diff --git a/docker/app/Dockerfile b/docker/app/Dockerfile
index 1a00e9d..2d30a57 100644
--- a/docker/app/Dockerfile
+++ b/docker/app/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.7-slim-buster
+FROM python:3.8-slim
 
 RUN apt-get update \
   # dependencies for building Python packages
diff --git a/requirements.txt b/requirements.txt
index c3441c5..359bfc9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ enum34==1.1.10
 nose==1.3.7
 requests==2.23.0
 docutils==0.16
-sympy==1.6.2
+sympy==1.12