diff --git a/html_image_url_extractor/__manifest__.py b/html_image_url_extractor/__manifest__.py
index a0aa45623..a857148b7 100644
--- a/html_image_url_extractor/__manifest__.py
+++ b/html_image_url_extractor/__manifest__.py
@@ -12,6 +12,5 @@
     "license": "AGPL-3",
     "application": False,
     "installable": True,
-    "external_dependencies": {"python": ["lxml"]},
     "depends": ["base"],
 }
diff --git a/html_text/__manifest__.py b/html_text/__manifest__.py
index 746e99635..f2ada4363 100644
--- a/html_text/__manifest__.py
+++ b/html_text/__manifest__.py
@@ -14,6 +14,5 @@
     "license": "AGPL-3",
     "application": False,
     "installable": True,
-    "external_dependencies": {"python": ["lxml"]},
     "depends": ["base"],
 }
diff --git a/letsencrypt/__manifest__.py b/letsencrypt/__manifest__.py
index 69e6d0f73..25173b794 100644
--- a/letsencrypt/__manifest__.py
+++ b/letsencrypt/__manifest__.py
@@ -17,7 +17,5 @@
     "demo": ["demo/ir_cron.xml"],
     "post_init_hook": "post_init_hook",
     "installable": True,
-    "external_dependencies": {
-        "python": ["acme<2.0.0", "cryptography", "dnspython", "josepy"]
-    },
+    "external_dependencies": {"python": ["acme<2.0.0", "dnspython", "josepy"]},
 }
diff --git a/requirements.txt b/requirements.txt
index 039c3011d..dd70bcba9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,10 @@
 # generated from manifests external_dependencies
 acme<2.0.0
 astor
-cryptography
 cryptography==2.6.1
 dataclasses
 dnspython
 josepy
-lxml
 mako
 odoorpc
 openpyxl