diff --git a/hledger-lib/package.yaml b/hledger-lib/package.yaml
index b20a37ae9..cb7131e39 100644
--- a/hledger-lib/package.yaml
+++ b/hledger-lib/package.yaml
@@ -64,7 +64,7 @@ dependencies:
 - file-embed >=0.0.10
 - filepath
 - hashtables >=1.2.3.1
-- megaparsec >=7.0.0 && <8.1
+- megaparsec >=7.0.0 && <9.1
 - mtl >=2.2.1
 - old-time
 - parsec >=3
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index aeceb9581..2cdece5ed 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -56,7 +56,7 @@ dependencies:
 - fsnotify >=0.2.1.2 && <0.4
 - microlens >=0.4
 - microlens-platform >=0.2.3.1
-- megaparsec >=7.0.0 && <8.1
+- megaparsec >=7.0.0 && <9.1
 - pretty-show >=1.6.4
 - process >=1.2
 - safe >=0.2
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index acf023fc4..7ad8a1ad7 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -122,7 +122,7 @@ library:
   - http-conduit
   - http-client
   - http-types
-  - megaparsec >=7.0.0 && <8.1
+  - megaparsec >=7.0.0 && <9.1
   - mtl >=2.2.1
   - network
   - semigroups
diff --git a/hledger/package.yaml b/hledger/package.yaml
index a92a844f0..a59fd74ac 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -122,7 +122,7 @@ dependencies:
 - extra >=1.6.3
 - filepath
 - haskeline >=0.6
-- megaparsec >=7.0.0 && <8.1
+- megaparsec >=7.0.0 && <9.1
 - mtl >=2.2.1
 - old-time
 - parsec >=3