diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index 86660da8..7b9610e9 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -150,7 +150,7 @@ packages:
     - libflame
   fmt:
     require:
-    - '@10.2.1:10'
+    - '@11.2.0:11'
     - +shared cxxstd=20
   freetype:
     require:
@@ -515,7 +515,7 @@ packages:
     - +dev
   spdlog:
     require:
-    - '@1.14.1'
+    - '@1.15.2:'
   stow:
     require:
     - '@2.3.1:'
diff --git a/spack-packages.sh b/spack-packages.sh
index c23f86e7..6ce734b6 100644
--- a/spack-packages.sh
+++ b/spack-packages.sh
@@ -67,6 +67,8 @@ f201ecd5e5923b394d14f74bc220dea06b9ab28f
 d95db21e9c9fa6eab1a9e62e2ba56066f2f955a7
 9cf8ee9c28465568d0b8871f245c400470e74ec7
 78a6c5f0a2531a78be5c9dd9235cf92036d541f5
+be6546b82b43d82edba804f1e362a709809ba537
+f5742718da7bd1d078ddc8423011a82ef2e3c759
 ---
 ## Optional hash table with comma-separated file list
 read -r -d '' SPACKPACKAGES_CHERRYPICKS_FILES <<- \
@@ -138,3 +140,5 @@ read -r -d '' SPACKPACKAGES_CHERRYPICKS_FILES <<- \
 ## d95db21e9c9fa6eab1a9e62e2ba56066f2f955a7: root: add v6.38.00
 ## 9cf8ee9c28465568d0b8871f245c400470e74ec7: Deprecation removals: E-H
 ## 78a6c5f0a2531a78be5c9dd9235cf92036d541f5: edm4hep: Add latest tags and update dependencies
+## be6546b82b43d82edba804f1e362a709809ba537: gaudi: allow newer fmt for v39
+## f5742718da7bd1d078ddc8423011a82ef2e3c759: gaudi: workaround test-dependency bug with a when