diff --git a/Dockerfile b/Dockerfile
index 94613dacf1035a914d9ef1110e8295507b63aff9..4cdac57c5c2a6852262f035c231d1dc7c24ebe5e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,8 @@
 FROM python:3.8
 
 RUN apt-get update && apt-get install -y \
+    # requirements for OpenCV
+    libgl1-mesa-dev \
     # requirements to build python-ldap
     build-essential python3-dev libldap2-dev libsasl2-dev \
     && rm -rf /var/lib/apt/lists/*
diff --git a/Dockerfile.nginx b/Dockerfile.nginx
index 88d4d28e096f43ca0ce5f172f5dd51ceabd130a8..d3ed7f54874fdff7f44f36554d650dcebfece1de 100644
--- a/Dockerfile.nginx
+++ b/Dockerfile.nginx
@@ -1,3 +1,3 @@
-FROM nginx
+FROM nginx:1.18
 EXPOSE 8080
 ADD nginx.conf /etc/nginx/conf.d/majak.conf