diff --git a/base/Dockerfile b/base/Dockerfile
index 6e2b609..82a0273 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -44,6 +44,7 @@ RUN apt-get update && apt-get -yqq dist-upgrade && \
     texlive-latex-base \
     texlive-latex-extra \
     unzip \
+    zsh \
     vim \
     && \
     # Setup locales
@@ -143,7 +144,7 @@ USER $NB_USER
 
 RUN echo "Install R and R basic packages" && \
     conda config --add channels conda-forge && \
-    conda install -y \
+    conda install -c r -y \
     'r-essentials=3.5.1' && \
     conda config --add channels ataenzer && \
     conda config --add channels jsignell && \
@@ -151,8 +152,6 @@ RUN echo "Install R and R basic packages" && \
     conda config --add channels omgarcia && \
     conda config --add channels cgat && \
     conda config --add channels sebp && \
-    conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda/ && \
-    conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/ && \
     conda install -y \
     'r-tm' \
     'r-rcolorbrewer' \
@@ -175,8 +174,7 @@ RUN echo "Install R and R basic packages" && \
     install.packages('wordcloud'); \
     install.packages('wordcloud2'); \
     install.packages('xgboost'); \
-    install.packages('plotly');" && \
-    echo 'options("repos" = c(CRAN="https://mirrors.tuna.tsinghua.edu.cn/CRAN/"))' > ~/.Rprofile && \
+    install.packages('plotly');" \
     conda clean -tipsy
 
 # Add Julia packages. Only add HDF5 if this is not a test-only build since