diff --git a/config.go b/config.go
index eb68e596..1d155ba5 100644
--- a/config.go
+++ b/config.go
@@ -92,10 +92,12 @@ type TLS struct {
 func (c *Config) InitDefault() error {
 	const op = errors.Op("init_defaults_temporal")
 
-	if c.Activities != nil {
-		c.Activities.InitDefaults()
+	if c.Activities == nil {
+		c.Activities = &pool.Config{}
 	}
 
+	c.Activities.InitDefaults()
+
 	if c.CacheSize == 0 {
 		c.CacheSize = 10000
 	}
diff --git a/go.mod b/go.mod
index 151c46ea..2236877a 100644
--- a/go.mod
+++ b/go.mod
@@ -55,7 +55,7 @@ require (
 	golang.org/x/sys v0.2.0 // indirect
 	golang.org/x/text v0.4.0 // indirect
 	golang.org/x/time v0.2.0 // indirect
-	google.golang.org/genproto v0.0.0-20221109142239-94d6d90a7d66 // indirect
+	google.golang.org/genproto v0.0.0-20221118155620-16455021b5e6 // indirect
 	google.golang.org/grpc v1.51.0
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index bc88eb08..e3187415 100644
--- a/go.sum
+++ b/go.sum
@@ -1044,8 +1044,8 @@ google.golang.org/genproto v0.0.0-20221014213838-99cd37c6964a/go.mod h1:1vXfmgAz
 google.golang.org/genproto v0.0.0-20221024153911-1573dae28c9c/go.mod h1:9qHF0xnpdSfF6knlcsnpzUu5y+rpwgbvsyGAZPBMg4s=
 google.golang.org/genproto v0.0.0-20221024183307-1bc688fe9f3e/go.mod h1:9qHF0xnpdSfF6knlcsnpzUu5y+rpwgbvsyGAZPBMg4s=
 google.golang.org/genproto v0.0.0-20221027153422-115e99e71e1c/go.mod h1:CGI5F/G+E5bKwmfYo09AXuVN4dD894kIKUFmVbP2/Fo=
-google.golang.org/genproto v0.0.0-20221109142239-94d6d90a7d66 h1:wx7sJ5GRBQLRcslTNcrTklsHhHevQvxgztW18txbbZM=
-google.golang.org/genproto v0.0.0-20221109142239-94d6d90a7d66/go.mod h1:rZS5c/ZVYMaOGBfO68GWtjOw/eLaZM1X6iVtgjZ+EWg=
+google.golang.org/genproto v0.0.0-20221118155620-16455021b5e6 h1:a2S6M0+660BgMNl++4JPlcAO/CjkqYItDEZwkoDQK7c=
+google.golang.org/genproto v0.0.0-20221118155620-16455021b5e6/go.mod h1:rZS5c/ZVYMaOGBfO68GWtjOw/eLaZM1X6iVtgjZ+EWg=
 google.golang.org/grpc v1.12.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=