diff --git a/go.mod b/go.mod
index 1c5ca0483e2..ac22eddccbf 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/argoproj-labs/gitops-promoter v0.35.0
 	github.com/argoproj/argo-cd/gitops-engine v0.7.1-0.20250908182407-97ad5b59a627
 	github.com/argoproj/argo-cd/v3 v3.5.6
-	github.com/cert-manager/cert-manager v1.21.2
+	github.com/cert-manager/cert-manager v1.21.3
 	github.com/go-logr/logr v1.4.4
 	github.com/google/go-cmp v0.7.0
 	github.com/google/uuid v1.6.1-0.20241114170450-2d3c2a9cc518
diff --git a/go.sum b/go.sum
index e10762ca8ed..923416822f0 100644
--- a/go.sum
+++ b/go.sum
@@ -78,8 +78,8 @@ github.com/casbin/govaluate v1.10.0/go.mod h1:G/UnbIjZk/0uMNaLwZZmFQrR72tYRZWQkO
 github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
 github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cert-manager/cert-manager v1.21.2 h1:UWgoYM+KLNtRlqmoWOKjKBOBUPVHeepQ6/ac3ERJW68=
-github.com/cert-manager/cert-manager v1.21.2/go.mod h1:cUXqp2Ki46IovJB+XpkfaFNzitQDJjyfjrCAsl5Jnns=
+github.com/cert-manager/cert-manager v1.21.3 h1:s5xNJPfWSiBWLAxMmXw8runfcXMVVWM4kcMpZ1OODbY=
+github.com/cert-manager/cert-manager v1.21.3/go.mod h1:Y0beWPQTPpBNIdxwDX2EAL24ONep1H4jGOmSKPvoa0I=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=