diff --git a/python/3.9/Dockerfile b/python/3.9/Dockerfile
index 0f3a081..e474a63 100644
--- a/python/3.9/Dockerfile
+++ b/python/3.9/Dockerfile
@@ -12,6 +12,7 @@ RUN yum -y groupinstall "Development Tools" \
     libressl-dev \
     openssl-devel \
     postgresql-dev \
+    postgresql-devel \
     sqlite-devel \
     wget \
     which \