diff --git a/types/d3-hsv/d3-hsv-tests.ts b/types/d3-hsv/d3-hsv-tests.ts
index 780f584c7c..20cdd4f911 100644
--- a/types/d3-hsv/d3-hsv-tests.ts
+++ b/types/d3-hsv/d3-hsv-tests.ts
@@ -48,6 +48,7 @@ cHSV = cHSV.darker();
 cHSV = cHSV.darker(0.2);
 displayable = cHSV.displayable();
 cString = cHSV.toString();
+cString = cHSV.hex();
 console.log('Channels = (h : %d, s: %d, v: %d)', cHSV.h, cHSV.s, cHSV.v);
 console.log('Opacity = %d', cHSV.opacity);
 
diff --git a/types/d3-hsv/index.d.ts b/types/d3-hsv/index.d.ts
index 7452dbcc2b..1728af0874 100644
--- a/types/d3-hsv/index.d.ts
+++ b/types/d3-hsv/index.d.ts
@@ -68,12 +68,6 @@ export interface HSVColor extends Color {
      * Returns the RGB equivalent of this color.
      */
     rgb(): RGBColor;
-
-    /**
-     * Returns a hexadecimal string representing this color.
-     * If this color is not displayable, a suitable displayable color is returned instead. For example, RGB channel values greater than 255 are clamped to 255.
-     */
-    hex(): string;
 }
 
 export const hsv: HSVColorFactory;
diff --git a/types/d3-timer/index.d.ts b/types/d3-timer/index.d.ts
index 08fee97696..34bef32aba 100644
--- a/types/d3-timer/index.d.ts
+++ b/types/d3-timer/index.d.ts
@@ -3,7 +3,7 @@
 // Definitions by: Tom Wanzek <https://github.com/tomwanzek>, Alex Ford <https://github.com/gustavderdrache>, Boris Yankov <https://github.com/borisyankov>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-// Last module patch version validated against: 1.0.2
+// Last module patch version validated against: 1.0.7
 
 /**
  * Returns the current time as defined by performance.now if available, and Date.now if not.
@@ -44,7 +44,7 @@ export interface Timer {
 export function timer(callback: (elapsed: number) => void, delay?: number, time?: number): Timer;
 
 /**
- * Immediately invoke any eligible timer callbacks
+ * Immediately invoke any eligible timer callbacks.
  */
 export function timerFlush(): void;
 
diff --git a/types/d3-timer/tsconfig.json b/types/d3-timer/tsconfig.json
index f3af0c7d8e..91aaaf2092 100644
--- a/types/d3-timer/tsconfig.json
+++ b/types/d3-timer/tsconfig.json
@@ -7,7 +7,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
         "typeRoots": [