diff --git a/.circleci/config.pkl b/.circleci/config.pkl
index 0a299a1e..bb8e1cb9 100644
--- a/.circleci/config.pkl
+++ b/.circleci/config.pkl
@@ -14,7 +14,7 @@
 // limitations under the License.
 //===----------------------------------------------------------------------===// 
 // File gets rendered to .circleci/config.yml via git hook.
-amends "package://pkg.pkl-lang.org/pkl-project-commons/pkl.impl.circleci@1.2.0#/PklCI.pkl"
+amends "package://pkg.pkl-lang.org/pkl-project-commons/pkl.impl.circleci@1.2.1#/PklCI.pkl"
 
 import "jobs/BuildNativeJob.pkl"
 import "jobs/DeployJob.pkl"
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3522e0f6..719d9e0a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -34,9 +34,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-cli-linux-amd64-release:
     steps:
     - checkout
@@ -142,9 +142,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-cli-linux-aarch64-release:
     steps:
     - checkout
@@ -347,9 +347,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-doc-linux-amd64-release:
     steps:
     - checkout
@@ -455,9 +455,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-doc-linux-aarch64-release:
     steps:
     - checkout
@@ -660,9 +660,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-cli-linux-amd64-snapshot:
     steps:
     - checkout
@@ -768,9 +768,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-cli-linux-aarch64-snapshot:
     steps:
     - checkout
@@ -973,9 +973,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-doc-linux-amd64-snapshot:
     steps:
     - checkout
@@ -1081,9 +1081,9 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: m2pro.large
+    resource_class: m4pro.large
     macos:
-      xcode: 15.3.0
+      xcode: 26.0.1
   pkl-doc-linux-aarch64-snapshot:
     steps:
     - checkout
diff --git a/.circleci/jobs/BuildNativeJob.pkl b/.circleci/jobs/BuildNativeJob.pkl
index 83a7ff4c..2c52813d 100644
--- a/.circleci/jobs/BuildNativeJob.pkl
+++ b/.circleci/jobs/BuildNativeJob.pkl
@@ -16,7 +16,7 @@
 /// Builds the native `pkl` CLI
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.7.0#/Config.pkl"
 
 /// The architecture to use
 arch: "amd64" | "aarch64"
@@ -172,9 +172,9 @@ steps {
 job {
   when (os == "macOS") {
     macos {
-      xcode = "15.3.0"
+      xcode = "26.0.1"
     }
-    resource_class = "m2pro.large"
+    resource_class = "m4pro.large"
     environment {
       ["JAVA_HOME"] = "/Users/distiller/jdk/Contents/Home"
     }
diff --git a/.circleci/jobs/DeployJob.pkl b/.circleci/jobs/DeployJob.pkl
index d0b560a2..f2a5b853 100644
--- a/.circleci/jobs/DeployJob.pkl
+++ b/.circleci/jobs/DeployJob.pkl
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.7.0#/Config.pkl"
 
 local self = this
 
diff --git a/.circleci/jobs/GradleCheckJob.pkl b/.circleci/jobs/GradleCheckJob.pkl
index dc074491..7f89e4dd 100644
--- a/.circleci/jobs/GradleCheckJob.pkl
+++ b/.circleci/jobs/GradleCheckJob.pkl
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.7.0#/Config.pkl"
 
 steps {
   new Config.RunStep {
diff --git a/.circleci/jobs/GradleJob.pkl b/.circleci/jobs/GradleJob.pkl
index d39c391b..c210c3f7 100644
--- a/.circleci/jobs/GradleJob.pkl
+++ b/.circleci/jobs/GradleJob.pkl
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 abstract module GradleJob
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.7.0#/Config.pkl"
 import "package://pkg.pkl-lang.org/pkl-pantry/pkl.experimental.uri@1.0.3#/URI.pkl"
 
 /// Whether this is a release build or not.
diff --git a/.circleci/jobs/SimpleGradleJob.pkl b/.circleci/jobs/SimpleGradleJob.pkl
index 37507473..a695d3b2 100644
--- a/.circleci/jobs/SimpleGradleJob.pkl
+++ b/.circleci/jobs/SimpleGradleJob.pkl
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.7.0#/Config.pkl"
 
 name: String = command