diff --git a/automation/build/debian/unstable-llvm-8.list b/automation/build/debian/unstable-llvm-8.list
deleted file mode 100644
index dc119fa0b4..0000000000
--- a/automation/build/debian/unstable-llvm-8.list
+++ /dev/null
@@ -1,3 +0,0 @@
-# Unstable LLVM 8 repos
-deb http://apt.llvm.org/unstable/ llvm-toolchain-8 main
-deb-src http://apt.llvm.org/unstable/ llvm-toolchain-8 main
diff --git a/automation/build/debian/unstable.dockerfile b/automation/build/debian/unstable.dockerfile
index 9de766d596..b560337b7a 100644
--- a/automation/build/debian/unstable.dockerfile
+++ b/automation/build/debian/unstable.dockerfile
@@ -51,15 +51,3 @@ RUN apt-get update && \
         apt-get autoremove -y && \
         apt-get clean && \
         rm -rf /var/lib/apt/lists* /tmp/* /var/tmp/*
-
-RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|apt-key add -
-COPY unstable-llvm-8.list /etc/apt/sources.list.d/
-
-RUN apt-get update && \
-    apt-get --quiet --yes install \
-        clang-8 \
-        lld-8 \
-        && \
-        apt-get autoremove -y && \
-        apt-get clean && \
-        rm -rf /var/lib/apt/lists* /tmp/* /var/tmp/*
diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index aed8fc0240..22ce1c45e7 100644
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -329,16 +329,6 @@ debian-unstable-clang-debug:
   variables:
     CONTAINER: debian:unstable
 
-debian-unstable-clang-8:
-  extends: .clang-8-x86-64-build
-  variables:
-    CONTAINER: debian:unstable
-
-debian-unstable-clang-8-debug:
-  extends: .clang-8-x86-64-build-debug
-  variables:
-    CONTAINER: debian:unstable
-
 debian-unstable-gcc:
   extends: .gcc-x86-64-build
   variables: