diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac9bb20326..157b42d358 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,9 +82,9 @@ set(OPENMSX_VERSION "1.6")
 set(OPENMSX_URL  "https://github.com/OpenRCT2/OpenMusic/releases/download/v${OPENMSX_VERSION}/openmusic.zip")
 set(OPENMSX_SHA1 "ba170fa6d777b309c15420f4b6eb3fa25082a9d1")
 
-set(REPLAYS_VERSION "0.0.87")
+set(REPLAYS_VERSION "0.0.89")
 set(REPLAYS_URL  "https://github.com/OpenRCT2/replays/releases/download/v${REPLAYS_VERSION}/replays.zip")
-set(REPLAYS_SHA1 "6061B53DE346BD853BB997E635AC7374B1A7D2F0")
+set(REPLAYS_SHA1 "089CB8EEA76A98028367FDDE72675E9309AB9036")
 
 option(FORCE32 "Force 32-bit build. It will add `-m32` to compiler flags.")
 option(WITH_TESTS "Build tests")
diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index 4b3f544237..c41e9826ad 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -2,6 +2,7 @@
 ------------------------------------------------------------------------
 - Feature: [#24468] [Plugin] Add awards to plugin API.
 - Feature: [#24702] [Plugin] Add bindings for missing cheats (forcedParkRating, ignoreRidePrice, makeAllDestructible).
+- Change: [#25967] Security guards now only walk slowly in crowded areas.
 - Fix: [#24598] Cannot load .park files that use official legacy footpaths by accident.
 
 0.4.24 (2025-07-05)
diff --git a/openrct2.deps.targets b/openrct2.deps.targets
index 9c2bb75b5f..8f428cde8d 100644
--- a/openrct2.deps.targets
+++ b/openrct2.deps.targets
@@ -224,8 +224,8 @@
     <OpenSFXSha1>b1b1f1b241d2cbff63a1889c4dc5a09bdf769bfb</OpenSFXSha1>
     <OpenMSXUrl>https://github.com/OpenRCT2/OpenMusic/releases/download/v1.6/openmusic.zip</OpenMSXUrl>
     <OpenMSXSha1>ba170fa6d777b309c15420f4b6eb3fa25082a9d1</OpenMSXSha1>
-    <ReplaysUrl>https://github.com/OpenRCT2/replays/releases/download/v0.0.87/replays.zip</ReplaysUrl>
-    <ReplaysSha1>6061B53DE346BD853BB997E635AC7374B1A7D2F0</ReplaysSha1>
+    <ReplaysUrl>https://github.com/OpenRCT2/replays/releases/download/v0.0.89/replays.zip</ReplaysUrl>
+    <ReplaysSha1>089CB8EEA76A98028367FDDE72675E9309AB9036</ReplaysSha1>
   </PropertyGroup>
   
   <!-- Unified Dependency Target -->
diff --git a/src/openrct2/entity/Staff.cpp b/src/openrct2/entity/Staff.cpp
index 2e81d1353e..faf690a9c1 100644
--- a/src/openrct2/entity/Staff.cpp
+++ b/src/openrct2/entity/Staff.cpp
@@ -889,7 +889,7 @@ void Staff::EntertainerUpdateNearbyPeeps() const
                     continue;
 
                 int16_t z_dist = std::abs(z - guest->z);
-                if (z_dist > 48)
+                if (z_dist > kTileRadius / 2)
                     continue;
 
                 int16_t x_dist = std::abs(x - guest->x);
@@ -1644,14 +1644,58 @@ bool Staff::UpdatePatrollingFindSweeping()
     return false;
 }
 
+bool Staff::SecurityGuardPathIsCrowded() const
+{
+    // Iterate over tiles within a 3-tile radius (96 units)
+    constexpr auto kTileRadius = 3;
+    constexpr auto kLookupRadius = kCoordsXYStep * kTileRadius;
+    constexpr auto kSecurityPathCrowdedThreshold = 20;
+
+    int16_t guestCount = 0;
+
+    for (int32_t tileX = x - kLookupRadius; tileX <= x + kLookupRadius; tileX += kCoordsXYStep)
+    {
+        for (int32_t tileY = y - kLookupRadius; tileY <= y + kLookupRadius; tileY += kCoordsXYStep)
+        {
+            for (auto* guest : EntityTileList<Guest>({ tileX, tileY }))
+            {
+                if (guest->x == kLocationNull)
+                    continue;
+
+                int16_t zDist = std::abs(z - guest->z);
+                if (zDist > kTileRadius / 2)
+                    continue;
+
+                int16_t xDist = std::abs(x - guest->x);
+                if (xDist > kLookupRadius)
+                    continue;
+
+                int16_t yDist = std::abs(y - guest->y);
+                if (yDist > kLookupRadius)
+                    continue;
+
+                if (!guest->IsActionWalking())
+                    continue;
+
+                guestCount++;
+                if (guestCount >= kSecurityPathCrowdedThreshold)
+                    return true;
+            }
+        }
+    }
+
+    return false;
+}
+
 void Staff::Tick128UpdateStaff()
 {
     if (AssignedStaffType != StaffType::Security)
         return;
 
-    PeepAnimationGroup newAnimationGroup = PeepAnimationGroup::Alternate;
-    if (State != PeepState::Patrolling)
-        newAnimationGroup = PeepAnimationGroup::Normal;
+    // Alternate between walking animations based on crowd size
+    auto newAnimationGroup = PeepAnimationGroup::Normal;
+    if (State == PeepState::Patrolling && SecurityGuardPathIsCrowded())
+        newAnimationGroup = PeepAnimationGroup::Alternate;
 
     if (AnimationGroup == newAnimationGroup)
         return;
@@ -1665,6 +1709,7 @@ void Staff::Tick128UpdateStaff()
     auto& objManager = GetContext()->GetObjectManager();
     auto* animObj = objManager.GetLoadedObject<PeepAnimationsObject>(AnimationObjectIndex);
 
+    // NB: security staff have two animations groups: one regular, and one slow-walking
     PeepFlags &= ~PEEP_FLAGS_SLOW_WALK;
     if (animObj->IsSlowWalking(newAnimationGroup))
     {
diff --git a/src/openrct2/entity/Staff.h b/src/openrct2/entity/Staff.h
index 301b9c51db..b9e7bd0c43 100644
--- a/src/openrct2/entity/Staff.h
+++ b/src/openrct2/entity/Staff.h
@@ -112,6 +112,7 @@ private:
     Direction HandymanDirectionRandSurface(uint8_t validDirections) const;
 
     void EntertainerUpdateNearbyPeeps() const;
+    bool SecurityGuardPathIsCrowded() const;
 
     uint8_t GetValidPatrolDirections(const CoordsXY& loc) const;
     Direction HandymanDirectionToNearestLitter() const;
diff --git a/src/openrct2/network/NetworkBase.cpp b/src/openrct2/network/NetworkBase.cpp
index bf50997b2a..3c971727ab 100644
--- a/src/openrct2/network/NetworkBase.cpp
+++ b/src/openrct2/network/NetworkBase.cpp
@@ -49,7 +49,7 @@ using namespace OpenRCT2;
 // It is used for making sure only compatible builds get connected, even within
 // single OpenRCT2 version.
 
-constexpr uint8_t kNetworkStreamVersion = 0;
+constexpr uint8_t kNetworkStreamVersion = 1;
 
 const std::string kNetworkStreamID = std::string(kOpenRCT2Version) + "-" + std::to_string(kNetworkStreamVersion);