diff --git a/Dockerfile b/Dockerfile
index 52de4e5f..344581d3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,8 +32,9 @@ ARG WGRIB2_VERSION=3.8.0
 # this aligned with rust/prop_grid_rs/Dockerfile.
 # g2c v2.1.0 is the first release where BUILD_G2C defaults ON, which
 # wgrib2 needs at link time (g2c_enc_jpeg2000 / g2c_dec_jpeg2000
-# come from the "new" file-based API).
-ARG G2C_VERSION=2.1.0
+# come from the "new" file-based API). wgrib2 3.8.0 bumps the
+# find_package requirement to g2c >= 2.3.0 (CMakeLists.txt:93).
+ARG G2C_VERSION=2.3.0
 
 # BuildKit cache mounts keep the .deb archive + apt-lists out of the
 # image overlay and on the builder's cache storage, so image layers
@@ -80,7 +81,7 @@ WORKDIR /tmp/wgrib2
 #     exist in wgrib2 3.8.0 — they were silently ignored, leaving
 #     wgrib2 unable to read GRIB2 packing type 40 (HRDPS uses it).
 #     Verified 2026-04-30 by ldd showing only libc/libm linked.
-#   * The g2c v2.1.0 build above carries the actual OpenJPEG support;
+#   * The g2c v2.3.0 build above carries the actual OpenJPEG support;
 #     wgrib2 dispatches to g2c via USE_G2CLIB_LOW.
 RUN wget -q --content-disposition "https://github.com/NOAA-EMC/wgrib2/archive/refs/tags/v${WGRIB2_VERSION}.tar.gz" \
       -O wgrib2.tar.gz \
diff --git a/rust/prop_grid_rs/Dockerfile b/rust/prop_grid_rs/Dockerfile
index 83a83014..0372e397 100644
--- a/rust/prop_grid_rs/Dockerfile
+++ b/rust/prop_grid_rs/Dockerfile
@@ -20,7 +20,8 @@ ARG RUNNER_IMAGE="docker.io/debian:${DEBIAN_VERSION}"
 FROM ${RUNNER_IMAGE} AS wgrib2-builder
 
 ARG WGRIB2_VERSION=3.8.0
-ARG G2C_VERSION=2.1.0
+# wgrib2 3.8.0's CMakeLists.txt requires g2c >= 2.3.0 via find_package.
+ARG G2C_VERSION=2.3.0
 # wgrib2 3.6.0 has a memory-corruption bug exposed by HRDPS rotated
 # lat/lon GRIB2 files plus -lon point extraction: it emits denormal
 # garbage values then aborts with `free(): invalid size`. Reproduced