diff --git a/certbot-nginx/local-oldest-requirements.txt b/certbot-nginx/local-oldest-requirements.txt
index e70ac0c7f..38ed5debe 100644
--- a/certbot-nginx/local-oldest-requirements.txt
+++ b/certbot-nginx/local-oldest-requirements.txt
@@ -1,2 +1,2 @@
-acme[dev]==0.25.0
+acme[dev]==0.26.0
 -e .[dev]
diff --git a/certbot-nginx/setup.py b/certbot-nginx/setup.py
index 4706f17bd..02aaa6581 100644
--- a/certbot-nginx/setup.py
+++ b/certbot-nginx/setup.py
@@ -7,7 +7,7 @@ version = '0.27.0.dev0'
 # Remember to update local-oldest-requirements.txt when changing the minimum
 # acme/certbot version.
 install_requires = [
-    'acme>=0.25.0',
+    'acme>=0.26.0',
     'certbot>=0.22.0',
     'mock',
     'PyOpenSSL',
diff --git a/local-oldest-requirements.txt b/local-oldest-requirements.txt
index 1f449acae..03226fc84 100644
--- a/local-oldest-requirements.txt
+++ b/local-oldest-requirements.txt
@@ -1 +1 @@
-acme[dev]==0.25.0
+acme[dev]==0.26.0
diff --git a/setup.py b/setup.py
index fc87917fb..1827c4d42 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ version = meta['version']
 # specified here to avoid masking the more specific request requirements in
 # acme. See https://github.com/pypa/pip/issues/988 for more info.
 install_requires = [
-    'acme>=0.25.0',
+    'acme>=0.26.0',
     # We technically need ConfigArgParse 0.10.0 for Python 2.6 support, but
     # saying so here causes a runtime error against our temporary fork of 0.9.3
     # in which we added 2.6 support (see #2243), so we relax the requirement.