diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index 1b1134fdd..9a6317bae 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -57,6 +57,7 @@ RUN case "$TARGETARCH" in \
 
 # Copy real sources and rebuild (only application code recompiles)
 COPY crates/ crates/
+COPY plugins/dialects/ plugins/dialects/
 
 # Docker COPY preserves original file timestamps, which may be older than the
 # dummy-source binary compiled above. Touch all .rs files so cargo detects the