diff --git a/ci/debian-10/Dockerfile b/ci/debian-10/Dockerfile
index 2a9d29d259..ea5a9ab0b3 100644
--- a/ci/debian-10/Dockerfile
+++ b/ci/debian-10/Dockerfile
@@ -23,14 +23,8 @@ RUN apt-get update && apt-get -y install \
     curl \
     wget \
     xz-utils \
-    clang \
-    libc++-7-dev \
-    libc++abi-7-dev \
   && rm -rf /var/lib/apt/lists/*
 
-RUN update-alternatives --install /usr/bin/cc cc /usr/bin/clang 100
-RUN update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 100
-
 # Many distros adhere to PEP 394's recommendation for `python` = `python2` so
 # this is a simple workaround until we drop Python 2 support and explicitly
 # use `python3` for all invocations (e.g. in shebangs).
@@ -38,5 +32,3 @@ RUN ln -sf /usr/bin/python3 /usr/local/bin/python
 RUN ln -sf /usr/bin/pip3 /usr/local/bin/pip
 
 RUN pip install junit2html
-
-ENV CXXFLAGS=-stdlib=libc++