diff --git a/Dockerfile b/Dockerfile
index 8634bcabe3fdee9cf299974d995378b851a65a31..709062a25582343a3e49aad857d7b3a9f3427edd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,9 @@
-FROM python:3.8-slim
+FROM python:3.7-slim
+
+# requirements to build python-ldap
+RUN apt-get update && apt-get install -y \
+    build-essential python3-dev libldap2-dev libsasl2-dev \
+    && rm -rf /var/lib/apt/lists/*
 
 RUN mkdir /app
 WORKDIR /app