diff --git a/docs/clients.md b/docs/clients.md
index 44b0c704..8bc7c929 100644
--- a/docs/clients.md
+++ b/docs/clients.md
@@ -77,7 +77,7 @@ Each row is one `required_providers` entry, read where it is written.
 | `tools/conformance/outscale/terraform` | `outscale/outscale` | `~> 1.7` | constraint: resolved fresh on each run, so the version that answered is not knowable here | yes |
 | `tools/conformance/outscale/terraform-doorway` | `outscale/outscale` | `~> 1.7` | constraint: resolved fresh on each run, so the version that answered is not knowable here | yes |
 | `tools/conformance/scaleway/terraform` | `scaleway/scaleway` | `2.83.0` | exact: the version that answered | yes |
-| `examples/stacks/exoscale` | `exoscale/exoscale` | `>= 0.71.0` | constraint: resolved fresh on each run, so the version that answered is not knowable here | yes |
+| `examples/stacks/exoscale` | `exoscale/exoscale` | `0.72.0` | exact: the version that answered | yes |
 | `examples/stacks/outscale` | `outscale/outscale` | `~> 1.7` | constraint: resolved fresh on each run, so the version that answered is not knowable here | yes |
 | `examples/stacks/outscale/modules/net` | `outscale/outscale` | `~> 1.7` | constraint: resolved fresh on each run, so the version that answered is not knowable here | yes |
 | `examples/stacks/scaleway` | `scaleway/scaleway` | `2.83.0` | exact: the version that answered | yes |
diff --git a/examples/stacks/exoscale/main.tf b/examples/stacks/exoscale/main.tf
index 04dd33fc..36c8fb37 100644
--- a/examples/stacks/exoscale/main.tf
+++ b/examples/stacks/exoscale/main.tf
@@ -33,9 +33,23 @@ terraform {
   required_providers {
     exoscale = {
       source = "exoscale/exoscale"
-      # Not decoration: below this the provider splits its calls between this
+      # Not decoration: below 0.71.0 the provider splits its calls between this
       # emulator and a paying account (#644, upstream #573).
-      version = ">= 0.71.0"
+      #
+      # Exact rather than `>= 0.71.0`, since 2026-09-14. The floor was right and
+      # the FLOATING part was an accident of writing it as a lower bound: the two
+      # registries do not index together, so on that day `>= 0.71.0` resolved to
+      # 0.72.0 under terraform and to 0.71.0 under opentofu — the two engines
+      # driving this one stack with two different providers, both reporting that
+      # it passed. Worse, the opentofu side then sat EXACTLY on the floor, with
+      # the 57-request excursion of #525 one publication away, and the margin
+      # held by a registry's indexing schedule rather than by anything here.
+      # Measured, and recorded in #778.
+      #
+      # 0.72.0 is above the floor and is what both registries serve. Moving it
+      # is now an act somebody performs and measures, which is the whole reason
+      # the Scaleway fixture is pinned exactly too (#257).
+      version = "0.72.0"
     }
   }
 }