diff --git a/desktop/.flowconfig b/desktop/.flowconfig
--- a/desktop/.flowconfig
+++ b/desktop/.flowconfig
@@ -14,9 +14,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/keyserver/.flowconfig b/keyserver/.flowconfig
--- a/keyserver/.flowconfig
+++ b/keyserver/.flowconfig
@@ -28,9 +28,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/landing/.flowconfig b/landing/.flowconfig
--- a/landing/.flowconfig
+++ b/landing/.flowconfig
@@ -16,9 +16,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/lib/.flowconfig b/lib/.flowconfig
--- a/lib/.flowconfig
+++ b/lib/.flowconfig
@@ -15,9 +15,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/native/.flowconfig b/native/.flowconfig
--- a/native/.flowconfig
+++ b/native/.flowconfig
@@ -58,9 +58,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/services/electron-update-server/.flowconfig b/services/electron-update-server/.flowconfig
--- a/services/electron-update-server/.flowconfig
+++ b/services/electron-update-server/.flowconfig
@@ -7,9 +7,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error
diff --git a/web/.flowconfig b/web/.flowconfig
--- a/web/.flowconfig
+++ b/web/.flowconfig
@@ -19,9 +19,9 @@
 sketchy-null-number=warn
 sketchy-null-mixed=warn
 sketchy-number=warn
-untyped-type-import=warn
-nonstrict-import=warn
-deprecated-type=warn
+untyped-type-import=error
+nonstrict-import=error
+deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
 unused-promise=error