diff --git a/doc/release_notes.md b/doc/release_notes.md
index 79c6bf77cc..463362cf74 100644
--- a/doc/release_notes.md
+++ b/doc/release_notes.md
@@ -31,6 +31,8 @@
 
 **Bugfixes and Compatibility**
 
+* Add explicit `cachetools` package dependency to avoid an import error on Windows installs ([#774](https://github.com/open-energy-transition/open-tyndp/pull/774)).
+
 **Documentation**
 
 * Update benchmarking documentation tables and figures for v0.7.1 ([#711](https://github.com/open-energy-transition/open-tyndp/pull/711)).
diff --git a/pixi.lock b/pixi.lock
index a572214cf9..fa8a8e04a9 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -7645,6 +7645,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.6.17-h4c7d964_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/cached-property-1.5.2-hd8ed1ab_1.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/noarch/cached_property-1.5.2-pyha770c72_1.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/noarch/cachetools-7.1.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/cattrs-26.1.0-pyhcf101f3_1.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/cdsapi-0.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2026.6.17-pyhd8ed1ab_0.conda
@@ -19559,6 +19560,16 @@ packages:
   run_exports: {}
   size: 11065
   timestamp: 1615209567874
+- conda: https://conda.anaconda.org/conda-forge/noarch/cachetools-7.1.4-pyhd8ed1ab_0.conda
+  sha256: de5e4deaa31b748502339ed2d725233af94f6db2fe1b414608bcb34581e8dd6b
+  md5: fbaa0445bcf8ba9e808c90cbc1235090
+  depends:
+  - python >=3.10
+  license: MIT
+  license_family: MIT
+  run_exports: {}
+  size: 21271
+  timestamp: 1779411598647
 - conda: https://conda.anaconda.org/conda-forge/noarch/cattrs-26.1.0-pyhcf101f3_1.conda
   sha256: c3c5772e8f3c9080b3b89765bb9e9d88972792b54d96d546c29672965bbb8d6c
   md5: eb57a77657c275d8d0b3542b070f484c
diff --git a/pixi.toml b/pixi.toml
index 3080c56d2e..5cee615577 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -244,6 +244,7 @@ python-calamine = ">=0.6.1"
 
 [feature.open-tyndp.target.win-64.dependencies]
 git = ">=2.52.0"
+cachetools = ">=5"
 
 [environments]
 doc = { features = ["doc"], no-default-feature = true }