diff --git a/notebooks/file_inference.ipynb b/notebooks/file_inference.ipynb
index 2169c664..9eba0afb 100644
--- a/notebooks/file_inference.ipynb
+++ b/notebooks/file_inference.ipynb
@@ -133,7 +133,7 @@
       "    - ${VIRTUAL_ENV}\n",
       "\n",
       "before_install:\n",
-      "  - curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python\n",
+      "  - curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -\n",
       "  - source $HOME/.poetry/env\n",
       "  - make doctor\n",
       "\n",
@@ -213,8 +213,8 @@
       "    - ${VIRTUAL_ENV}\n",
       "\n",
       "before_install:\n",
-      "  - curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py\n",
-      "    | python\n",
+      "  - curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py\n",
+      "    | python -\n",
       "  - source $HOME/.poetry/env\n",
       "  - make doctor\n",
       "install:\n",
@@ -258,7 +258,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/format_options.ipynb b/notebooks/format_options.ipynb
index 53aac6fe..8ca2fd6f 100644
--- a/notebooks/format_options.ipynb
+++ b/notebooks/format_options.ipynb
@@ -142,7 +142,6 @@
       "my_float = 1.23\n",
       "my_int = 42\n",
       "my_str = \"Hello, world!\"\n",
-      "\n",
       "[[my_list]]\n",
       "value = 1\n",
       "\n",
@@ -241,7 +240,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/generic_types.ipynb b/notebooks/generic_types.ipynb
index feb397ed..cbfec23c 100644
--- a/notebooks/generic_types.ipynb
+++ b/notebooks/generic_types.ipynb
@@ -87,7 +87,7 @@
     {
      "data": {
       "text/plain": [
-       "Dictish(contents=[<__main__.Pair object at 0x103c56070>, <__main__.Pair object at 0x103c56580>])"
+       "Dictish(contents=[<__main__.Pair object at 0x10f298e80>, <__main__.Pair object at 0x10f298790>])"
       ]
      },
      "execution_count": null,
@@ -141,7 +141,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/manager_api.ipynb b/notebooks/manager_api.ipynb
index 205c8e90..97aa250b 100644
--- a/notebooks/manager_api.ipynb
+++ b/notebooks/manager_api.ipynb
@@ -232,7 +232,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/mapper_api.ipynb b/notebooks/mapper_api.ipynb
index 6d5d6032..2489b2c7 100644
--- a/notebooks/mapper_api.ipynb
+++ b/notebooks/mapper_api.ipynb
@@ -309,7 +309,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/nested_dataclass.ipynb b/notebooks/nested_dataclass.ipynb
index 6b282099..66da0242 100644
--- a/notebooks/nested_dataclass.ipynb
+++ b/notebooks/nested_dataclass.ipynb
@@ -168,7 +168,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/patched_containers.ipynb b/notebooks/patched_containers.ipynb
index 39f6103f..92371bc0 100644
--- a/notebooks/patched_containers.ipynb
+++ b/notebooks/patched_containers.ipynb
@@ -312,7 +312,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/readme.ipynb b/notebooks/readme.ipynb
index 6c888099..2db9e911 100644
--- a/notebooks/readme.ipynb
+++ b/notebooks/readme.ipynb
@@ -213,7 +213,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/roundtrip_comments.ipynb b/notebooks/roundtrip_comments.ipynb
index 1179fbc9..54d5b3d8 100644
--- a/notebooks/roundtrip_comments.ipynb
+++ b/notebooks/roundtrip_comments.ipynb
@@ -209,7 +209,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0"
+   "version": "3.9.4"
   }
  },
  "nbformat": 4,
diff --git a/poetry.lock b/poetry.lock
index 8148f22b..b18efd57 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1383,7 +1383,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "14516002fb4e38a9980998d09021fed99a9c6013c9c1dd4c5be7df0c9ea931e7"
+content-hash = "34fec111150d0259eb5b8529701f600d7c84fc40182c9729e9e33c16310ace80"
 
 [metadata.files]
 ansiwrap = [
diff --git a/pyproject.toml b/pyproject.toml
index 3f3a620f..6d42efd6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,12 +88,12 @@ coveragespace = "^4.0"
 # Documentation
 mkdocs = "~1.0"
 pygments = "^2.7.4"
-papermill = "*"
 
 # Notebooks
 ipython = "^7.4"
 jupyter = "^1.0"
-nbstripout ="*"
+nbstripout ="~0.3.9"
+papermill = "^2.2"
 
 [tool.black]