diff --git a/changes/37012-host-details-activity-upcoming-count b/changes/37012-host-details-activity-upcoming-count
new file mode 100644
index 00000000000..210b6c67072
--- /dev/null
+++ b/changes/37012-host-details-activity-upcoming-count
@@ -0,0 +1 @@
+- Fixed an issue where the upcoming activity count on the host details page was not updated after installing or uninstalling software.
diff --git a/frontend/pages/hosts/details/cards/HostSoftwareLibrary/HostSoftwareLibrary.tsx b/frontend/pages/hosts/details/cards/HostSoftwareLibrary/HostSoftwareLibrary.tsx
index 0e4ce215102..0a4edeaeb58 100644
--- a/frontend/pages/hosts/details/cards/HostSoftwareLibrary/HostSoftwareLibrary.tsx
+++ b/frontend/pages/hosts/details/cards/HostSoftwareLibrary/HostSoftwareLibrary.tsx
@@ -7,7 +7,7 @@ import React, {
   useEffect,
 } from "react";
 import { InjectedRouter } from "react-router";
-import { useQuery } from "react-query";
+import { useQuery, useQueryClient } from "react-query";
 import { AxiosError } from "axios";
 
 import hostAPI, {
@@ -139,6 +139,8 @@ const HostSoftwareLibrary = ({
     currentUser,
   } = useContext(AppContext);
 
+  const queryClient = useQueryClient();
+
   const isUnsupported = isAndroid(platform); // no Android software
   const isWindowsHost = platform === "windows";
   const isIPadOrIPhoneHost = isIPadOrIPhone(platform);
@@ -500,6 +502,9 @@ const HostSoftwareLibrary = ({
         if (isMountedRef.current) {
           onInstallOrUninstall();
         }
+        queryClient.invalidateQueries({
+          queryKey: [{ scope: "upcoming-activities" }],
+        });
 
         const message = () => {
           switch (true) {
@@ -524,7 +529,7 @@ const HostSoftwareLibrary = ({
         renderFlash("error", getInstallErrorMessage(e));
       }
     },
-    [id, renderFlash, onInstallOrUninstall, isHostOnline]
+    [id, renderFlash, onInstallOrUninstall, isHostOnline, queryClient]
   );
 
   const onClickUninstallAction = useCallback(
@@ -534,6 +539,9 @@ const HostSoftwareLibrary = ({
         if (isMountedRef.current) {
           onInstallOrUninstall();
         }
+        queryClient.invalidateQueries({
+          queryKey: [{ scope: "upcoming-activities" }],
+        });
         renderFlash(
           "success",
           <>
@@ -548,7 +556,7 @@ const HostSoftwareLibrary = ({
         renderFlash("error", getUninstallErrorMessage(e));
       }
     },
-    [id, renderFlash, onInstallOrUninstall, isHostOnline]
+    [id, renderFlash, onInstallOrUninstall, isHostOnline, queryClient]
   );
 
   const tableConfig = useMemo(() => {