diff --git a/pavelib/prereqs.py b/pavelib/prereqs.py
index b0132c6577..d35cd7d9cc 100644
--- a/pavelib/prereqs.py
+++ b/pavelib/prereqs.py
@@ -200,6 +200,7 @@ PACKAGES_TO_UNINSTALL = [
     "edx-oauth2-provider",          # Because it moved from github to pypi
     "i18n-tools",                   # Because now it's called edx-i18n-tools
     "python-saml",                  # Because python3-saml shares the same directory name
+    "pdfminer",                     # Replaced by pdfminer.six, which shares the same directory name
 ]
 
 
diff --git a/requirements/edx/base.in b/requirements/edx/base.in
index 0aa4e7de47..72f8dddb68 100644
--- a/requirements/edx/base.in
+++ b/requirements/edx/base.in
@@ -105,7 +105,7 @@ mysqlclient                         # Driver for the default production relation
 newrelic                            # New Relic agent for performance monitoring
 nodeenv==1.1.1                      # Utility for managing Node.js environments; we use this for deployments and testing
 oauthlib                            # OAuth specification support for authenticating via LTI or other Open edX services
-pdfminer                            # Used in shoppingcart for extracting/parsing pdf text
+pdfminer.six                        # Used in shoppingcart for extracting/parsing pdf text
 piexif==1.0.2                       # Exif image metadata manipulation, used in the profile_images app
 Pillow                              # Image manipulation library; used for course assets, profile images, invoice PDFs, etc.
 py2neo<4.0.0                        # Used to communicate with Neo4j, which is used internally for modulestore inspection
@@ -121,7 +121,7 @@ pymongo                             # MongoDB driver
 pynliner                            # Inlines CSS styles into HTML for email notifications
 python-dateutil==2.4
 python-Levenshtein
-python3-openid ; python_version>='3' 
+python3-openid ; python_version>='3'
 python3-saml
 pyuca==1.1                          # For more accurate sorting of translated country names in django-countries
 reportlab                           # Used for shopping cart's pdf invoice/receipt generation
diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index 81aee64b11..f7bdb27832 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -177,7 +177,7 @@ path.py==8.2.1
 pathtools==0.1.2
 paver==1.3.4
 pbr==5.1.3
-pdfminer==20140328
+pdfminer.six==20181108
 piexif==1.0.2
 pillow==5.4.1
 pkgconfig==1.4.0          # via xmlsec
@@ -187,6 +187,7 @@ py2neo==3.1.2
 pycontracts==1.7.1
 pycountry==18.12.8
 pycparser==2.19
+pycryptodome==3.8.0       # via pdfminer.six
 pycryptodomex==3.4.7
 pygments==2.3.1
 pygraphviz==1.5
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index b5989de951..18767cc00a 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -234,7 +234,7 @@ pathlib2==2.3.3
 pathtools==0.1.2
 paver==1.3.4
 pbr==5.1.3
-pdfminer==20140328
+pdfminer.six==20181108
 piexif==1.0.2
 pillow==5.4.1
 pip-tools==3.5.0
@@ -250,6 +250,7 @@ pycodestyle==2.5.0
 pycontracts==1.7.1
 pycountry==18.12.8
 pycparser==2.19
+pycryptodome==3.8.0
 pycryptodomex==3.4.7
 pydispatcher==2.0.5
 pyflakes==2.1.1
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 6e5adad1e6..aaa726164f 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -227,7 +227,7 @@ pathlib2==2.3.3           # via pytest, pytest-django
 pathtools==0.1.2
 paver==1.3.4
 pbr==5.1.3
-pdfminer==20140328
+pdfminer.six==20181108
 piexif==1.0.2
 pillow==5.4.1
 pkgconfig==1.4.0
@@ -242,6 +242,7 @@ pycodestyle==2.5.0
 pycontracts==1.7.1
 pycountry==18.12.8
 pycparser==2.19
+pycryptodome==3.8.0
 pycryptodomex==3.4.7
 pydispatcher==2.0.5       # via scrapy
 pyflakes==2.1.1           # via flake8