diff --git a/dev.in b/dev.in
index db4b64e..6b8ff0c 100644
--- a/dev.in
+++ b/dev.in
@@ -1,5 +1,5 @@
 bumpversion==0.5.3
-check-manifest==0.41
+check-manifest==0.48
 coverage==5.0.3
 pip-tools==4.5.1
 pytest-runner==5.2
diff --git a/dev.txt b/dev.txt
index 420468b..3b7553d 100644
--- a/dev.txt
+++ b/dev.txt
@@ -12,6 +12,8 @@ babel==2.8.0
     # via sphinx
 bleach==3.1.4
     # via readme-renderer
+build==0.7.0
+    # via check-manifest
 bumpversion==0.5.3
     # via -r dev.in
 certifi==2019.11.28
@@ -20,7 +22,7 @@ cffi==1.14.0
     # via cryptography
 chardet==3.0.4
     # via requests
-check-manifest==0.41
+check-manifest==0.48
     # via -r dev.in
 click==7.0
     # via pip-tools
@@ -56,13 +58,14 @@ more-itertools==8.2.0
     # via pytest
 packaging==20.1
     # via
+    #   build
     #   pytest
     #   sphinx
     #   tox
 pathtools==0.1.2
     # via watchdog
-pep517==0.8.1
-    # via check-manifest
+pep517==0.12.0
+    # via build
 pip-tools==4.5.1
     # via -r dev.in
 pkginfo==1.5.0.1
@@ -83,25 +86,25 @@ pygments==2.5.2
     #   sphinx
 pyparsing==2.4.6
     # via packaging
-pytest-runner==5.2
-    # via -r dev.in
-pytest-watch==4.2.0
-    # via -r dev.in
 pytest==5.3.5
     # via
     #   -r dev.in
     #   pytest-watch
+pytest-runner==5.2
+    # via -r dev.in
+pytest-watch==4.2.0
+    # via -r dev.in
 pytz==2019.3
     # via babel
 readme-renderer==24.0
     # via twine
-requests-toolbelt==0.9.1
-    # via twine
 requests==2.22.0
     # via
     #   requests-toolbelt
     #   sphinx
     #   twine
+requests-toolbelt==0.9.1
+    # via twine
 secretstorage==3.1.2
     # via keyring
 six==1.14.0
@@ -129,10 +132,12 @@ sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
     # via sphinx
 toml==0.10.0
+    # via tox
+tomli==2.0.1
     # via
+    #   build
     #   check-manifest
     #   pep517
-    #   tox
 tox==3.14.5
     # via -r dev.in
 tqdm==4.42.0