release && \
-    yum install -y python-pip && \
-    pip install supervisor && \
+    yum install -y supervisor && \
     \
     # install commonly needed packages
     yum install -y \
diff --git a/testing/centos7-oj17/Dockerfile b/testing/centos7-oj17/Dockerfile
index a3d06430..4b08a3a1 100644
--- a/testing/centos7-oj17/Dockerfile
+++ b/testing/centos7-oj17/Dockerfile
@@ -31,8 +31,7 @@ RUN \
     \
     # install supervisor
     yum --enablerepo=extras install -y setuptools epel-release && \
-    yum install -y python-pip && \
-    pip install supervisor && \
+    yum install -y supervisor && \
     \
     # install commonly needed packages
     yum install -y \