diff --git a/6/alpine3.23/Dockerfile b/6/alpine3.23/Dockerfile
index 14c9a9a4..49493f44 100644
--- a/6/alpine3.23/Dockerfile
+++ b/6/alpine3.23/Dockerfile
@@ -51,7 +51,7 @@ RUN set -eux; \
 ENV GHOST_INSTALL /var/lib/ghost
 ENV GHOST_CONTENT /var/lib/ghost/content
 
-ENV GHOST_VERSION 6.32.0
+ENV GHOST_VERSION 6.35.0
 
 RUN set -eux; \
 	mkdir -p "$GHOST_INSTALL"; \
@@ -84,7 +84,7 @@ RUN set -eux; \
 	\
 	# test that the optional dependencies are installed and loadable
 	cd current; \
-	gosu node node -e 'require("sqlite3"); require("sharp");'
+	gosu node node -e 'require("sqlite3"); if (!require("@tryghost/image-transform").canTransformFiles()) throw new Error("sharp not installed");'
 
 WORKDIR $GHOST_INSTALL
 VOLUME $GHOST_CONTENT
diff --git a/6/bookworm/Dockerfile b/6/bookworm/Dockerfile
index a6839ef9..77d4d787 100644
--- a/6/bookworm/Dockerfile
+++ b/6/bookworm/Dockerfile
@@ -48,7 +48,7 @@ RUN set -eux; \
 ENV GHOST_INSTALL /var/lib/ghost
 ENV GHOST_CONTENT /var/lib/ghost/content
 
-ENV GHOST_VERSION 6.32.0
+ENV GHOST_VERSION 6.35.0
 
 RUN set -eux; \
 	mkdir -p "$GHOST_INSTALL"; \
@@ -86,7 +86,7 @@ RUN set -eux; \
 	\
 	# test that the optional dependencies are installed and loadable
 	cd current; \
-	gosu node node -e 'require("sqlite3"); require("sharp");'
+	gosu node node -e 'require("sqlite3"); if (!require("@tryghost/image-transform").canTransformFiles()) throw new Error("sharp not installed");'
 
 WORKDIR $GHOST_INSTALL
 VOLUME $GHOST_CONTENT
diff --git a/Dockerfile.template b/Dockerfile.template
index 91d42714..f8916bd2 100644
--- a/Dockerfile.template
+++ b/Dockerfile.template
@@ -117,7 +117,7 @@ RUN set -eux; \
 	\
 	# test that the optional dependencies are installed and loadable
 	cd current; \
-	gosu node node -e 'require("sqlite3"); require("sharp");'
+	gosu node node -e 'require("sqlite3"); if (!require("@tryghost/image-transform").canTransformFiles()) throw new Error("sharp not installed");'
 
 WORKDIR $GHOST_INSTALL
 VOLUME $GHOST_CONTENT
diff --git a/versions.json b/versions.json
index 57015913..1bf389f6 100644
--- a/versions.json
+++ b/versions.json
@@ -1,6 +1,6 @@
 {
   "6": {
-    "version": "6.32.0",
+    "version": "6.35.0",
     "cli": {
       "version": "1.29.2"
     },