diff --git a/Dockerfile b/Dockerfile
index 3d662eec8d..f663c1751d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -178,13 +178,13 @@ RUN set -eux; \
     arch="$(dpkg --print-architecture)"; arch="${arch##*-}"; \
     case "$arch" in \
     'amd64') \
-    targz='go1.21.5.linux-amd64.tar.gz'; \
+    targz='go1.21.6.linux-amd64.tar.gz'; \
     ;; \
     'arm64') \
-    targz='go1.21.5.linux-arm64.tar.gz'; \
+    targz='go1.21.6.linux-arm64.tar.gz'; \
     ;; \
     'armhf') \
-    targz='go1.21.5.linux-armv6l.tar.gz'; \
+    targz='go1.21.6.linux-armv6l.tar.gz'; \
     ;; \
     *) echo >&2 "error: unsupported architecture '$arch' (likely packaging update needed)"; exit 1 ;; \
     esac; \