diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ab18585..f0e344a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,13 +43,6 @@ jobs:
       - name: Prepare directories
         run: bash ci/prepare-dirs.sh
 
-      - name: Cache installed dependencies
-        id: cache-deps
-        uses: actions/cache@v4
-        with:
-          path: ~/local
-          key: ${{ inputs.cache_key }}
-
       - name: Cache Arrow third-party downloads
         id: cache-arrow-thirdparty
         uses: actions/cache@v4
@@ -62,21 +55,14 @@ jobs:
         run: bash ci/free-disk-space.sh
 
       - name: Build and install Greenplum
-        if: steps.cache-deps.outputs.cache-hit != 'true'
         run: bash ci/build-gpdb.sh "${{ inputs.gpdb_repo }}" "${{ inputs.gpdb_ref }}" ${{ inputs.open_gpdb && 'open-gpdb' || '' }}
 
       - name: Build and install Arrow 15
-        if: steps.cache-deps.outputs.cache-hit != 'true'
         run: bash ci/build-arrow.sh
 
       - name: Build and install gRPC
-        if: steps.cache-deps.outputs.cache-hit != 'true'
         run: bash ci/build-grpc.sh
 
-      - name: Verify open-gpdb defines OPENGPDB
-        if: inputs.open_gpdb
-        run: bash ci/verify-opengpdb-define.sh
-
       - name: Build Tea
         run: bash ci/build-tea.sh
 
diff --git a/ci/build-gpdb.sh b/ci/build-gpdb.sh
index c64e8ad..6422f78 100644
--- a/ci/build-gpdb.sh
+++ b/ci/build-gpdb.sh
@@ -1,52 +1,17 @@
 #!/usr/bin/env bash
-# Build and install Greenplum 6 into $HOME/local/gpdb.
-#
-# Usage: build-gpdb.sh <repo-url> <ref> [open-gpdb]
-#
-# Passing "open-gpdb" as the third argument enables the fixups needed for the
-# open-gpdb fork (see the inline comments below); arenadata/gpdb builds without
-# them.
 set -eo pipefail
 
-repo="$1"
-ref="$2"
-mode="${3:-}"
+TARGET_DIR="$HOME/local/gpdb"
+PACKAGE_URL="https://github.com/GreengageDB/greengage/releases/download/6.29.2/greengage6.deb"
 
-git clone "$repo" -b "$ref" --depth 1 gpdb
-cd gpdb
-git submodule update --init
+deb_file=$(mktemp --suffix=.deb)
+curl -sL -o "$deb_file" "$PACKAGE_URL"
+mkdir -p "$TARGET_DIR"
+sudo dpkg -x "$deb_file" "$TARGET_DIR"
+rm -f "$deb_file"
 
-configure_extra=()
-if [ "$mode" = "open-gpdb" ]; then
-  # ORCA in open-gpdb still builds with -std=c++98/gnu++98, but the system
-  # Xerces-C 3.2 (Ubuntu 22.04) requires C++11 (char16_t); bump the ORCA C++
-  # standard to gnu++14 (gnu++17 would reject ORCA's deprecated throw() specs).
-  # gnu++14 + -Wextra then surfaces -Wdeprecated-copy / -Wnonnull-compare which
-  # ORCA's -Werror turns fatal, so append -Wno-error=... last (wins over it).
-  for mk in src/backend/gpopt/gpopt.mk \
-            src/backend/gporca/gporca.mk \
-            src/backend/gporca/libgpos/src/common/Makefile; do
-    sed -i 's/-std=gnu++98/-std=gnu++14/g; s/-std=c++98/-std=gnu++14/g' "$mk"
-    printf '\noverride CPPFLAGS := $(CPPFLAGS) -Wno-error=deprecated-copy -Wno-error=nonnull-compare\n' >> "$mk"
-  done
-  # open-gpdb defaults --with-mdblocales=yes and hard-requires the mdblocales
-  # lib/header, which is not available on the CI image.
-  configure_extra+=(--without-mdblocales)
-fi
+sudo chown -R "$USER:$USER" "$TARGET_DIR"
 
-# TODO(gmusya): consider using --enable-cassert
-./configure --with-perl --with-python --with-libxml --with-gssapi \
-  --with-pythonsrc-ext "${configure_extra[@]}" --prefix="$HOME/local/gpdb"
-
-if [ "$mode" = "open-gpdb" ]; then
-  # src/common (FRONTEND) includes the backend-generated utils/errcodes.h but
-  # has no order-only dep on it, so -j8 races ("errcodes.h: No such file").
-  # Force the generated header first.
-  make -C src/backend submake-errcodes
-fi
-
-make -j8
-make -j8 install
-
-cd ..
-rm -rf gpdb
+mv "$TARGET_DIR/opt/greengagedb/greengage"/* "$TARGET_DIR/" 2>/dev/null || true
+mv "$TARGET_DIR/opt/greengagedb/greengage"/.* "$TARGET_DIR/" 2>/dev/null || true
+rm -rf "$TARGET_DIR/opt"
diff --git a/ci/deploy-tea-config.sh b/ci/deploy-tea-config.sh
index d2c9a02..a3e1fbd 100644
--- a/ci/deploy-tea-config.sh
+++ b/ci/deploy-tea-config.sh
@@ -9,7 +9,7 @@ set -eo pipefail
 
 config="${1:-test/config/tea-config.json}"
 
-source "$HOME/local/gpdb/greenplum_path.sh"
+source "$HOME/local/gpdb/greengage_path.sh"
 mkdir -p "$GPHOME/tea"
 cp "$config" "$GPHOME/tea/tea-config.json"
 cp test/config/tea-config-schema.json "$GPHOME/tea/tea-config-schema.json"
diff --git a/ci/run-smoke.sh b/ci/run-smoke.sh
index 2d13e93..7cad705 100644
--- a/ci/run-smoke.sh
+++ b/ci/run-smoke.sh
@@ -4,7 +4,7 @@
 # Usage: run-smoke.sh <metadata_type> <table_type> <profile>
 set -eo pipefail
 
-source "$HOME/local/gpdb/greenplum_path.sh"
+source "$HOME/local/gpdb/greengage_path.sh"
 export MASTER_DATA_DIRECTORY=/gpdata/master/gpsne-1
 build/tea/smoke_test/smoke_test \
   --metadata_type="$1" \
diff --git a/ci/start-cluster.sh b/ci/start-cluster.sh
index 92fe437..efececc 100644
--- a/ci/start-cluster.sh
+++ b/ci/start-cluster.sh
@@ -12,7 +12,7 @@ sudo locale-gen "ru_RU.CP1251"
 sudo mkdir -p /gpdata
 sudo chown "$USER" /gpdata
 
-source "$HOME/local/gpdb/greenplum_path.sh"
+source "$HOME/local/gpdb/greengage_path.sh"
 export MASTER_DATA_DIRECTORY=/gpdata/master/gpsne-1
 NUM_SEGS=2 bash test/start-gp.sh "$HOME/local/gpdb" /gpdata
 
diff --git a/ci/verify-opengpdb-define.sh b/ci/verify-opengpdb-define.sh
deleted file mode 100644
index 53d490c..0000000
--- a/ci/verify-opengpdb-define.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-# tea relies on the OPENGPDB macro (defined in pg_config_manual.h) to select
-# the open-gpdb sampling API; make sure the freshly built gpdb defines it.
-set -ex
-
-grep -q '#define OPENGPDB' \
-  "$HOME/local/gpdb/include/postgresql/server/pg_config_manual.h"
diff --git a/test/start-gp.sh b/test/start-gp.sh
index 97820ad..ab78abe 100755
--- a/test/start-gp.sh
+++ b/test/start-gp.sh
@@ -22,7 +22,7 @@ done
 
 # Not following ...: does not exist
 # shellcheck disable=SC1091
-source "$gp_root"/greenplum_path.sh
+source "$gp_root"/greengage_path.sh
 
 mkdir "$config_dir" "$master_dir" "${seg_dirs[@]}"
 readonly hostlist="$config_dir/hostlist"