diff --git a/Dockerfile b/Dockerfile
index d6198c26f69d2fa5e65c2b43ccbd072e729f192d..dcbbc6105e5e7425257f5012d63b8e0d9221d0e2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@
 # IN THE SOFTWARE.
 
 
-FROM registry.conarx.tech/containers/nginx-php/3.20 as builder
+FROM registry.conarx.tech/containers/nginx-php/3.21 as builder
 
 
 # UPDATE timescaledb version in tests/docker-compose.yml.timescaledb.tmpl to the max supported version
@@ -314,13 +314,13 @@ RUN set -eux; \
 
 
 
-FROM registry.conarx.tech/containers/nginx-php/3.20
+FROM registry.conarx.tech/containers/nginx-php/3.21
 
 
 ARG VERSION_INFO=
 LABEL org.opencontainers.image.authors   = "Nigel Kukard <nkukard@conarx.tech>"
-LABEL org.opencontainers.image.version   = "3.20"
-LABEL org.opencontainers.image.base.name = "registry.conarx.tech/containers/nginx-php/3.20"
+LABEL org.opencontainers.image.version   = "3.21"
+LABEL org.opencontainers.image.base.name = "registry.conarx.tech/containers/nginx-php/3.21"
 
 
 # Copy in built binaries