diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 3c0bd0b5f7..82d552ef2f 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -1,6 +1,6 @@
 # Stirling-PDF backend-only image — JAR built with -PbuildWithFrontend=false, UI ships separately.
 
-ARG BASE_VERSION=1.0.2:sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
+ARG BASE_VERSION=1.0.2@sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
 ARG BASE_IMAGE=stirlingtools/stirling-pdf-base:${BASE_VERSION}
 
 # Stage 1: Build the Java application (backend only, no frontend)
diff --git a/docker/embedded/Dockerfile b/docker/embedded/Dockerfile
index 8ad25c0db6..ae3e72cf91 100644
--- a/docker/embedded/Dockerfile
+++ b/docker/embedded/Dockerfile
@@ -1,7 +1,7 @@
 # Stirling-PDF - Full version (embedded frontend)
 # Uses pre-built base image for fast builds
 
-ARG BASE_VERSION=1.0.2:sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
+ARG BASE_VERSION=1.0.2@sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
 ARG BASE_IMAGE=stirlingtools/stirling-pdf-base:${BASE_VERSION}
 
 # Stage 1: Build the Java application and frontend
diff --git a/docker/embedded/Dockerfile.fat b/docker/embedded/Dockerfile.fat
index d6c9655de8..6ec6f0e031 100644
--- a/docker/embedded/Dockerfile.fat
+++ b/docker/embedded/Dockerfile.fat
@@ -2,7 +2,7 @@
 # Extra fonts for air-gapped environments
 # Uses pre-built base image for fast builds
 
-ARG BASE_VERSION=1.0.2:sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
+ARG BASE_VERSION=1.0.2@sha256:c7698687f486707ddef9e0298587ca8b44c4e96185e1bdb0c3d119eb2bf9a82e
 ARG BASE_IMAGE=stirlingtools/stirling-pdf-base:${BASE_VERSION}
 
 # Stage 1: Build the Java application and frontend