diff --git a/ci/Dockerfile b/ci/Dockerfile
index a9b9541..a8b7ee6 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -1,8 +1,4 @@
-# current Debian oldstable as of Dec 2023
-# we use Debian because they still provide i386 builds
-# (also, they ship Qt 5.15.2, so we no longer have to rely on third-party builds)
-# and it provides a C++17 compatible compiler out of the box!
-FROM debian:bullseye
+FROM debian:oldstable
 
 ARG ARCH
 ARG DOCKER_ARCH
@@ -17,13 +13,7 @@ RUN apt-get update && \
         build-essential libssl-dev autoconf automake libtool \
         wget vim-common desktop-file-utils pkgconf libgpgme-dev \
         libglib2.0-dev libcairo2-dev librsvg2-dev libfuse-dev git libcurl4-openssl-dev argagg-dev libgcrypt20-dev libboost-dev \
-        liblzma-dev libzstd-dev zlib1g-dev libarchive-dev
-
-RUN wget -qO- https://artifacts.assassinate-you.net/prebuilt-cmake/cmake-v3.28.0-debian-bullseye-"${CMAKE_ARCH}".tar.gz | \
-    tar xzv -C/usr --strip-components=1
-
-COPY ./install-gtest.sh /
-RUN bash /install-gtest.sh
+        liblzma-dev libzstd-dev zlib1g-dev libarchive-dev cmake googletest nlohmann-json3-dev
 
 COPY pkgconfig/*.pc /
 RUN mv /*.pc /usr/lib/*-linux-gnu*/pkgconfig/
@@ -32,17 +22,6 @@ ENV APPIMAGE_EXTRACT_AND_RUN=1
 
 ENV DOCKER=1
 
-#RUN git clone https://github.com/nlohmann/json.git -b v3.11.2 --depth=1 && \
-#    cd json && \
-#    mkdir build && \
-#    cd build && \
-#    cmake .. -DCMAKE_INSTALL_PREFIX=/usr/local && \
-#    make -j "$(nproc --ignore=1)" install && \
-#    cd ../.. && \
-#    rm -rf json/
-
-RUN apt-get update && apt-get install -y nlohmann-json3-dev
-
 # work around bug in FindCURL.cmake, which does not parse the pkg-config provided protocols and features into lists causing
 # the comparison in the loop to yield false negative results
 # this makes it use curl-config which works much better