Pulumi v3.261.0 release notes

Pulumi v3.261.0

v3.261.0Sep 2, 2026 · about 12 hours ago

Added 3

Support state migration callbacks on resource registrations
Add `pulumi env setup {aws,azure,gcp}` to configure cloud OIDC trust and create the ESC environments that use it
Add helper methods to transform ResourceOptions to InvokeOptions

Changed 4

Generate precise Python output types for discriminated unions
Resolve a union value to its member by matching the value's wire shape, so unions whose members carry no constant properties serialize and translate with the right member's property names
Accept a generated output type wherever the classes-and-dicts input types accept its Args class or TypedDict, so a resource's output can be passed to another resource's input without a type error
Send previously persisted outputs to a provider's Check on update, gated by a new sends_old_outputs_to_check handshake capability

Fixed 7

Report a clear error instead of panicking when the stack's state contains a custom resource with no ID
Show the agent account's claim URL instead of an inaccessible View Live link when running on ephemeral agent credentials
Fix a crash when binding a schema property with an integer constant value
Avoid hanging when policy pack fails to start up
Fix ProgramTest for providers whose Go module or NuGet package has a double-digit major version
Fix serialization of secret unknowns in NodeJS, Python and PCL
Ignore internal property keys (those starting with an underscore) when generating and checking update plans

From Pulumi

[engine] Support state migration callbacks on resource registrations #24328
[cli/env] Add pulumi env setup {aws,azure,gcp} to configure cloud OIDC trust and create the ESC environments that use it #23911

[engine] Report a clear error instead of panicking when the stack's state contains a custom resource with no ID #24438
[cli] Show the agent account's claim URL instead of an inaccessible View Live link when running on ephemeral agent credentials #24476
[pcl] Fix a crash when binding a schema property with an integer constant value #24480
[cli/policy] Avoid hanging when policy pack fails to start up #24492
[pkg/testing] Fix ProgramTest for providers whose Go module or NuGet package has a double-digit major version #24499
[sdk] Fix serialization of secret unknowns in NodeJS, Python and PCL #24500
[engine] Ignore internal property keys (those starting with an underscore) when generating and checking update plans #24532

[sdkgen] Generate precise Python output types for discriminated unions. An array of a union was typed Sequence[Any] and a scalar union Any, while the matching getters on the generated Args classes were already typed #24485
[sdk/python] Resolve a union value to its member by matching the value's wire shape, so unions whose members carry no constant properties serialize and translate with the right member's property names #24484
[sdkgen/python] Accept a generated output type wherever the classes-and-dicts input types accept its Args class or TypedDict, so a resource's output can be passed to another resource's input without a type error #24507
[engine] Send previously persisted outputs to a provider's Check on update, gated by a new sends_old_outputs_to_check handshake capability #24524
[sdk/python] Add helper methods to transform ResourceOptions to InvokeOptions #24533

Pulumi v3.261.0