diff --git a/core/go.mod b/core/go.mod
index 647b5f3ab..808363b4e 100644
--- a/core/go.mod
+++ b/core/go.mod
@@ -1,6 +1,8 @@
 module github.com/open-feature/flagd/core
 
-go 1.20
+go 1.21
+
+toolchain go1.21.5
 
 require (
 	buf.build/gen/go/open-feature/flagd/connectrpc/go v1.12.0-20231031123731-ac2ec0f39838.1
@@ -32,7 +34,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.21.0
 	go.uber.org/zap v1.26.0
 	golang.org/x/crypto v0.17.0
-	golang.org/x/exp v0.0.0-20231127185646-65229373498e
+	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b
 	golang.org/x/mod v0.14.0
 	golang.org/x/net v0.19.0
 	golang.org/x/sync v0.5.0
diff --git a/core/go.sum b/core/go.sum
index 390647be6..4fa81bf6c 100644
--- a/core/go.sum
+++ b/core/go.sum
@@ -769,6 +769,8 @@ golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EH
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
 golang.org/x/exp v0.0.0-20231127185646-65229373498e h1:Gvh4YaCaXNs6dKTlfgismwWZKyjVZXwOPfIyUaqU3No=
 golang.org/x/exp v0.0.0-20231127185646-65229373498e/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b h1:kLiC65FbiHWFAOu+lxwNPujcsl8VYyTYYEZnsOO1WK4=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=