diff --git a/Dockerfile.linux b/Dockerfile.linux
index ce0c4ef8..6ca59083 100644
--- a/Dockerfile.linux
+++ b/Dockerfile.linux
@@ -1,7 +1,7 @@
 FROM ubuntu:16.04
 
 ARG THREADS=1
-ARG QT_VERSION=v5.15.4-lts-lgpl
+ARG QT_VERSION=v5.15.5-lts-lgpl
 
 ENV CFLAGS="-fPIC"
 ENV CPPFLAGS="-fPIC"
diff --git a/Dockerfile.windows b/Dockerfile.windows
index 720913dc..7320b8da 100644
--- a/Dockerfile.windows
+++ b/Dockerfile.windows
@@ -1,7 +1,7 @@
 FROM ubuntu:20.04
 
 ARG THREADS=1
-ARG QT_VERSION=v5.15.4-lts-lgpl
+ARG QT_VERSION=v5.15.5-lts-lgpl
 ENV SOURCE_DATE_EPOCH=1397818193
 
 RUN apt update && \