diff --git a/poetry.lock b/poetry.lock
index b08d9c2..3106f5d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -425,18 +425,18 @@ python-versions = "*"
 
 [[package]]
 name = "jedi"
-version = "0.18.0"
+version = "0.17.2"
 description = "An autocompletion tool for Python that can be used for text editors."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-parso = ">=0.8.0,<0.9.0"
+parso = ">=0.7.0,<0.8.0"
 
 [package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["Django (<3.1)", "colorama", "docopt", "pytest (<6.0.0)"]
+qa = ["flake8 (==3.7.9)"]
+testing = ["Django (<3.1)", "colorama", "docopt", "pytest (>=3.9.0,<5.0.0)"]
 
 [[package]]
 name = "jinja2"
@@ -797,15 +797,14 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "parso"
-version = "0.8.1"
+version = "0.7.1"
 description = "A Python Parser"
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["docopt", "pytest (<6.0.0)"]
+testing = ["docopt", "pytest (>=3.0.7)"]
 
 [[package]]
 name = "pcodedmp"
@@ -1385,7 +1384,7 @@ virustotal = ["validators"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "16bf33b66ee9dc57dde5257b88038f0ca99a79312f57f2bce29f758b9b0720c1"
+content-hash = "0111246c147cf1b378686b6e839730cd8708babd1c1024509be97a5d29a1529e"
 
 [metadata.files]
 alabaster = [
@@ -1639,8 +1638,8 @@ ipython-genutils = [
     {file = "ipython_genutils-0.2.0.tar.gz", hash = "sha256:eb2e116e75ecef9d4d228fdc66af54269afa26ab4463042e33785b887c628ba8"},
 ]
 jedi = [
-    {file = "jedi-0.18.0-py2.py3-none-any.whl", hash = "sha256:18456d83f65f400ab0c2d3319e48520420ef43b23a086fdc05dff34132f0fb93"},
-    {file = "jedi-0.18.0.tar.gz", hash = "sha256:92550a404bad8afed881a137ec9a461fed49eca661414be45059329614ed0707"},
+    {file = "jedi-0.17.2-py2.py3-none-any.whl", hash = "sha256:98cc583fa0f2f8304968199b01b6b4b94f469a1f4a74c1560506ca2a211378b5"},
+    {file = "jedi-0.17.2.tar.gz", hash = "sha256:86ed7d9b750603e4ba582ea8edc678657fb4007894a12bcf6f4bb97892f31d20"},
 ]
 jinja2 = [
     {file = "Jinja2-2.11.2-py2.py3-none-any.whl", hash = "sha256:f0a4641d3cf955324a89c04f3d94663aa4d638abe8f733ecd3582848e1c37035"},
@@ -1799,8 +1798,8 @@ pandocfilters = [
     {file = "pandocfilters-1.4.3.tar.gz", hash = "sha256:bc63fbb50534b4b1f8ebe1860889289e8af94a23bff7445259592df25a3906eb"},
 ]
 parso = [
-    {file = "parso-0.8.1-py2.py3-none-any.whl", hash = "sha256:15b00182f472319383252c18d5913b69269590616c947747bc50bf4ac768f410"},
-    {file = "parso-0.8.1.tar.gz", hash = "sha256:8519430ad07087d4c997fda3a7918f7cfa27cb58972a8c89c2a0295a1c940e9e"},
+    {file = "parso-0.7.1-py2.py3-none-any.whl", hash = "sha256:97218d9159b2520ff45eb78028ba8b50d2bc61dcc062a9682666f2dc4bd331ea"},
+    {file = "parso-0.7.1.tar.gz", hash = "sha256:caba44724b994a8a5e086460bb212abc5a8bc46951bf4a9a1210745953622eb9"},
 ]
 pcodedmp = [
     {file = "pcodedmp-1.2.6-py2.py3-none-any.whl", hash = "sha256:4441f7c0ab4cbda27bd4668db3b14f36261d86e5059ce06c0828602cbe1c4278"},
diff --git a/pyproject.toml b/pyproject.toml
index 519548a..58318b3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,6 +78,8 @@ mypy = "^0.790"
 flake8 = "^3.8.4"
 ipython = "^7.16.1"
 jupyterlab = "^2.2.9"
+# jedi 0.18.0 breaks ipython
+jedi = "<0.18.0"
 
 [build-system]
 requires = ["poetry_core>=1.0", "setuptools"]