diff --git a/Dockerfile b/Dockerfile
index 8abb569..dc89006 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,15 +1,16 @@
-FROM python:3.8.3-slim-buster
-ARG PELICAN_VERSION=4.2.0
-ARG SOURCE_CODE_PRO_VERSION=3.006R
-ARG MATPLOTLIB_VERSION=3.2.1
+FROM python:3.9.4-slim-buster
+ARG PELICAN_VERSION=4.6.0
+ARG SOURCE_SANS_VERSION=3.028R
+ARG MATPLOTLIB_VERSION=3.4.1
 RUN apt update && apt upgrade -y
 RUN apt install wget unzip fontconfig -y
-RUN wget https://github.com/adobe-fonts/source-sans-pro/releases/download/${SOURCE_CODE_PRO_VERSION}/source-sans-pro-${SOURCE_CODE_PRO_VERSION}.zip && \
-    unzip source-sans-pro-${SOURCE_CODE_PRO_VERSION}.zip && \
-    rm source-sans-pro-${SOURCE_CODE_PRO_VERSION}.zip && \
+
+RUN wget https://github.com/adobe-fonts/source-sans/releases/download/${SOURCE_SANS_VERSION}/source-sans-3v028R.zip && \
+    unzip source-sans-3v028R.zip -d source-sans && \
+    rm source-sans-3v028R.zip && \
     mkdir -p /usr/share/fonts/opentype/adobe/ && \
-    cp source-sans-pro-${SOURCE_CODE_PRO_VERSION}/OTF/*.otf /usr/share/fonts/opentype/adobe/ && \
-    rm -rf source-sans-pro-${SOURCE_CODE_PRO_VERSION} && \
+    cp source-sans/OTF/*.otf /usr/share/fonts/opentype/adobe/ && \
+    rm -rf source-sans && \
     fc-cache -f -v
 RUN apt install -y \
     texlive-base \
diff --git a/README.md b/README.md
index 7e6d68f..13b9116 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ docker run --detach \
 --name=pelican \
 --volume <your-site-dir>:/site \
 --volume pelican_files:/site-generated \
-boonto/pelican:3.8.1-4.2.0
+boonto/pelican:3.9.4-4.6.0
 ```
 May be used in conjunction with the [nginx](https://hub.docker.com/_/nginx) container to serve the output.
 ```
@@ -19,4 +19,4 @@ docker run --detach \
 --volume pelican_files:/usr/share/nginx/html:ro \
 nginx
 ```
-Also provides `matplotlib`, `latex` and the [Source Code Pro](https://github.com/adobe-fonts/source-code-pro) font for use with the [m.css](https://mcss.mosra.cz/themes/pelican/) Pelican theme.
\ No newline at end of file
+Also provides `matplotlib`, `latex` and the [Source Sans](https://github.com/adobe-fonts/source-sans) font for use with the [m.css](https://mcss.mosra.cz/themes/pelican/) Pelican theme.
\ No newline at end of file