diff --git a/5/alpine/Dockerfile b/5/alpine/Dockerfile
index 355f2e9e..1416c2c9 100644
--- a/5/alpine/Dockerfile
+++ b/5/alpine/Dockerfile
@@ -4,7 +4,10 @@ FROM node:20-alpine3.22
 
 RUN apk add --no-cache \
 # add "bash" for "[["
-		bash
+		bash \
+# install fontconfig for sharp
+# https://github.com/lovell/sharp/blob/v0.34.2/docs/src/content/docs/install.md#fonts
+		fontconfig
 
 # grab gosu for easy step-down from root
 # https://github.com/tianon/gosu/releases
diff --git a/5/debian/Dockerfile b/5/debian/Dockerfile
index 47ba9dfd..66828d3c 100644
--- a/5/debian/Dockerfile
+++ b/5/debian/Dockerfile
@@ -2,6 +2,13 @@
 # https://github.com/nodejs/Release (looking for "LTS")
 FROM node:20-bookworm-slim
 
+RUN set -eux; \
+	apt-get update; \
+# install fontconfig for sharp
+# https://github.com/lovell/sharp/blob/v0.34.2/docs/src/content/docs/install.md#fonts
+	apt-get install -y --no-install-recommends fontconfig; \
+	rm -rf /var/lib/apt/lists/*
+
 # grab gosu for easy step-down from root
 # https://github.com/tianon/gosu/releases
 ENV GOSU_VERSION 1.19
diff --git a/6/alpine/Dockerfile b/6/alpine/Dockerfile
index 5a982b1e..bf7c525f 100644
--- a/6/alpine/Dockerfile
+++ b/6/alpine/Dockerfile
@@ -4,7 +4,10 @@ FROM node:22-alpine3.22
 
 RUN apk add --no-cache \
 # add "bash" for "[["
-		bash
+		bash \
+# install fontconfig for sharp
+# https://github.com/lovell/sharp/blob/v0.34.2/docs/src/content/docs/install.md#fonts
+		fontconfig
 
 # grab gosu for easy step-down from root
 # https://github.com/tianon/gosu/releases
diff --git a/6/debian/Dockerfile b/6/debian/Dockerfile
index aeb06880..7a6eea7f 100644
--- a/6/debian/Dockerfile
+++ b/6/debian/Dockerfile
@@ -2,6 +2,13 @@
 # https://github.com/nodejs/Release (looking for "LTS")
 FROM node:22-bookworm-slim
 
+RUN set -eux; \
+	apt-get update; \
+# install fontconfig for sharp
+# https://github.com/lovell/sharp/blob/v0.34.2/docs/src/content/docs/install.md#fonts
+	apt-get install -y --no-install-recommends fontconfig; \
+	rm -rf /var/lib/apt/lists/*
+
 # grab gosu for easy step-down from root
 # https://github.com/tianon/gosu/releases
 ENV GOSU_VERSION 1.19