diff --git a/.version b/.version
index d2ab029d3..23d4dd1a8 100644
--- a/.version
+++ b/.version
@@ -1 +1 @@
-1.21
+1.21.99
diff --git a/hledger-lib/.version b/hledger-lib/.version
index d2ab029d3..23d4dd1a8 100644
--- a/hledger-lib/.version
+++ b/hledger-lib/.version
@@ -1 +1 @@
-1.21
+1.21.99
diff --git a/hledger-lib/.version.m4 b/hledger-lib/.version.m4
index 6a2788149..5c9fbac96 100644
--- a/hledger-lib/.version.m4
+++ b/hledger-lib/.version.m4
@@ -1,2 +1,2 @@
 m4_dnl Version number to show in manuals. Updated by "Shake setversion"
-m4_define({{_version_}}, {{1.21}})m4_dnl
+m4_define({{_version_}}, {{1.21.99}})m4_dnl
diff --git a/hledger-lib/package.yaml b/hledger-lib/package.yaml
index 3a4d2b234..376ec8cdc 100644
--- a/hledger-lib/package.yaml
+++ b/hledger-lib/package.yaml
@@ -1,5 +1,5 @@
 name: hledger-lib
-version: 1.21
+version: 1.21.99
 synopsis: A reusable library providing the core functionality of hledger
 description: |
   A reusable library containing hledger's core functionality.
diff --git a/hledger-ui/.version b/hledger-ui/.version
index d2ab029d3..23d4dd1a8 100644
--- a/hledger-ui/.version
+++ b/hledger-ui/.version
@@ -1 +1 @@
-1.21
+1.21.99
diff --git a/hledger-ui/.version.m4 b/hledger-ui/.version.m4
index 6a2788149..5c9fbac96 100644
--- a/hledger-ui/.version.m4
+++ b/hledger-ui/.version.m4
@@ -1,2 +1,2 @@
 m4_dnl Version number to show in manuals. Updated by "Shake setversion"
-m4_define({{_version_}}, {{1.21}})m4_dnl
+m4_define({{_version_}}, {{1.21.99}})m4_dnl
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index c1f530a44..e6d3e4d6a 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -1,5 +1,5 @@
 name        : hledger-ui
-version     : 1.21
+version     : 1.21.99
 synopsis    : Curses-style terminal interface for the hledger accounting system
 description : |
   A simple curses-style terminal user interface for the hledger accounting system.
@@ -38,11 +38,11 @@ flags:
     manual: false
     default: true
 
-cpp-options: -DVERSION="1.21"
+cpp-options: -DVERSION="1.21.99"
 
 dependencies:
-- hledger-lib >=1.21 && <1.22
-- hledger >=1.21 && <1.22
+- hledger-lib >=1.21.99 && <1.22
+- hledger >=1.21.99 && <1.22
 - ansi-terminal >=0.9
 - async
 - base >=4.9 && <4.15
diff --git a/hledger-web/.version b/hledger-web/.version
index d2ab029d3..23d4dd1a8 100644
--- a/hledger-web/.version
+++ b/hledger-web/.version
@@ -1 +1 @@
-1.21
+1.21.99
diff --git a/hledger-web/.version.m4 b/hledger-web/.version.m4
index 6a2788149..5c9fbac96 100644
--- a/hledger-web/.version.m4
+++ b/hledger-web/.version.m4
@@ -1,2 +1,2 @@
 m4_dnl Version number to show in manuals. Updated by "Shake setversion"
-m4_define({{_version_}}, {{1.21}})m4_dnl
+m4_define({{_version_}}, {{1.21.99}})m4_dnl
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index 2474da3d0..897782b56 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -1,5 +1,5 @@
 name: hledger-web
-version: 1.21
+version: 1.21.99
 synopsis: Web-based user interface for the hledger accounting system
 description: |
   A simple web-based user interface for the hledger accounting system,
@@ -81,7 +81,7 @@ when:
 
 library:
   source-dirs: .
-  cpp-options: -DVERSION="1.21"
+  cpp-options: -DVERSION="1.21.99"
   exposed-modules:
   - Hledger.Web
   - Hledger.Web.Application
@@ -101,8 +101,8 @@ library:
   - Hledger.Web.Widget.AddForm
   - Hledger.Web.Widget.Common
   dependencies:
-  - hledger-lib >=1.21 && <1.22
-  - hledger >=1.21 && <1.22
+  - hledger-lib >=1.21.99 && <1.22
+  - hledger >=1.21.99 && <1.22
   - aeson >=1
   - base >=4.9 && <4.15
   - blaze-html
@@ -151,7 +151,7 @@ executables:
   hledger-web:
     source-dirs: app
     main: main.hs
-    cpp-options: -DVERSION="1.21"
+    cpp-options: -DVERSION="1.21.99"
     dependencies:
     - base
     - hledger-web
@@ -166,7 +166,7 @@ tests:
     source-dirs: test
     main: test.hs
     other-modules: []  # prevent double compilation, https://github.com/sol/hpack/issues/188
-    cpp-options: -DVERSION="1.21"
+    cpp-options: -DVERSION="1.21.99"
     dependencies:
     - base
     - hledger-lib
diff --git a/hledger/.version b/hledger/.version
index d2ab029d3..23d4dd1a8 100644
--- a/hledger/.version
+++ b/hledger/.version
@@ -1 +1 @@
-1.21
+1.21.99
diff --git a/hledger/.version.m4 b/hledger/.version.m4
index 6a2788149..5c9fbac96 100644
--- a/hledger/.version.m4
+++ b/hledger/.version.m4
@@ -1,2 +1,2 @@
 m4_dnl Version number to show in manuals. Updated by "Shake setversion"
-m4_define({{_version_}}, {{1.21}})m4_dnl
+m4_define({{_version_}}, {{1.21.99}})m4_dnl
diff --git a/hledger/package.yaml b/hledger/package.yaml
index 327285f7a..13f524619 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -1,5 +1,5 @@
 name: hledger
-version: 1.21
+version: 1.21.99
 synopsis: Command-line interface for the hledger accounting system
 description: |
   The command-line interface for the hledger accounting system.
@@ -95,7 +95,7 @@ ghc-options:
 - -optP-Wno-nonportable-include-path
 
 dependencies:
-- hledger-lib >=1.21 && <1.22
+- hledger-lib >=1.21.99 && <1.22
 - aeson >=1
 - ansi-terminal >=0.9
 - base >=4.9 && <4.15
@@ -136,7 +136,7 @@ when:
   - terminfo
 
 library:
-  cpp-options: -DVERSION="1.21"
+  cpp-options: -DVERSION="1.21.99"
   exposed-modules:
   - Hledger.Cli
   - Hledger.Cli.Main
@@ -187,7 +187,7 @@ executables:
   hledger:
     source-dirs: app
     main: hledger-cli.hs
-    cpp-options: -DVERSION="1.21"
+    cpp-options: -DVERSION="1.21.99"
     when:
     - condition: flag(threaded)
       ghc-options: -threaded
@@ -199,7 +199,7 @@ tests:
     source-dirs: test
     main: unittest.hs
     other-modules: []  # prevent double compilation, https://github.com/sol/hpack/issues/188
-    cpp-options: -DVERSION="1.21"
+    cpp-options: -DVERSION="1.21.99"
     dependencies:
     - hledger