diff --git a/Dockerfile b/Dockerfile
index d4c2b4b..a2ab3f9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,7 @@
-FROM python:3.8-slim
+FROM python:3.8-slim-bullseye
 
 RUN apt-get update \
 && apt-get upgrade -y \
-&& apt-get -y install gnupg \
-&& apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9 F8D2585B8783D481 6ED0E7B82643E131 BDE6D2B9216EC7A8 648ACFD622F3D138 54404762BBB6E853 \
 && apt-get -y install libspatialindex-dev --no-install-recommends \
 && rm -rf /var/lib/apt/lists/* \
 && /usr/local/bin/python -m pip install --upgrade pip