diff --git a/dockerfiles/geospatial-dev-osgeo_4.3.3.Dockerfile b/dockerfiles/geospatial-dev-osgeo_4.3.3.Dockerfile
index c6e254f5..c2500ddf 100644
--- a/dockerfiles/geospatial-dev-osgeo_4.3.3.Dockerfile
+++ b/dockerfiles/geospatial-dev-osgeo_4.3.3.Dockerfile
@@ -5,7 +5,7 @@ LABEL org.opencontainers.image.licenses="GPL-2.0-or-later" \
       org.opencontainers.image.vendor="Rocker Project" \
       org.opencontainers.image.authors="Carl Boettiger <cboettig@ropensci.org>"
 
-ENV PROJ_VERSION=9.3.1
+ENV PROJ_VERSION=9.4.0
 ENV GDAL_VERSION=3.8.4
 ENV GEOS_VERSION=3.12.1
 
diff --git a/stacks/extra.json b/stacks/extra.json
index 55837609..f0258f87 100644
--- a/stacks/extra.json
+++ b/stacks/extra.json
@@ -57,7 +57,7 @@
       },
       "FROM": "rocker/verse:4.3.3",
       "ENV": {
-        "PROJ_VERSION": "9.3.1",
+        "PROJ_VERSION": "9.4.0",
         "GDAL_VERSION": "3.8.4",
         "GEOS_VERSION": "3.12.1"
       },