diff --git a/.github/workflows/elixir.yaml b/.github/workflows/elixir.yaml
index d0b286f..0dec42c 100644
--- a/.github/workflows/elixir.yaml
+++ b/.github/workflows/elixir.yaml
@@ -48,7 +48,6 @@ jobs:
             "DIR=1.13",
             "DIR=1.13 VARIANT=slim",
             "DIR=1.13 VARIANT=alpine",
-            "DIR=1.13 VARIANT=otp-23-slim",
             "DIR=1.13 VARIANT=otp-25",
             "DIR=1.13 VARIANT=otp-25-slim",
             "DIR=1.13 VARIANT=otp-25-alpine",
diff --git a/1.13/otp-23-slim/Dockerfile b/1.13/otp-23-slim/Dockerfile
deleted file mode 100644
index effe52a..0000000
--- a/1.13/otp-23-slim/Dockerfile
+++ /dev/null
@@ -1,29 +0,0 @@
-FROM erlang:23-slim
-
-# elixir expects utf8.
-ENV ELIXIR_VERSION="v1.13.4" \
-	LANG=C.UTF-8
-
-RUN set -xe \
-	&& ELIXIR_DOWNLOAD_URL="https://github.com/elixir-lang/elixir/archive/${ELIXIR_VERSION}.tar.gz" \
-	&& ELIXIR_DOWNLOAD_SHA256="95daf2dd3052e6ca7d4d849457eaaba09de52d65ca38d6933c65bc1cdf6b8579" \
-	&& buildDeps=' \
-		ca-certificates \
-		curl \
-		make \
-	' \
-	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
-	&& curl -fSL -o elixir-src.tar.gz $ELIXIR_DOWNLOAD_URL \
-	&& echo "$ELIXIR_DOWNLOAD_SHA256  elixir-src.tar.gz" | sha256sum -c - \
-	&& mkdir -p /usr/local/src/elixir \
-	&& tar -xzC /usr/local/src/elixir --strip-components=1 -f elixir-src.tar.gz \
-	&& rm elixir-src.tar.gz \
-	&& cd /usr/local/src/elixir \
-	&& make install clean \
-	&& find /usr/local/src/elixir/ -type f -not -regex "/usr/local/src/elixir/lib/[^\/]*/lib.*" -exec rm -rf {} + \
-	&& find /usr/local/src/elixir/ -type d -depth -empty -delete \
-	&& apt-get purge -y --auto-remove $buildDeps \
-	&& rm -rf /var/lib/apt/lists/*
-
-CMD ["iex"]