diff --git a/Dockerfile.tess4 b/Dockerfile.tess4
index d394ec8d..ddbe9cda 100644
--- a/Dockerfile.tess4
+++ b/Dockerfile.tess4
@@ -11,6 +11,8 @@ RUN add-apt-repository ppa:alex-p/tesseract-ocr
 RUN apt-get update && apt-get install -y --no-install-recommends \
 	tesseract-ocr-all
 
+RUN apt-get upgrade tesseract-ocr
+
 RUN apt-get autoremove -y && apt-get clean -y
 
 USER docker