diff --git a/eng/Version.Details.props b/eng/Version.Details.props
index 43bc8e6d8e0..59575046327 100644
--- a/eng/Version.Details.props
+++ b/eng/Version.Details.props
@@ -7,7 +7,8 @@ This file should be imported by eng/Versions.props
   <PropertyGroup>
     <!-- dotnet-arcade dependencies -->
     <MicrosoftDotNetArcadeSdkPackageVersion>10.0.0-beta.26371.2</MicrosoftDotNetArcadeSdkPackageVersion>
-    <!-- dotnet-msbuild dependencies -->
+    <!-- dotnet-msbuild dependencies. Pinned at 18.10.0-1.26370.18 (see eng/Version.Details.xml):
+         later 18.10.0-1.26371.x builds dropped net10.0 assets and are incompatible with our net10.0 target. -->
     <MicrosoftBuildPackageVersion>18.10.0-1.26370.18</MicrosoftBuildPackageVersion>
     <MicrosoftBuildFrameworkPackageVersion>18.10.0-1.26370.18</MicrosoftBuildFrameworkPackageVersion>
     <MicrosoftBuildTasksCorePackageVersion>18.10.0-1.26370.18</MicrosoftBuildTasksCorePackageVersion>
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index b00667f5028..414302e26e1 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -2,19 +2,23 @@
 <Dependencies>
   <Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="1358fe9202089df7bdb79282a191c9dbbb773a06" BarId="320196" />
   <ProductDependencies>
-    <Dependency Name="Microsoft.Build" Version="18.10.0-1.26370.18">
+    <!-- Pinned at 18.10.0-1.26370.18: the 18.10.0-1.26371.x MSBuild builds dropped their net10.0
+         assets (they ship net11.0 + net472 only), which is incompatible with this repo's net10.0
+         product target framework - fsc/fsi fail to load Microsoft.Build.* at runtime. Unpin once
+         the product moves to net11.0 or MSBuild restores net10.0 assets. -->
+    <Dependency Name="Microsoft.Build" Version="18.10.0-1.26370.18" Pinned="true">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>eae54023463db15e9a9081f35a959c9162797643</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Framework" Version="18.10.0-1.26370.18">
+    <Dependency Name="Microsoft.Build.Framework" Version="18.10.0-1.26370.18" Pinned="true">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>eae54023463db15e9a9081f35a959c9162797643</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Tasks.Core" Version="18.10.0-1.26370.18">
+    <Dependency Name="Microsoft.Build.Tasks.Core" Version="18.10.0-1.26370.18" Pinned="true">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>eae54023463db15e9a9081f35a959c9162797643</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Utilities.Core" Version="18.10.0-1.26370.18">
+    <Dependency Name="Microsoft.Build.Utilities.Core" Version="18.10.0-1.26370.18" Pinned="true">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>eae54023463db15e9a9081f35a959c9162797643</Sha>
     </Dependency>