diff --git a/.github/workflows/check-lint.yml b/.github/workflows/check-lint.yml
index 1adf883..b6803e5 100644
--- a/.github/workflows/check-lint.yml
+++ b/.github/workflows/check-lint.yml
@@ -29,7 +29,7 @@ jobs:
       #----------------------------------------------
       - name: Install poetry
         env:  # Keep in sync with `POETRY_VERSION` in `Dockerfile`
-          POETRY_VERSION: "1.2.0"
+          POETRY_VERSION: "1.3.1"
         run: |
           curl -sSL "https://install.python-poetry.org" | python -
           # Adding `poetry` to `$PATH`:
diff --git a/.github/workflows/poetry-test.yml b/.github/workflows/poetry-test.yml
index 50ea418..e2d53c0 100644
--- a/.github/workflows/poetry-test.yml
+++ b/.github/workflows/poetry-test.yml
@@ -29,7 +29,7 @@ jobs:
       #----------------------------------------------
       - name: Install poetry
         env:  # Keep in sync with `POETRY_VERSION` in `Dockerfile`
-          POETRY_VERSION: "1.2.0"
+          POETRY_VERSION: "1.3.1"
         run: |
           curl -sSL "https://install.python-poetry.org" | python -
           # Adding `poetry` to `$PATH`: