diff --git a/src/mods/LauncherMods.lua b/src/mods/LauncherMods.lua
index 87e51acb..10922dea 100644
--- a/src/mods/LauncherMods.lua
+++ b/src/mods/LauncherMods.lua
@@ -215,12 +215,19 @@ function LauncherMods.checkDependencies(manifest, options, version, installedMan
     return m and not m.experimental
   end
 
+  local function conflictApplies(spec, other)
+    return not spec.range or (other and other.version
+      and Semver.satisfies(other.version, spec.range))
+  end
+
   -- (a) Conflicts declared by target manifest
   if type(manifest.conflictSpecs) == "table" then
     for _, spec in ipairs(manifest.conflictSpecs) do
       local conflictId = spec.id
       local installedOther = installedMap[conflictId]
-      if installedOther and isEnabled(conflictId) and not conflictIdsSeen[conflictId] then
+      if installedOther and isEnabled(conflictId)
+          and conflictApplies(spec, installedOther)
+          and not conflictIdsSeen[conflictId] then
         conflictIdsSeen[conflictId] = true
         hasIssues = true
         depsResult[#depsResult + 1] = {
@@ -238,11 +245,12 @@ function LauncherMods.checkDependencies(manifest, options, version, installedMan
 
   -- (b) Reverse conflicts declared by installed mods against target manifest
   if manifest.id then
+    local installedTarget = installedMap[manifest.id] or manifest
     for _, other in ipairs(manifests) do
       if other.id ~= manifest.id and isEnabled(other.id) and not conflictIdsSeen[other.id] then
         local conflicts = other.conflictSpecs or {}
         for _, spec in ipairs(conflicts) do
-          if spec.id == manifest.id then
+          if spec.id == manifest.id and conflictApplies(spec, installedTarget) then
             conflictIdsSeen[other.id] = true
             hasIssues = true
             depsResult[#depsResult + 1] = {
diff --git a/tests/mod_manifest_tests.lua b/tests/mod_manifest_tests.lua
index f7d1061d..7d7edae3 100644
--- a/tests/mod_manifest_tests.lua
+++ b/tests/mod_manifest_tests.lua
@@ -550,6 +550,51 @@ local installedColorlib = Manifest.validate({
   version = "1.0.0",
   entry = "main.lua",
 }, "mods/colorlib")
+local unconditionalConflict = LauncherMods.checkDependencies(testTargetManifest,
+  nil, nil, { testTargetManifest, installedColorlib })
+check(unconditionalConflict.hasIssues == true,
+  "dependency resolver reports an unversioned conflict")
+
+local function rangeTarget(version, conflicts)
+  return Manifest.validate({
+    id = "range_target",
+    name = "Range Target",
+    version = version,
+    entry = "main.lua",
+    conflicts = conflicts or {},
+  }, "mods/range_target")
+end
+local function rangeSource(conflicts)
+  return Manifest.validate({
+    id = "range_source",
+    name = "Range Source",
+    version = "1.0.0",
+    entry = "main.lua",
+    conflicts = conflicts or {},
+  }, "mods/range_source")
+end
+
+local forwardSource = rangeSource({ "range_target@<2.0.0" })
+local matchingTarget = rangeTarget("1.4.0")
+local nonmatchingTarget = rangeTarget("2.0.0")
+local forwardMatching = LauncherMods.checkDependencies(forwardSource,
+  nil, nil, { forwardSource, matchingTarget })
+check(forwardMatching.hasIssues == true and #forwardMatching.deps == 1,
+  "dependency resolver applies a matching forward conflict range")
+local forwardNonmatching = LauncherMods.checkDependencies(forwardSource,
+  nil, nil, { forwardSource, nonmatchingTarget })
+check(forwardNonmatching.hasIssues == false and #forwardNonmatching.deps == 0,
+  "dependency resolver ignores a nonmatching forward conflict range")
+
+local reverseSource = rangeSource({ "range_target@<2.0.0" })
+local reverseMatching = LauncherMods.checkDependencies(matchingTarget,
+  nil, nil, { reverseSource, matchingTarget })
+check(reverseMatching.hasIssues == true and #reverseMatching.deps == 1,
+  "dependency resolver applies a matching reverse conflict range")
+local reverseNonmatching = LauncherMods.checkDependencies(nonmatchingTarget,
+  nil, nil, { reverseSource, nonmatchingTarget })
+check(reverseNonmatching.hasIssues == false and #reverseNonmatching.deps == 0,
+  "dependency resolver ignores a nonmatching reverse conflict range")
 -- ------- scoped dependency tests
 local Json = require("src.link.Json")
 local scopedDepManifest = Manifest.validate({