diff --git a/docker/Dockerfile b/docker/Dockerfile
index 955f6ca..04f88c3 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,7 +1,6 @@
 FROM continuumio/miniconda3:latest
 
-RUN apt-get update && apt-get upgrade -y \
-    && apt-get install -y \
+RUN apt-get update && apt-get install -y \
         build-essential \
         cmake \
         ffmpeg \
@@ -16,13 +15,16 @@ RUN apt-get update && apt-get upgrade -y \
         xvfb \
         zip \
         zlib1g-dev \
+    && apt clean \
     && rm -rf /var/lib/apt/lists/*
 
 COPY environment.yml /tmp/
-RUN conda update -y -n base conda \
-    && echo '    - pyvirtualdisplay' >> /tmp/environment.yml \
+RUN echo '    - pyvirtualdisplay' >> /tmp/environment.yml \
     && conda env create -f /tmp/environment.yml \
-    && conda clean -y -t \
+    && conda clean -afy \
+    && find /opt/conda/ -follow -type f -name '*.a' -delete \
+    && find /opt/conda/ -follow -type f -name '*.pyc' -delete \
+    && find /opt/conda/ -follow -type f -name '*.js.map' -delete \
     && rm /tmp/environment.yml
 
 ARG username