diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 6579c52d9..54b2df65e 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -108,6 +108,18 @@ RUN mkdir .pgenv-staging/
 RUN cp -r .pgenv/src .pgenv/pgsql-* .pgenv/config .pgenv-staging/
 RUN rm .pgenv-staging/config/default.conf
 
+FROM base AS pg18
+RUN MAKEFLAGS="-j $(nproc)" pgenv build 18beta3
+RUN rm .pgenv/src/*.tar*
+RUN make -C .pgenv/src/postgresql-*/ clean
+RUN make -C .pgenv/src/postgresql-*/src/include install
+
+# Stage the pgenv artifacts for PG18
+RUN mkdir .pgenv-staging/
+RUN cp -r .pgenv/src .pgenv/pgsql-* .pgenv/config .pgenv-staging/
+RUN rm .pgenv-staging/config/default.conf
+
+
 FROM base AS uncrustify-builder
 
 RUN sudo apt update && sudo apt install -y cmake tree
@@ -201,6 +213,7 @@ COPY --link --from=uncrustify-builder /uncrustify/usr/ /usr/
 COPY --link --from=pg15 /home/citus/.pgenv-staging/ /home/citus/.pgenv/
 COPY --link --from=pg16 /home/citus/.pgenv-staging/ /home/citus/.pgenv/
 COPY --link --from=pg17 /home/citus/.pgenv-staging/ /home/citus/.pgenv/
+COPY --link --from=pg18 /home/citus/.pgenv-staging/ /home/citus/.pgenv/
 
 COPY --link --from=pipenv /home/citus/.local/share/virtualenvs/ /home/citus/.local/share/virtualenvs/
 
@@ -216,7 +229,7 @@ COPY --chown=citus:citus .psqlrc .
 RUN sudo chown --from=root:root citus:citus -R ~
 
 # sets default pg version
-RUN pgenv switch 17.6
+RUN pgenv switch 18beta3
 
 # make connecting to the coordinator easy
 ENV PGPORT=9700
diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 2d06e262b..3e1ea4db7 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -31,12 +31,13 @@ jobs:
       pgupgrade_image_name: "ghcr.io/citusdata/pgupgradetester"
       style_checker_image_name: "ghcr.io/citusdata/stylechecker"
       style_checker_tools_version: "0.8.18"
-      sql_snapshot_pg_version: "17.6"
-      image_suffix: "-v4df94a0"
-      pg15_version: '{ "major": "15", "full": "15.14" }'
-      pg16_version: '{ "major": "16", "full": "16.10" }'
-      pg17_version: '{ "major": "17", "full": "17.6" }'
-      upgrade_pg_versions: "15.14-16.10-17.6"
+      sql_snapshot_pg_version: "17.5"
+      image_suffix: "-dev-8e2a1ce"
+      pg15_version: '{ "major": "15", "full": "15.13" }'
+      pg16_version: '{ "major": "16", "full": "16.9" }'
+      pg17_version: '{ "major": "17", "full": "17.5" }'
+      pg18_version: '{ "major": "18", "full": "18beta3" }'
+      upgrade_pg_versions: "15.13-16.9-17.5-18beta3"
     steps:
       # Since GHA jobs need at least one step we use a noop step here.
       - name: Set up parameters
@@ -113,6 +114,7 @@ jobs:
           - ${{ needs.params.outputs.pg15_version }}
           - ${{ needs.params.outputs.pg16_version }}
           - ${{ needs.params.outputs.pg17_version }}
+          - ${{ needs.params.outputs.pg18_version }}
     runs-on: ubuntu-latest
     container:
       image: "${{ matrix.image_name }}:${{ fromJson(matrix.pg_version).full }}${{ matrix.image_suffix }}"
@@ -144,6 +146,7 @@ jobs:
           - ${{ needs.params.outputs.pg15_version }}
           - ${{ needs.params.outputs.pg16_version }}
           - ${{ needs.params.outputs.pg17_version }}
+          - ${{ needs.params.outputs.pg18_version }}
         make:
           - check-split
           - check-multi
@@ -174,6 +177,10 @@ jobs:
             pg_version: ${{ needs.params.outputs.pg17_version }}
             suite: regress
             image_name: ${{ needs.params.outputs.fail_test_image_name }}
+          - make: check-failure
+            pg_version: ${{ needs.params.outputs.pg18_version }}
+            suite: regress
+            image_name: ${{ needs.params.outputs.fail_test_image_name }}
           - make: check-enterprise-failure
             pg_version: ${{ needs.params.outputs.pg15_version }}
             suite: regress
@@ -186,6 +193,10 @@ jobs:
             pg_version: ${{ needs.params.outputs.pg17_version }}
             suite: regress
             image_name: ${{ needs.params.outputs.fail_test_image_name }}
+          - make: check-enterprise-failure
+            pg_version: ${{ needs.params.outputs.pg18_version }}
+            suite: regress
+            image_name: ${{ needs.params.outputs.fail_test_image_name }}
           - make: check-pytest
             pg_version: ${{ needs.params.outputs.pg15_version }}
             suite: regress
@@ -198,6 +209,10 @@ jobs:
             pg_version: ${{ needs.params.outputs.pg17_version }}
             suite: regress
             image_name: ${{ needs.params.outputs.fail_test_image_name }}
+          - make: check-pytest
+            pg_version: ${{ needs.params.outputs.pg18_version }}
+            suite: regress
+            image_name: ${{ needs.params.outputs.fail_test_image_name }}
           - make: installcheck
             suite: cdc
             image_name: ${{ needs.params.outputs.test_image_name }}
@@ -210,6 +225,10 @@ jobs:
             suite: cdc
             image_name: ${{ needs.params.outputs.test_image_name }}
             pg_version: ${{ needs.params.outputs.pg17_version }}
+          - make: installcheck
+            suite: cdc
+            image_name: ${{ needs.params.outputs.test_image_name }}
+            pg_version: ${{ needs.params.outputs.pg18_version }}
           - make: check-query-generator
             pg_version: ${{ needs.params.outputs.pg15_version }}
             suite: regress
@@ -222,6 +241,10 @@ jobs:
             pg_version: ${{ needs.params.outputs.pg17_version }}
             suite: regress
             image_name: ${{ needs.params.outputs.fail_test_image_name }}
+          - make: check-query-generator
+            pg_version: ${{ needs.params.outputs.pg18_version }}
+            suite: regress
+            image_name: ${{ needs.params.outputs.fail_test_image_name }}
     runs-on: ubuntu-latest
     container:
       image: "${{ matrix.image_name }}:${{ fromJson(matrix.pg_version).full }}${{ needs.params.outputs.image_suffix }}"
@@ -265,6 +288,7 @@ jobs:
           - ${{ needs.params.outputs.pg15_version }}
           - ${{ needs.params.outputs.pg16_version }}
           - ${{ needs.params.outputs.pg17_version }}
+          - ${{ needs.params.outputs.pg18_version }}
         parallel: [0,1,2,3,4,5] # workaround for running 6 parallel jobs
     steps:
     - uses: actions/checkout@v4
@@ -315,6 +339,10 @@ jobs:
             new_pg_major: 17
           - old_pg_major: 15
             new_pg_major: 17
+          - old_pg_major: 17
+            new_pg_major: 18
+          - old_pg_major: 16
+            new_pg_major: 18
     env:
       old_pg_major: ${{ matrix.old_pg_major }}
       new_pg_major: ${{ matrix.new_pg_major }}
@@ -503,7 +531,7 @@ jobs:
     name: Test flakyness
     runs-on: ubuntu-latest
     container:
-      image: ${{ needs.params.outputs.fail_test_image_name }}:${{ fromJson(needs.params.outputs.pg17_version).full }}${{ needs.params.outputs.image_suffix }}
+      image: ${{ needs.params.outputs.fail_test_image_name }}:${{ fromJson(needs.params.outputs.pg18_version).full }}${{ needs.params.outputs.image_suffix }}
       options: --user root
     env:
       runs: 8
diff --git a/.github/workflows/packaging-test-pipelines.yml b/.github/workflows/packaging-test-pipelines.yml
index db0fd08ef..e6c379f7b 100644
--- a/.github/workflows/packaging-test-pipelines.yml
+++ b/.github/workflows/packaging-test-pipelines.yml
@@ -29,7 +29,7 @@ jobs:
           # Postgres versions are stored in .github/workflows/build_and_test.yml
           # file in json strings with major and full keys.
           # Below command extracts the versions and get the unique values.
-          pg_versions=$(cat .github/workflows/build_and_test.yml | grep -oE '"major": "[0-9]+", "full": "[0-9.]+"' | sed -E 's/"major": "([0-9]+)", "full": "([0-9.]+)"/\1/g' | sort | uniq | tr '\n', ',')
+          pg_versions=$(cat .github/workflows/build_and_test.yml | grep -oE '"major": "[0-9]+", "full": "[^"]+"' | sed -E 's/.*"major": "([0-9]+)".*/\1/' | sort -n | uniq | tr '\n' ',')
           pg_versions_array="[ ${pg_versions} ]"
           echo "Supported PG Versions: ${pg_versions_array}"
           # Below line is needed to set the output variable to be used in the next job
diff --git a/configure b/configure
index 8deed181e..e8464bdc8 100755
--- a/configure
+++ b/configure
@@ -2588,7 +2588,7 @@ fi
 if test "$with_pg_version_check" = no; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: building against PostgreSQL $version_num (skipped compatibility check)" >&5
 $as_echo "$as_me: building against PostgreSQL $version_num (skipped compatibility check)" >&6;}
-elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17'; then
+elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17' -a "$version_num" != '18'; then
    as_fn_error $? "Citus is not compatible with the detected PostgreSQL version ${version_num}." "$LINENO" 5
 else
    { $as_echo "$as_me:${as_lineno-$LINENO}: building against PostgreSQL $version_num" >&5
diff --git a/configure.ac b/configure.ac
index 137323c1a..8a7b9b23e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@ AC_SUBST(with_pg_version_check)
 
 if test "$with_pg_version_check" = no; then
     AC_MSG_NOTICE([building against PostgreSQL $version_num (skipped compatibility check)])
-elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17'; then
+elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17' -a  "$version_num" != '18'; then
    AC_MSG_ERROR([Citus is not compatible with the detected PostgreSQL version ${version_num}.])
 else
    AC_MSG_NOTICE([building against PostgreSQL $version_num])