diff --git a/sourcetool/go.mod b/sourcetool/go.mod
index 8ce938e7..2bab8d24 100644
--- a/sourcetool/go.mod
+++ b/sourcetool/go.mod
@@ -11,7 +11,7 @@ require (
 	github.com/sigstore/sigstore-go v0.7.0
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0
-	google.golang.org/protobuf v1.36.5
+	google.golang.org/protobuf v1.36.6
 )
 
 require (
diff --git a/sourcetool/go.sum b/sourcetool/go.sum
index e90259e1..1bbaf816 100644
--- a/sourcetool/go.sum
+++ b/sourcetool/go.sum
@@ -518,6 +518,8 @@ google.golang.org/grpc v1.70.0 h1:pWFv03aZoHzlRKHWicjsZytKAiYCtNS0dHbXnIdq7jQ=
 google.golang.org/grpc v1.70.0/go.mod h1:ofIJqVKDXx/JiXrwr2IG4/zwdH9txy3IlF40RmcJSQw=
 google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
 google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=