diff --git a/cmd/crongrep/go.mod b/cmd/crongrep/go.mod
index fa740d2..0939798 100644
--- a/cmd/crongrep/go.mod
+++ b/cmd/crongrep/go.mod
@@ -2,7 +2,7 @@ module github.com/winebarrel/cronplan/cmd/crongrep
 
 go 1.21
 
-toolchain go1.21.1
+toolchain go1.23.3
 
 replace github.com/winebarrel/cronplan => ../..
 
diff --git a/cmd/cronmatch/go.mod b/cmd/cronmatch/go.mod
index 73614cf..37771b1 100644
--- a/cmd/cronmatch/go.mod
+++ b/cmd/cronmatch/go.mod
@@ -2,7 +2,7 @@ module github.com/winebarrel/cronplan/cmd/cronmatch
 
 go 1.21
 
-toolchain go1.21.1
+toolchain go1.23.3
 
 replace github.com/winebarrel/cronplan => ../..
 
diff --git a/cmd/cronplan/go.mod b/cmd/cronplan/go.mod
index ce282da..d8229ea 100644
--- a/cmd/cronplan/go.mod
+++ b/cmd/cronplan/go.mod
@@ -2,7 +2,7 @@ module github.com/winebarrel/cronplan/cmd/cronplan
 
 go 1.21
 
-toolchain go1.21.1
+toolchain go1.23.3
 
 replace github.com/winebarrel/cronplan => ../..
 
diff --git a/cmd/cronviz/go.mod b/cmd/cronviz/go.mod
index 5691900..36b942a 100644
--- a/cmd/cronviz/go.mod
+++ b/cmd/cronviz/go.mod
@@ -2,7 +2,7 @@ module github.com/winebarrel/cronplan/cmd/cronviz
 
 go 1.21
 
-toolchain go1.21.1
+toolchain go1.23.3
 
 replace github.com/winebarrel/cronplan => ../..
 
diff --git a/go.mod b/go.mod
index a2e9694..99e4bc6 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,6 @@ module github.com/winebarrel/cronplan
 
 go 1.21
 
-toolchain go1.21.1
+toolchain go1.23.3
 
 require github.com/alecthomas/participle/v2 v2.1.1