diff --git a/.github/workflows/sims-045.yml b/.github/workflows/sims-045.yml
deleted file mode 100644
index 76a1c28f67..0000000000
--- a/.github/workflows/sims-045.yml
+++ /dev/null
@@ -1,145 +0,0 @@
-name: Sims release/0.45.x
-# Sims workflow runs multiple types of simulations (nondeterminism, import-export, after-import, multi-seed-short)
-# This workflow will run on all Pull Requests, if a .go, .mod or .sum file have been changed
-on:
-  schedule:
-    - cron: "0 0,12 * * *"
-  release:
-    types: [published]
-
-concurrency:
-  group: ci-${{ github.ref }}-sims-045
-  cancel-in-progress: true
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.45.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - run: make build
-
-  install-runsim:
-    permissions:
-      contents: none
-    runs-on: ubuntu-latest
-    needs: build
-    steps:
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: Install runsim
-        run: go install github.com/cosmos/tools/cmd/runsim@v1.0.0
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-
-  test-sim-import-export:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.45.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-import-export
-        run: |
-          make test-sim-import-export
-
-  test-sim-after-import:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.45.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-after-import
-        run: |
-          make test-sim-after-import
-
-  test-sim-multi-seed-short:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.45.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-multi-seed-short
-        run: |
-          make test-sim-multi-seed-short
-
-  sims-notify-success:
-    needs:
-      [test-sim-multi-seed-short, test-sim-after-import, test-sim-import-export]
-    runs-on: ubuntu-latest
-    if: ${{ success() }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Get previous workflow status
-        uses: ./.github/actions/last-workflow-status
-        id: last_status
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Notify Slack on success
-        if: ${{ steps.last_status.outputs.last_status == 'failure' }}
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.45.x
-          SLACK_ICON_EMOJI: ":white_check_mark:"
-          SLACK_COLOR: good
-          SLACK_MESSAGE: 0.45.x Sims are passing
-          SLACK_FOOTER: ""
-
-  sims-notify-failure:
-    permissions:
-      contents: none
-    needs:
-      [test-sim-multi-seed-short, test-sim-after-import, test-sim-import-export]
-    runs-on: ubuntu-latest
-    if: ${{ failure() }}
-    steps:
-      - name: Notify Slack on failure
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.45.x
-          SLACK_ICON_EMOJI: ":skull:"
-          SLACK_COLOR: danger
-          SLACK_MESSAGE: 0.45.x Sims are failing
-          SLACK_FOOTER: ""
diff --git a/.github/workflows/sims-046.yml b/.github/workflows/sims-046.yml
deleted file mode 100644
index 1ac1d24987..0000000000
--- a/.github/workflows/sims-046.yml
+++ /dev/null
@@ -1,145 +0,0 @@
-name: Sims release/0.46.x
-# Sims workflow runs multiple types of simulations (nondeterminism, import-export, after-import, multi-seed-short)
-# This workflow will run on all Pull Requests, if a .go, .mod or .sum file have been changed
-on:
-  schedule:
-    - cron: "0 0,12 * * *"
-  release:
-    types: [published]
-
-concurrency:
-  group: ci-${{ github.ref }}-sims-046
-  cancel-in-progress: true
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.46.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - run: make build
-
-  install-runsim:
-    permissions:
-      contents: none
-    runs-on: ubuntu-latest
-    needs: build
-    steps:
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: Install runsim
-        run: go install github.com/cosmos/tools/cmd/runsim@v1.0.0
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-
-  test-sim-import-export:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.46.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-import-export
-        run: |
-          make test-sim-import-export
-
-  test-sim-after-import:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.46.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-after-import
-        run: |
-          make test-sim-after-import
-
-  test-sim-multi-seed-short:
-    runs-on: ubuntu-latest
-    needs: [build, install-runsim]
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.46.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - uses: actions/cache@v4
-        with:
-          path: ~/go/bin
-          key: ${{ runner.os }}-go-runsim-binary
-      - name: test-sim-multi-seed-short
-        run: |
-          make test-sim-multi-seed-short
-
-  sims-notify-success:
-    needs:
-      [test-sim-multi-seed-short, test-sim-after-import, test-sim-import-export]
-    runs-on: ubuntu-latest
-    if: ${{ success() }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Get previous workflow status
-        uses: ./.github/actions/last-workflow-status
-        id: last_status
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Notify Slack on success
-        if: ${{ steps.last_status.outputs.last_status == 'failure' }}
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.46.x
-          SLACK_ICON_EMOJI: ":white_check_mark:"
-          SLACK_COLOR: good
-          SLACK_MESSAGE: 0.46.x Sims are passing
-          SLACK_FOOTER: ""
-
-  sims-notify-failure:
-    permissions:
-      contents: none
-    needs:
-      [test-sim-multi-seed-short, test-sim-after-import, test-sim-import-export]
-    runs-on: ubuntu-latest
-    if: ${{ failure() }}
-    steps:
-      - name: Notify Slack on failure
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.46.x
-          SLACK_ICON_EMOJI: ":skull:"
-          SLACK_COLOR: danger
-          SLACK_MESSAGE: 0.46.x Sims are failing
-          SLACK_FOOTER: ""
diff --git a/.github/workflows/sims-050.yml b/.github/workflows/sims-050.yml
index ae713bc1d9..716f6999e3 100644
--- a/.github/workflows/sims-050.yml
+++ b/.github/workflows/sims-050.yml
@@ -1,6 +1,9 @@
 name: Sims release/0.50.x
 # Sims workflow runs multiple types of simulations (nondeterminism, import-export, after-import, multi-seed-short)
 # This workflow will run on all Pull Requests, if a .go, .mod or .sum file have been changed
+
+# TODO - update to 53 once we have cut release
+
 on:
   schedule:
     - cron: "0 0,12 * * *"
diff --git a/.github/workflows/sims-053.yml b/.github/workflows/sims-053.yml
deleted file mode 100644
index ff9a6bce05..0000000000
--- a/.github/workflows/sims-053.yml
+++ /dev/null
@@ -1,146 +0,0 @@
-name: Sims release/0.53.x
-# Sims workflow runs multiple types of simulations (nondeterminism, import-export, after-import, multi-seed-short)
-# This workflow will run on all Pull Requests, if a .go, .mod or .sum file have been changed
-on:
-  schedule:
-    - cron: "0 0,12 * * *"
-  release:
-    types: [published]
-
-concurrency:
-  group: ci-${{ github.ref }}-sims-053
-  cancel-in-progress: true
-
-jobs:
-  build:
-    permissions:
-      contents: read # for actions/checkout to fetch code
-    runs-on: depot-ubuntu-22.04-16
-    if: "!contains(github.event.head_commit.message, 'skip-sims')"
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.53.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - run: make build
-
-  test-sim-import-export:
-    runs-on: depot-ubuntu-22.04-16
-    needs: [build]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.53.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: test-sim-import-export
-        run: |
-          make test-sim-import-export
-
-  test-sim-after-import:
-    runs-on: depot-ubuntu-22.04-16
-    needs: [build]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.53.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: test-sim-after-import
-        run: |
-          make test-sim-after-import
-
-  test-sim-deterministic:
-    runs-on: depot-ubuntu-22.04-16
-    needs: [build]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.53.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: test-sim-nondeterminism
-        run: |
-          make test-sim-nondeterminism
-
-  test-sim-multi-seed-short:
-    runs-on: depot-ubuntu-22.04-16
-    needs: [build]
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: "release/v0.53.x"
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23"
-          check-latest: true
-      - name: test-sim-multi-seed-short
-        run: |
-          make test-sim-multi-seed-short
-
-  sims-notify-success:
-    needs:
-      [
-        test-sim-multi-seed-short,
-        test-sim-after-import,
-        test-sim-import-export,
-        test-sim-deterministic,
-      ]
-    runs-on: depot-ubuntu-22.04-16
-    if: ${{ success() }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Get previous workflow status
-        uses: ./.github/actions/last-workflow-status
-        id: last_status
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Notify Slack on success
-        if: ${{ steps.last_status.outputs.last_status == 'failure' }}
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.53.x
-          SLACK_ICON_EMOJI: ":white_check_mark:"
-          SLACK_COLOR: good
-          SLACK_MESSAGE: 0.53.x Sims are passing
-          SLACK_FOOTER: ""
-
-  sims-notify-failure:
-    permissions:
-      contents: none
-    needs:
-      [
-        test-sim-multi-seed-short,
-        test-sim-after-import,
-        test-sim-import-export,
-        test-sim-deterministic,
-      ]
-    runs-on: depot-ubuntu-22.04-16
-    if: ${{ failure() }}
-    steps:
-      - name: Notify Slack on failure
-        uses: rtCamp/action-slack-notify@v2.3.3
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_CHANNEL: sdk-sims
-          SLACK_USERNAME: Sim Tests release/0.53.x
-          SLACK_ICON_EMOJI: ":skull:"
-          SLACK_COLOR: danger
-          SLACK_MESSAGE: 0.53.x Sims are failing
-          SLACK_FOOTER: ""
diff --git a/.github/workflows/sims-nightly.yml b/.github/workflows/sims-nightly.yml
index 8d4a7e51c9..abd4ed4328 100644
--- a/.github/workflows/sims-nightly.yml
+++ b/.github/workflows/sims-nightly.yml
@@ -29,8 +29,23 @@ jobs:
         run: |
           make test-sim-multi-seed-long
 
+  test-sim-import-export:
+    runs-on: depot-ubuntu-22.04-4
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
+          check-latest: true
+      - name: test-sim-import-export
+        env:
+          GOMEMLIMIT: 14GiB # reserve 2 GiB as buffer for GC to avoid OOM
+        run: |
+          make test-sim-import-export
+
   sims-notify-success:
-    needs: [test-sim-multi-seed-long]
+    needs: [test-sim-multi-seed-long, test-sim-import-export]
     runs-on: depot-ubuntu-22.04-4
     if: ${{ success() }}
     steps: